Network Working Group L. Wang Internet-Draft Individual Intended status: Standards Track H. Ananthakrishnan Expires: May 4, 2016 Packet Design M. Chen Huawei A. Dass S. Kini Ericsson N. Bahadur Bracket Computing November 1, 2015 A YANG Data Model for Routing Information Base (RIB) draft-ietf-i2rs-rib-data-model-03 Abstract This document defines a YANG data model for Routing Information Base (RIB) that aligns with the I2RS RIB information model. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on May 4, 2016. Wang, et al. Expires May 4, 2016 [Page 1] Internet-Draft RIB DM November 2015 Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Definitions and Acronyms . . . . . . . . . . . . . . . . 3 1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 2. Model Structure . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. RIB Capability . . . . . . . . . . . . . . . . . . . . . 7 2.2. Routing Instance and Rib . . . . . . . . . . . . . . . . 7 2.3. Route . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4. Nexthop . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.5. RPC Operations . . . . . . . . . . . . . . . . . . . . . 13 2.6. Notifications . . . . . . . . . . . . . . . . . . . . . . 16 3. YANG Modules . . . . . . . . . . . . . . . . . . . . . . . . 17 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 59 5. Security Considerations . . . . . . . . . . . . . . . . . . . 59 6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 59 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 60 7.1. Normative References . . . . . . . . . . . . . . . . . . 60 7.2. Informative References . . . . . . . . . . . . . . . . . 60 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 60 1. Introduction The Interface to the Routing System (I2RS) [I-D.ietf-i2rs-architecture] provides read and write access to the information and state within the routing process that exists inside the routing elements, this is achieved via the protocol message exchange between I2RS clients and I2RS agents associated with the routing system. One of the functions of I2RS is to read and write data of Routing Information Base (RIB). [I-D.ietf-i2rs-usecase-reqs-summary] introduces a set of RIB use cases and the RIB information model is defined in [I-D.ietf-i2rs-rib-info-model]. Wang, et al. Expires May 4, 2016 [Page 2] Internet-Draft RIB DM November 2015 This document defines a YANG [RFC6020][RFC6991] data model for the RIB that satisfies the RIB use cases and aligns with the RIB information model. 1.1. Definitions and Acronyms RIB: Routing Information Base Information Model (IM): An abstract model of a conceptual domain, independent of a specific implementation or data representation. 1.2. Tree Diagrams A simplified graphical representation of the data model is used in this document. The meaning of the symbols in these diagrams is as follows: o Brackets "[" and "]" enclose list keys. o Abbreviations before data node names: "rw" means configuration (read-write) and "ro" state data (read-only). o Symbols after data node names: "?" means an optional node and "*" denotes a "list" and "leaf-list". o Parentheses enclose choice and case nodes, and case nodes are also marked with a colon (":"). o Ellipsis ("...") stands for contents of subtrees that are not shown. 2. Model Structure The following figure shows an overview of structure tree of the i2rs- rib module. To give a whole view of the structure tree, some details of the tree are omitted. The detail are introduced in the following sub-sections. module: ietf-i2rs-rib +--rw routing-instance +--rw name string +--rw interface-list* [name] | +--rw name if:interface-ref +--rw router-id? yang:dotted-quad +--rw lookup-limit? uint8 +--rw rib-list* [name] +--rw name string +--rw rib-family rib-family-def Wang, et al. Expires May 4, 2016 [Page 3] Internet-Draft RIB DM November 2015 +--rw ip-rpf-check? boolean +--rw route-list* [route-index] +--rw route-index uint64 +--rw match | +--rw (route-type)? | +--:(ipv4) | | ... | +--:(ipv6) | | ... | +--:(mpls-route) | | ... | +--:(mac-route) | | ... | +--:(interface-route) | ... +--rw nexthop | +--rw nexthop-id uint32 | +--rw sharing-flag boolean | +--rw (nexthop-type)? | +--:(nexthop-base) | | ... | +--:(nexthop-chain) {nexthop-chain}? | | ... | +--:(nexthop-replicates) {nexthop-replicates}? | | ... | +--:(nexthop-protection) {nexthop-protection}? | | ... | +--:(nexthop-load-balance) {nexthop-load-balance}? | ... +--rw route-statistic | ... +--rw route-attributes | ... +--rw route-vendor-attributes rpcs: +---x rib-add | +--ro input | | +--ro rib-name string | | +--ro rib-family rib-family-def | | +--ro ip-rpf-check? boolean | +--ro output | +--ro result boolean +---x rib-delete | +--ro input | | +--ro rib-name string | +--ro output | +--ro result boolean +---x route-add Wang, et al. Expires May 4, 2016 [Page 4] Internet-Draft RIB DM November 2015 | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-delete | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-update | +--ro input | | +--ro rib-name string | | +--ro (match-conditions)? | | +--:(match-route-prefix) | | | ... | | +--:(match-route-attributes) | | | ... | | +--:(match-route-vendor-attributes) {...vendor-attributes}? | | | ... | | +--:(match-nexthop) | | ... | +--ro output | +--ro result boolean +---x nh-add | +--ro input | | +--ro rib-name string | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | +--:(nexthop-base) | | | ... | | +--:(nexthop-chain) {nexthop-chain}? | | | ... | | +--:(nexthop-replicates) {nexthop-replicates}? | | | ... | | +--:(nexthop-protection) {nexthop-protection}? | | | ... | | +--:(nexthop-load-balance) {nexthop-load-balance}? | | ... | +--ro output | +--ro result boolean | +--ro nexthop-id uint32 Wang, et al. Expires May 4, 2016 [Page 5] Internet-Draft RIB DM November 2015 +---x nh-delete +--ro input | +--ro rib-name string | +--ro nexthop-id uint32 | +--ro sharing-flag boolean | +--ro (nexthop-type)? | +--:(nexthop-base) | | ... | +--:(nexthop-chain) {nexthop-chain}? | | ... | +--:(nexthop-replicates) {nexthop-replicates}? | | ... | +--:(nexthop-protection) {nexthop-protection}? | | ... | +--:(nexthop-load-balance) {nexthop-load-balance}? | ... +--ro output +--ro result boolean notifications: +---n nexthop-resolution-status-change | +--ro nexthop | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | +--:(nexthop-base) | | | ... | | +--:(nexthop-chain) {nexthop-chain}? | | | ... | | +--:(nexthop-replicates) {nexthop-replicates}? | | | ... | | +--:(nexthop-protection) {nexthop-protection}? | | | ... | | +--:(nexthop-load-balance) {nexthop-load-balance}? | | ... | +--ro nexthop-state nexthop-state-def +---n route-change +--ro rib-name string +--ro rib-family rib-family-def +--ro route-index uint64 +--ro match | +--ro (route-type)? | +--:(ipv4) | | ... | +--:(ipv6) | | ... | +--:(mpls-route) | | ... | +--:(mac-route) Wang, et al. Expires May 4, 2016 [Page 6] Internet-Draft RIB DM November 2015 | | ... | +--:(interface-route) | ... +--ro route-installed-state route-installed-state-def +--ro route-state route-state-def +--ro route-change-reason route-reason-def Figure 1: Overview of I2RS Rib Module Structure 2.1. RIB Capability RIB capability negotiation is very important because not all of the hardware will be able to support all kinds of nexthops and there should be a limitation on how many levels of lookup can be practically performed. Therefore, a RIB data model MUST specify a way for an external entity to learn about the functional capabilities of a network device. At the same time, nexthop chains can be used to specify multiple headers over a packet, before that particular packet is forwarded. Not every network device will be able to support all kinds of nexthop chains along with the arbitrary number of headers which are chained together. The RIB data model MUST provide a way to expose the nexthop chaining capability supported by a given network device. This module uses the feature and if-feature statements to achieve above capability negotiation. 2.2. Routing Instance and Rib A routing instance, in the context of the RIB information model, is a collection of RIBs, interfaces, and routing protocol parameters. A routing instance creates a logical slice of the router and can allow multiple different logical slices; across a set of routers; to communicate with each other. And the routing protocol parameters control the information available in the RIBs. More detail about routing instance can be found in Section 2.2 of [I-D.ietf-i2rs-rib-info-model]. As described in [I-D.ietf-i2rs-rib-info-model], there will be multiple routing instances for a router. At the same time, for a routing instance, there would be multiple RIBs as well. Therefore, this model uses "list" to express the RIBs. The structure tree is shown as following figure. Wang, et al. Expires May 4, 2016 [Page 7] Internet-Draft RIB DM November 2015 +--rw routing-instance +--rw name string +--rw interface-list* [name] | +--rw name if:interface-ref +--rw router-id? yang:dotted-quad +--rw lookup-limit? uint8 +--rw rib-list* [name] +--rw name string +--rw rib-family rib-family-def +--rw ip-rpf-check? boolean +--rw route-list* [route-index] ... (refer to Section 2.3) Figure 2: Routing Instance Stuture 2.3. Route A route is essentially a match condition and an action following that match. The match condition specifies the kind of route (e.g., IPv4, MPLS, MAC, Interface etc.) and the set of fields to match on. According to the definition in [I-D.ietf-i2rs-rib-info-model], a route MUST associate with the following attributes: o ROUTE_PREFERENCE: See Section 2.3 of [I-D.ietf-i2rs-rib-info-model]. o ACTIVE: Indicates whether a route is fully resolved and is a candidate for selection. o INSTALLED: Indicates whether the route got installed in the FIB. In addition, a route can associate with one or more optional route attributes(e.g., route-vendor-attributes). For a RIB, there will have a number of routes, so the routes are expressed as a list under the rib list. Wang, et al. Expires May 4, 2016 [Page 8] Internet-Draft RIB DM November 2015 +--rw route-list* [route-index] +--rw route-index uint64 +--rw match | +--rw (route-type)? | +--:(ipv4) | | +--rw ipv4 | | +--rw (ip-route-match-type)? | | +--:(dest-ipv4-address) | | | ... | | +--:(src-ipv4-address) | | | ... | | +--:(dest-src-ipv4-address) | | ... | +--:(ipv6) | | +--rw ipv6 | | +--rw (ip-route-match-type)? | | +--:(dest-ipv6-address) | | | ... | | +--:(src-ipv6-address) | | | ... | | +--:(dest-src-ipv6-address) | | ... | +--:(mpls-route) | | +--rw mpls-label uint32 | +--:(mac-route) | | +--rw mac-address uint32 | +--:(interface-route) | +--rw interface-identifier if:interface-ref +--rw nexthop | ...(refer to Section 2.4) Figure 3: Routes Structure 2.4. Nexthop A nexthop represents an object resulting from a route lookup. As illustrated in Section 2.4 of [I-D.ietf-i2rs-rib-info-model], to support various of use cases (e.g., load balance, protection, multicast or the combination of them), the nexthop is modelled as a multi-level structure and supports recursion. The first level of the nexthop includes the following four types: o Base: The "base" nexthop itself is a hierarchical structure, it is the base of all other nexthop types. The first level of the base nexthop includes special-nexthop and nexthop-chain. The nexthop- chain can have one or more nexthop chain members, each member is one of the four types (as listed below) of specific nexthop. Wang, et al. Expires May 4, 2016 [Page 9] Internet-Draft RIB DM November 2015 Other first level nexthop (e.g., load-balance, protection and replicate) will finally be iterated to a "base" nexthop. * nexthop-id * egress-interface * logical-tunnel * tunnel-encap o Load-balance: Designed for load-balance case where it normally will have multiple weighted nexthops. o Protection: Designed for protection scenario where it normally will have primary and standby nexthop. o Replicate: Designed for multiple destinations forwarding. The structure tree of nexthop is shown in the following figures. +--rw nexthop | +--rw nexthop-id uint32 | +--rw sharing-flag boolean | +--rw (nexthop-type)? | +--:(nexthop-base) | | ...(refer to Figure 5) | +--:(nexthop-chain) {nexthop-chain}? | | +--rw nexthop-chain | | +--rw nexthop-list* [nexthop-member-id] | | +--rw nexthop-member-id uint32 | +--:(nexthop-replicates) {nexthop-replicates}? | | +--rw nexthop-replicates | | +--rw nexthop-list* [nexthop-member-id] | | +--rw nexthop-member-id uint32 | +--:(nexthop-protection) {nexthop-protection}? | | +--rw nexthop-protection | | +--rw nexthop-list* [nexthop-member-id] | | +--rw nexthop-member-id uint32 | | +--rw nexthop-preference nexthop-preference-def | +--:(nexthop-load-balance) {nexthop-load-balance}? | +--rw nexthop-lbs | +--rw nexthop-list* [nexthop-member-id] | +--rw nexthop-member-id uint32 | +--rw nexthop-lb-weight nexthop-lb-weight-def Figure 4: Nexhop Structure Wang, et al. Expires May 4, 2016 [Page 10] Internet-Draft RIB DM November 2015 Figure 5 (as shown blow) is a sub-tree of nexthop, it's under the nexthop base node. +--:(nexthop-base) | +--rw nexthop-base | +--rw (nexthop-base-type)? | +--:(special-nexthop) | | +--rw special? special-nexthop-def | +--:(egress-interface-nexthop) | | +--rw outgoing-interface if:interface-ref | +--:(ipv4-address-nexthop) | | +--rw ipv4-address inet:ipv4-address | +--:(ipv6-address-nexthop) | | +--rw ipv6-address inet:ipv6-address | +--:(egress-interface-ipv4-nexthop) | | +--rw egress-interface-ipv4-address | | +--rw outgoing-interface if:interface-ref | | +--rw ipv4-address inet:ipv4-address | +--:(egress-interface-ipv6-nexthop) | | +--rw egress-interface-ipv6-address | | +--rw outgoing-interface if:interface-ref | | +--rw ipv6-address inet:ipv6-address | +--:(egress-interface-mac-nexthop) | | +--rw egress-interface-mac-address | | +--rw outgoing-interface if:interface-ref | | +--rw ieee-mac-address uint32 | +--:(tunnel-encap-nexthop) {nexthop-tunnel}? | | +--rw tunnel-encap | | +--rw (tunnel-type)? | | +--:(ipv4) {ipv4-tunnel}? | | | +--rw src-ipv4-address inet:ipv4-address | | | +--rw dest-ipv4-address inet:ipv4-address | | | +--rw protocol uint8 | | | +--rw ttl? uint8 | | | +--rw dscp? uint8 | | +--:(ipv6) {ipv6-tunnel}? | | | +--rw src-ipv6-address inet:ipv6-address | | | +--rw dest-ipv6-address inet:ipv6-address | | | +--rw next-header uint8 | | | +--rw traffic-class? uint8 | | | +--rw flow-label? uint16 | | | +--rw hop-limit? uint8 | | +--:(mpls) {mpls-tunnel}? | | | +--rw label-operations* [label-oper-id] | | | +--rw label-oper-id uint32 | | | +--rw (label-actions)? | | | +--:(label-push) | | | | +--rw label-push Wang, et al. Expires May 4, 2016 [Page 11] Internet-Draft RIB DM November 2015 | | | | +--rw label uint32 | | | | +--rw s-bit? boolean | | | | +--rw tc-value? uint8 | | | | +--rw ttl-value? uint8 | | | +--:(label-swap) | | | +--rw label-swap | | | +--rw in-label uint32 | | | +--rw out-label uint32 | | | +--rw ttl-action? ttl-action-def | | +--:(gre) {gre-tunnel}? | | | +--rw (dest-address-type)? | | | | +--:(ipv4) | | | | | +--rw ipv4-dest inet:ipv4-address | | | | +--:(ipv6) | | | | +--rw ipv6-dest inet:ipv6-address | | | +--rw protocol-type uint16 | | | +--rw key? uint64 | | +--:(nvgre) {nvgre-tunnel}? | | | +--rw (nvgre-type)? | | | | +--:(ipv4) | | | | | +--rw src-ipv4-address inet:ipv4-address | | | | | +--rw dest-ipv4-address inet:ipv4-address | | | | | +--rw protocol uint8 | | | | | +--rw ttl? uint8 | | | | | +--rw dscp? uint8 | | | | +--:(ipv6) | | | | +--rw src-ipv6-address inet:ipv6-address | | | | +--rw dest-ipv6-address inet:ipv6-address | | | | +--rw next-header uint8 | | | | +--rw traffic-class? uint8 | | | | +--rw flow-label? uint16 | | | | +--rw hop-limit? uint8 | | | +--rw virtual-subnet-id uint32 | | | +--rw flow-id? uint16 | | +--:(vxlan) {vxlan-tunnel}? | | +--rw (vxlan-type)? | | | +--:(ipv4) | | | | +--rw src-ipv4-address inet:ipv4-address | | | | +--rw dest-ipv4-address inet:ipv4-address | | | | +--rw protocol uint8 | | | | +--rw ttl? uint8 | | | | +--rw dscp? uint8 | | | +--:(ipv6) | | | +--rw src-ipv6-address inet:ipv6-address | | | +--rw dest-ipv6-address inet:ipv6-address | | | +--rw next-header uint8 | | | +--rw traffic-class? uint8 | | | +--rw flow-label? uint16 Wang, et al. Expires May 4, 2016 [Page 12] Internet-Draft RIB DM November 2015 | | | +--rw hop-limit? uint8 | | +--rw vxlan-identifier uint32 | +--:(tunnel-decap-nexthp) {nexthop-tunnel}? | | +--rw tunnel-decap | | +--rw (tunnel-type)? | | +--:(ipv4) {ipv4-tunnel}? | | | +--rw ipv4-decap | | | +--rw ipv4-decap tunnel-decap-action-def | | | +--rw ttl-action? ttl-action-def | | +--:(ipv6) {ipv6-tunnel}? | | | +--rw ipv6-decap | | | +--rw ipv6-decap tunnel-decap-action-def | | | +--rw hop-limit-action? hop-limit-action-def | | +--:(mpls) {mpls-tunnel}? | | +--rw label-pop | | +--rw label-pop mpls-label-action-def | | +--rw ttl-action? ttl-action-def | +--:(logical-tunnel-nexthop) {nexthop-tunnel}? | | +--rw logical-tunnel | | +--rw tunnel-type tunnel-type-def | | +--rw tunnel-name string | +--:(rib-name-nexthop) | +--rw rib-name? string Figure 5: Nexthop Base Structure 2.5. RPC Operations This module defines the following RPC operations: o rib-add: It is defined to add a rib to a routing instance. A name of the rib, address family of the rib and whether the RPF check is enabled are passed as the input parameters. The output is the result of the add operation: 1 means success, and 0 means failed. o rib-delete: It is defined to delete a rib from a routing instance. When a rib is deleted, all routes installed in the rib will be deleted. A name of the rib is passed as the input parameter. The output is the result of the delete operation: 1 means success, and 0 means failed. o route-add: It is defined to add a route or a set of routes to a rib. A rib name, the route prefix(es), route attributes, route vendor attributes and nexthop are passed as the input parameters. The output is the result of the add operation: 1 means success, and 0 means failed. Before calling the route-add rpc, it is required to call the nh-add rpc to create and/or return the nexthop identifier. Wang, et al. Expires May 4, 2016 [Page 13] Internet-Draft RIB DM November 2015 o route-delete: It is defined to delete a route or a set of routes from a rib. A name of the rib and the route prefix(es) are passed as the input parameters. The output is the result of the delete operation: 1 means success, and 0 means failed. o route-update: It is defined to update a route or a set of routes. A rib name, the route prefix(es), or route attributes, or route vendor attributes, or nexthop are passed as the input parameters. The match conditions can be either route prefix(es), or route attributes, or route vendor attributes, or nexthop. The update actions include: update the nexthop, update the route attributes, update the route vendor attributes. The output is the result of the update operation: 1 means success, and 0 means failed. o nh-add: It is defined to add a nexthop to a rib. A name of the rib and a nexthop are passed as the input parameters. The network node is required to allocate a nexhop identifier to the nexthop. The outputs include the result of the update operation (1 means success, and 0 means failed ) and the nexthop identifier that is allocated to the nexthop. o nh-delete: It is defined to delete a nexthop from a rib. A name of a rib and a nexthop or nexthop identifier are passed as the input parameters. The output is the result of the delete operation: 1 means success, 0 means failed. The structure tree of rpcs is showing in following figure. rpcs: +---x rib-add | +--ro input | | +--ro rib-name string | | +--ro rib-family rib-family-def | | +--ro ip-rpf-check? boolean | +--ro output | +--ro result boolean +---x rib-delete | +--ro input | | +--ro rib-name string | +--ro output | +--ro result boolean +---x route-add | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output Wang, et al. Expires May 4, 2016 [Page 14] Internet-Draft RIB DM November 2015 | +--ro result boolean +---x route-delete | +--ro input | | +--ro rib-name string | | +--ro routes | | +--ro route-list* [route-index] | | ... | +--ro output | +--ro result boolean +---x route-update | +--ro input | | +--ro rib-name string | | +--ro (match-conditions)? | | +--:(match-route-prefix) | | | ... | | +--:(match-route-attributes) | | | ... | | +--:(match-route-vendor-attributes) {..vendor-attributes}? | | | ... | | +--:(match-nexthop) | | ... | +--ro output | +--ro result boolean +---x nh-add | +--ro input | | +--ro rib-name string | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | ... | +--ro output | +--ro result boolean | +--ro nexthop-id uint32 +---x nh-delete +--ro input | +--ro rib-name string | +--ro nexthop-id uint32 | +--ro sharing-flag boolean | +--ro (nexthop-type)? | ... +--ro output +--ro result boolean Figure 6: RPCs Structure Wang, et al. Expires May 4, 2016 [Page 15] Internet-Draft RIB DM November 2015 2.6. Notifications Asynchronous notifications are sent by the RIB manager of a network device to an external entity when some event triggers on the network device. A RIB data-model MUST support sending 2 kind of asynchronous notifications. 1. Route change notification: o Installed (Indicates whether the route got installed in the FIB) ; o Active (Indicates whether a route is fully resolved and is a candidate for selection) ; o Reason - E.g. Not authorized 2. Nexthop resolution status notification Nexthops can be fully resolved nexthops or an unresolved nexthop. A resolved nexthop has adequate level of information to send the outgoing packet towards the destination by forwarding it on an interface of a directly connected neighbor. An unresolved nexthop is something that requires the RIB manager to determine the final resolved nexthop. For example, in a case when a nexthop could be an IP address. The RIB manager would resolve how to reach that IP address, e.g. by checking if that particular IP is address reachable by regular IP forwarding or by a MPLS tunnel or by both. If the RIB manager cannot resolve the nexthop, then the nexthop remains in an unresolved state and is NOT a suitable candidate for installation in the FIB. The structure tree of notifications is shown in the following figure. Wang, et al. Expires May 4, 2016 [Page 16] Internet-Draft RIB DM November 2015 notifications: +---n nexthop-resolution-status-change | +--ro nexthop | | +--ro nexthop-id uint32 | | +--ro sharing-flag boolean | | +--ro (nexthop-type)? | | +--:(nexthop-base) | | | ... | | +--:(nexthop-chain) {nexthop-chain}? | | | ... | | +--:(nexthop-replicates) {nexthop-replicates}? | | | ... | | +--:(nexthop-protection) {nexthop-protection}? | | | ... | | +--:(nexthop-load-balance) {nexthop-load-balance}? | | ... | +--ro nexthop-state nexthop-state-def +---n route-change +--ro rib-name string +--ro rib-family rib-family-def +--ro route-index uint64 +--ro match | +--ro (route-type)? | +--:(ipv4) | | ... | +--:(ipv6) | | ... | +--:(mpls-route) | | ... | +--:(mac-route) | | ... | +--:(interface-route) | ... +--ro route-installed-state route-installed-state-def +--ro route-state route-state-def +--ro route-change-reason route-reason-def Figure 7: Notifications Structure 3. YANG Modules // file "ietf i2rs rib@2015-10-28.yang" module ietf-i2rs-rib { namespace "urn:ietf:params:xml:ns:yang:ietf-i2rs-rib"; // replace with iana namespace when assigned prefix "iir"; Wang, et al. Expires May 4, 2016 [Page 17] Internet-Draft RIB DM November 2015 import ietf-inet-types { prefix inet; //rfc6991 } import ietf-interfaces { prefix "if"; } import ietf-yang-types { prefix yang; } organization "IETF I2RS (Interface to Routing System) Working Group"; contact "WG Web: WG List: WG Chair: Susan Hares WG Chair: Jeffrey Haas Editor: Lixing Wang Editor: Hariharan Ananthakrishnan Editor: Mach(Guoyi) Chen Editor: Amit Dass Editor: Sriganesh Kini Editor: Nitin Bahadur "; description "This module defines a YANG data model for Routing Information Base (RIB) that aligns with the I2RS RIB information model."; revision "2015-10-28" { description "initial revision"; Wang, et al. Expires May 4, 2016 [Page 18] Internet-Draft RIB DM November 2015 reference "draft-ietf-i2rs-rib-info-model-08"; } //Features feature nexthop-tunnel { description "This feature means that a node support tunnel nexhtop capability."; } feature nexthop-chain { description "This feature means that a node support chain nexhtop capability."; } feature nexthop-protection { description "This feature means that a node support protection nexhtop capability."; } feature nexthop-replicates { description "This feature means that a node support relicates nexhtop capability."; } feature nexthop-load-balance { description "This feature means that a node support load balance nexhtop capability."; } feature ipv4-tunnel { description "This feature means that a node support IPv4 tunnel encapsulation capability."; } feature ipv6-tunnel { description "This feature means that a node support IPv6 tunnel encapsulation capability."; } feature mpls-tunnel { description Wang, et al. Expires May 4, 2016 [Page 19] Internet-Draft RIB DM November 2015 "This feature means that a node support MPLS tunnel encapsulation capability."; } feature vxlan-tunnel { description "This feature means that a node support VxLAN tunnel encapsulation capability."; } feature gre-tunnel { description "This feature means that a node support GRE tunnel encapsulation capability."; } feature nvgre-tunnel { description "This feature means that a node support NvGRE tunnel encapsulation capability."; } feature route-vendor-attributes { description "This feature means that a node support route vendor attributes."; } //Identities and Type Definitions identity mpls-label-action { description "Base identify from which all mpls label operations are derived. The MPLS label stack operations include: push - to add a new label to a label stack, pop - to pop the top label from a label stack, swap - to change the top label of a label stack with new label."; } identity label-push { base "mpls-label-action"; description "MPLS label stack operation: push."; } identity label-pop { base "mpls-label-action"; Wang, et al. Expires May 4, 2016 [Page 20] Internet-Draft RIB DM November 2015 description "MPLS label stack operation: pop."; } identity label-swap { base "mpls-label-action"; description "MPLS label stack operation: swap."; } typedef mpls-label-action-def { type identityref { base "mpls-label-action"; } description "MPLS label action def."; } identity tunnel-decap-action { description "Base identify from which all tunnel decap actions are derived. Tunnel decap actions include: ipv4-decap - to decap an IPv4 tunnel, ipv6-decap - to decap an IPv6 tunnel."; } identity ipv4-decap { base "tunnel-decap-action"; description "IPv4 tunnel decap."; } identity ipv6-decap { base "tunnel-decap-action"; description "IPv4 tunnel decap."; } typedef tunnel-decap-action-def { type identityref { base "tunnel-decap-action"; } description "Tunnel decap def."; } identity ttl-action { Wang, et al. Expires May 4, 2016 [Page 21] Internet-Draft RIB DM November 2015 description "Base identify from which all TTL actions are derived. The tll actions include: - ttl-no-action: do nothing regarding the TTL, or - ttl-copy-to-inner: copy the TTL of the outer header to inner header, or - ttl-decrease-and-copy-to-inner: Decrease the TTL by one and copy it to inner header."; } identity no-action { base "ttl-action"; description "Do nothing regarding the TTL."; } identity copy-to-inner { base "ttl-action"; description "Copy the TTL of the outer header to inner header."; } identity decrease-and-copy-to-inner { base "ttl-action"; description "Decrease TTL by one and copy the TTL to inner header."; } identity decrease-and-copy-to-next { base "ttl-action"; description "Decrease TTL by one and copy the TTL to the next header.For example: when MPLS label swapping, decrease the TTL of the in label and copy it to the out label."; } typedef ttl-action-def { type identityref { base "ttl-action"; } description "TTL action def."; } Wang, et al. Expires May 4, 2016 [Page 22] Internet-Draft RIB DM November 2015 identity hop-limit-action { description "Base identify from which all hop limit actions are derived."; } identity hop-limit-no-action { base "hop-limit-action"; description "Do nothing regarding the hop limit."; } identity hop-limit-copy-to-inner { base "hop-limit-action"; description "Copy the hop limit of the outer header to inner header."; } typedef hop-limit-action-def { type identityref { base "hop-limit-action"; } description "IPv6 hop limit action def."; } identity special-nexthop { description "Base identify from which all special nexthops are derived."; } identity discard { base "special-nexthop"; description "This indicates that the network device should drop the packet and increment a drop counter."; } identity discard-with-error { base "special-nexthop"; description "This indicates that the network device should drop the packet, increment a drop counter and send back an appropriate error message Wang, et al. Expires May 4, 2016 [Page 23] Internet-Draft RIB DM November 2015 (like ICMP error)."; } identity receive { base "special-nexthop"; description "This indicates that that the traffic is destined for the network device. For example, protocol packets or OAM packets. All locally destined traffic SHOULD be throttled to avoid a denial of service attack on the router's control plane. An optional rate-limiter can be specified to indicate how to throttle traffic destined for the control plane."; } identity cos-value { base "special-nexthop"; description "Cos-value special nexthop."; } typedef special-nexthop-def { type identityref { base "special-nexthop"; } description "Special nexthop def."; } identity ip-route-match-type { description "Base identify from which all route match types are derived. Route match type could be: match source, or match destination, or match source and destination."; } identity match-ip-src { base "ip-route-match-type"; description "Source route match type."; } identity match-ip-dest { base "ip-route-match-type"; Wang, et al. Expires May 4, 2016 [Page 24] Internet-Draft RIB DM November 2015 description "Destination route match type"; } identity match-ip-src-dest { base "ip-route-match-type"; description "Src and Dest route match type"; } typedef ip-route-match-type-def { type identityref { base "ip-route-match-type"; } description "IP route match type def."; } identity rib-family { description "Base identify from which all rib address families are derived."; } identity ipv4-rib-family { base "rib-family"; description "IPv4 rib address family."; } identity ipv6-rib-family { base "rib-family"; description "IPv6 rib address family."; } identity mpls-rib-family { base "rib-family"; description "MPLS rib address family."; } identity ieee-mac-rib-family { base "rib-family"; description "MAC rib address family."; } typedef rib-family-def { Wang, et al. Expires May 4, 2016 [Page 25] Internet-Draft RIB DM November 2015 type identityref { base "rib-family"; } description "Rib address family def."; } identity route-type { description "Base identify from which all route types are derived."; } identity ipv4-route { base "route-type"; description "IPv4 route type."; } identity ipv6-route { base "route-type"; description "IPv6 route type."; } identity mpls-route { base "route-type"; description "MPLS route type."; } identity ieee-mac { base "route-type"; description "MAC route type."; } identity interface { base "route-type"; description "Interface route type."; } typedef route-type-def { type identityref { base "route-type"; } description Wang, et al. Expires May 4, 2016 [Page 26] Internet-Draft RIB DM November 2015 "Route type def."; } identity tunnel-type { description "Base identify from which all tunnel types are derived."; } identity ipv4-tunnel { base "tunnel-type"; description "IPv4 tunnel type"; } identity ipv6-tunnel { base "tunnel-type"; description "IPv6 Tunnel type"; } identity mpls-tunnel { base "tunnel-type"; description "MPLS tunnel type"; } identity gre-tunnel { base "tunnel-type"; description "GRE tunnel type"; } identity vxlan-tunnel { base "tunnel-type"; description "VxLAN tunnel type"; } identity nvgre-tunnel { base "tunnel-type"; description "NVGRE tunnel type"; } typedef tunnel-type-def { type identityref { base "tunnel-type"; Wang, et al. Expires May 4, 2016 [Page 27] Internet-Draft RIB DM November 2015 } description "Tunnel type def."; } identity route-state { description "Base identify from which all route states are derived."; } identity active { base "route-state"; description "Active state."; } identity inactive { base "route-state"; description "Inactive state."; } typedef route-state-def { type identityref { base "route-state"; } description "Route state def."; } identity nexthop-state { description "Base identify from which all nexthop states are derived."; } identity resolved { base "nexthop-state"; description "Reolved nexthop state."; } identity unresolved { base "nexthop-state"; description "Unresolved nexthop state."; } Wang, et al. Expires May 4, 2016 [Page 28] Internet-Draft RIB DM November 2015 typedef nexthop-state-def { type identityref { base "nexthop-state"; } description "Nexthop state def."; } identity route-installed-state { description "Base identify from which all route installed states are derived."; } identity uninstalled { base "route-installed-state"; description "Uninstalled state."; } identity installed { base "route-installed-state"; description "Installed state."; } typedef route-installed-state-def { type identityref { base "route-installed-state"; } description "Route installed state def."; } identity route-reason { description "Base identify from which all route reasons are derived."; } identity low-preference { base "route-reason"; description "Low preference"; } identity unresolved-nexthop { base "route-reason"; Wang, et al. Expires May 4, 2016 [Page 29] Internet-Draft RIB DM November 2015 description "Unresolved nexthop"; } identity higher-metric { base "route-reason"; description "Higher metric"; } typedef route-reason-def { type identityref { base "route-reason"; } description "Route reason def."; } typedef nexthop-preference-def { type uint8 { range "1..99"; } description "Nexthop-preference is used for protection schemes. It is an integer value between 1 and 99. A lower value indicates higher preference. To download a primary/standby/tertiary group to the FIB, the nexthops that are resolved and have two highest preferences are selected."; } typedef nexthop-lb-weight-def { type uint8 { range "1..99"; } description "Nhop-lb-weight is a number between 1 and 99."; } //Groupings grouping route-prefix { description "The common attributes used for all types of route prefix."; leaf route-index { type uint64 ; mandatory true; description "Route index."; } Wang, et al. Expires May 4, 2016 [Page 30] Internet-Draft RIB DM November 2015 container match { description "The match condition specifies the kind of route (IPv4, MPLS, etc.) and the set of fields to match on."; choice route-type { description "Route types: IPv4, IPv6, MPLS, MAC etc."; case ipv4 { description "IPv4 route case."; container ipv4 { description "IPv4 route match."; choice ip-route-match-type { description "IP route match type options: match source, or match destination, or match source and destination."; case dest-ipv4-address { leaf dest-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description "An IPv4 destination address as the match."; } } case src-ipv4-address { leaf src-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description "An IPv4 source address as the match."; } } case dest-src-ipv4-address { container dest-src-ipv4-address { description "A combination of an IPv4 source and an IPv4 destination address as the match."; leaf dest-ipv4-prefix { type inet:ipv4-prefix; mandatory true; description "The IPv4 destination address of the match."; } leaf src-ipv4-prefix { Wang, et al. Expires May 4, 2016 [Page 31] Internet-Draft RIB DM November 2015 type inet:ipv4-prefix; mandatory true; description "The IPv4 source address of the match"; } } } } } } case ipv6 { description "IPv6 route case."; container ipv6 { description "IPv6 route match."; choice ip-route-match-type { description "IP route match type options: match source, or match destination, or match source and destination."; case dest-ipv6-address { leaf dest-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description "An IPv6 destination address as the match."; } } case src-ipv6-address { leaf src-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description "An IPv6 source address as the match."; } } case dest-src-ipv6-address { container dest-src-ipv6-address { description "A combination of an IPv6 source and an IPv6 destination address as the match."; leaf dest-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description "The IPv6 destination address of the match"; Wang, et al. Expires May 4, 2016 [Page 32] Internet-Draft RIB DM November 2015 } leaf src-ipv6-prefix { type inet:ipv6-prefix; mandatory true; description "The IPv6 source address of the match."; } } } } } } case mpls-route { description "MPLS route case."; leaf mpls-label { type uint32 ; mandatory true; description "The label used for matching."; } } case mac-route { description "MAC rib case."; leaf mac-address { type uint32 ; mandatory true; description "The MAC address used for matching."; } } case interface-route { description "Interface route case."; leaf interface-identifier { type if:interface-ref; mandatory true; description "The interface used for matching."; } } } } } grouping route { description Wang, et al. Expires May 4, 2016 [Page 33] Internet-Draft RIB DM November 2015 "The common attributes usesd for all types of route."; uses route-prefix; container nexthop { description "The nexthop of the route."; uses nexthop; } container route-statistic { description "The statistic information of the route."; leaf route-state { type route-state-def; config false; description "Indicate a route's state: Active or Inactive."; } leaf route-installed-state { type route-installed-state-def; config false; description "Indicate that a route's installed states: Installed or uninstalled."; } leaf route-reason { type route-reason-def; config false; description "Indicate the route reason."; } } container route-attributes { description "Route attributes."; uses route-attributes; } container route-vendor-attributes { description "Route vendor attributes."; uses route-vendor-attributes; } } grouping nexthop-list { description "A generic nexthop list."; list nexthop-list { key "nexthop-member-id"; description Wang, et al. Expires May 4, 2016 [Page 34] Internet-Draft RIB DM November 2015 "A list of nexthop."; leaf nexthop-member-id { type uint32; mandatory true; description "A nexthop identifier that points to a nexthop list member. A nexthop list member is a nexthop."; } } } grouping nexthop-list-p { description "A nexthop list with preference parameter."; list nexthop-list { key "nexthop-member-id"; description "A list of nexthop."; leaf nexthop-member-id { type uint32; mandatory true; description "A nexthop identifier that points to a nexthop list member. A nexthop list member is a nexthop."; } leaf nexthop-preference { type nexthop-preference-def; mandatory true; description "Nexthop-preference is used for protection schemes. It is an integer value between 1 and 99. A lower value indicates higher preference. To download a primary/standby/tertiary group to the FIB, the nexthops that are resolved and have two highest preferences are selected."; } } } grouping nexthop-list-w { description "A nexthop list with weight parameter."; list nexthop-list { key "nexthop-member-id"; description "A list of nexthop."; Wang, et al. Expires May 4, 2016 [Page 35] Internet-Draft RIB DM November 2015 leaf nexthop-member-id { type uint32; mandatory true; description "A nexthop identifier that points to a nexthop list member. A nexthop list member is a nexthop."; } leaf nexthop-lb-weight { type nexthop-lb-weight-def; mandatory true; description "The weight of a nexthop of the load balance nexthops."; } } } grouping nexthop { description "The nexthop structure."; leaf nexthop-id { type uint32; mandatory true; description "The nexthop identifier of a nexthop."; } leaf sharing-flag { type boolean; mandatory true; description "To indicate whether a nexthop is sharable or non-sharable. true - sharable, means the nexthop can be shared with other routes false - non-sharable, means the nexthop can not be shared with other routes."; } choice nexthop-type { description "Nexthop type options."; case nexthop-base { container nexthop-base { description "The base nexthop."; uses nexthop-base; } } Wang, et al. Expires May 4, 2016 [Page 36] Internet-Draft RIB DM November 2015 case nexthop-chain { if-feature nexthop-chain; container nexthop-chain { description "A chain nexthop."; uses nexthop-list; } } case nexthop-replicates { if-feature nexthop-replicates; container nexthop-replicates { description "A replicates nexthop."; uses nexthop-list; } } case nexthop-protection { if-feature nexthop-protection; container nexthop-protection { description "A protection nexthop."; uses nexthop-list-p; } } case nexthop-load-balance { if-feature nexthop-load-balance; container nexthop-lbs { description "A load balance nexthop."; uses nexthop-list-w; } } } } grouping nexthop-base { description "The base nexthop."; choice nexthop-base-type { description "Nexthop base type options."; case special-nexthop { leaf special { type special-nexthop-def; description "A special nexthop."; } } Wang, et al. Expires May 4, 2016 [Page 37] Internet-Draft RIB DM November 2015 case egress-interface-nexthop { leaf outgoing-interface { type if:interface-ref; mandatory true; description "The nexthop is an outgoing interface."; } } case ipv4-address-nexthop { leaf ipv4-address { type inet:ipv4-address; mandatory true; description "The nexthop is an IPv4 address."; } } case ipv6-address-nexthop { leaf ipv6-address { type inet:ipv6-address; mandatory true; description "The nexthop is an IPv6 address."; } } case egress-interface-ipv4-nexthop { container egress-interface-ipv4-address{ leaf outgoing-interface { type if:interface-ref; mandatory true; description "Name of the outgoing interface."; } leaf ipv4-address { type inet:ipv4-address; mandatory true; description "The nexthop points to an interface with an IPv4 address."; } description "The nexthop is an Egress-interface and an ip address.This can be usesd in cases e.g.where the ip address is a link-local address."; } } case egress-interface-ipv6-nexthop { container egress-interface-ipv6-address { leaf outgoing-interface { Wang, et al. Expires May 4, 2016 [Page 38] Internet-Draft RIB DM November 2015 type if:interface-ref; mandatory true; description "Name of the outgoing interface."; } leaf ipv6-address { type inet:ipv6-address; mandatory true; description "The nexthop points to an interface with an IPv6 address."; } description "The nexthop is an Egress-interface and an ip address.This can be usesd in cases e.g.where the ip address is a link-local address."; } } case egress-interface-mac-nexthop { container egress-interface-mac-address { leaf outgoing-interface { type if:interface-ref; mandatory true; description "Name of the outgoing interface."; } leaf ieee-mac-address { type uint32; mandatory true; description "The nexthop points to an interface with a specific mac-address."; } description "The egress interface must be an ethernet interface. Address resolution is not required for this nexthop."; } } case tunnel-encap-nexthop { if-feature nexthop-tunnel; container tunnel-encap { uses tunnel-encap; description "This can be an encap representing an IP tunnel or MPLS tunnel or others as defined in info model. An optional egress interface can be chained to the tunnel encap to indicate which interface to send Wang, et al. Expires May 4, 2016 [Page 39] Internet-Draft RIB DM November 2015 the packet out on. The egress interface is useful when the network device contains Ethernet interfaces and one needs to perform address resolution for the IP packet."; } } case tunnel-decap-nexthp { if-feature nexthop-tunnel; container tunnel-decap { uses tunnel-decap; description "This is to specify decapsulating a tunnel header."; } } case logical-tunnel-nexthop { if-feature nexthop-tunnel; container logical-tunnel { uses logical-tunnel; description "This can be a MPLS LSP or a GRE tunnel (or others as defined in This document), that is represented by a unique identifier (e.g. name)."; } } case rib-name-nexthop { leaf rib-name { type string; description "A nexthop pointing to a rib indicates that the route lookup needs to continue in The specified rib. This is a way to perform chained lookups."; } } } } grouping route-vendor-attributes { description "Route vendor attributes."; } grouping logical-tunnel { description "A logical tunnel that is identified by a type and a tunnel name."; leaf tunnel-type { type tunnel-type-def; mandatory true; Wang, et al. Expires May 4, 2016 [Page 40] Internet-Draft RIB DM November 2015 description "A tunnel type."; } leaf tunnel-name { type string; mandatory true; description "A tunnel name that points to a logical tunnel."; } } grouping ipv4-header { description "The IPv4 header encapsulation information."; leaf src-ipv4-address { type inet:ipv4-address; mandatory true; description "The source ip address of the header."; } leaf dest-ipv4-address { type inet:ipv4-address; mandatory true; description "The destination ip address of the header."; } leaf protocol { type uint8; mandatory true; description "The protocol id of the header."; } leaf ttl { type uint8; description "The TTL of the header."; } leaf dscp { type uint8; description "The DSCP field of the header."; } } grouping ipv6-header { description "The IPv6 header encapsulation information."; leaf src-ipv6-address { Wang, et al. Expires May 4, 2016 [Page 41] Internet-Draft RIB DM November 2015 type inet:ipv6-address; mandatory true; description "The source ip address of the header."; } leaf dest-ipv6-address { type inet:ipv6-address; mandatory true; description "The destination ip address of the header."; } leaf next-header { type uint8; mandatory true; description "The next header of the IPv6 header."; } leaf traffic-class { type uint8; description "The traffic class value of the header."; } leaf flow-label { type uint16; description "The flow label of the header."; } leaf hop-limit { type uint8; description "The hop limit the header."; } } grouping nvgre-header { description "The NvGRE header encapsulation information."; choice nvgre-type { description "NvGRE can use eigher IPv4 or IPv6 header for encapsulation."; case ipv4 { uses ipv4-header; } case ipv6 { uses ipv6-header; } } Wang, et al. Expires May 4, 2016 [Page 42] Internet-Draft RIB DM November 2015 leaf virtual-subnet-id { type uint32; mandatory true; description "The subnet identifier of the NvGRE header."; } leaf flow-id { type uint16; description "The flow identifier of the NvGRE header."; } } grouping vxlan-header { description "The VxLAN encapsulation header information."; choice vxlan-type { description "NvGRE can use eigher IPv4 or IPv6 header for encapsulation."; case ipv4 { uses ipv4-header; } case ipv6 { uses ipv6-header; } } leaf vxlan-identifier { type uint32; mandatory true; description "The VxLAN identifier of the VxLAN header."; } } grouping gre-header { description "The GRE encapsulation header information."; choice dest-address-type { description "GRE options: IPv4 and IPv6"; case ipv4 { leaf ipv4-dest { type inet:ipv4-address; mandatory true; description "The destination ip address of the GRE header."; } Wang, et al. Expires May 4, 2016 [Page 43] Internet-Draft RIB DM November 2015 } case ipv6 { leaf ipv6-dest { type inet:ipv6-address; mandatory true; description "The destination ip address of the GRE header."; } } } leaf protocol-type { type uint16; mandatory true; description "The protocol type of the GRE header."; } leaf key { type uint64; description "The GRE key of the GRE header."; } } grouping mpls-header { description "The MPLS encapsulation header information."; list label-operations { key "label-oper-id"; description "Label operations."; leaf label-oper-id { type uint32; description "An optional identifier that points to a label operation."; } choice label-actions { description "Label action options."; case label-push { container label-push { description "Label push operation."; leaf label { type uint32; mandatory true; description "The label to be pushed."; Wang, et al. Expires May 4, 2016 [Page 44] Internet-Draft RIB DM November 2015 } leaf s-bit { type boolean; description "The s-bit of the label to be pushed. "; } leaf tc-value { type uint8; description "The traffic class value of the label to be pushed."; } leaf ttl-value { type uint8; description "The TTL value of the label to to be pushed."; } } } case label-swap { container label-swap { description "Label swap operation."; leaf in-label { type uint32; mandatory true; description "The label to be swapped."; } leaf out-label { type uint32; mandatory true; description "The out MPLS label."; } leaf ttl-action { type ttl-action-def; description "The label ttl actions: - No-action, or - Copy to inner label,or - Decrease (the in label) by 1 and copy to the out label."; } } } } } } Wang, et al. Expires May 4, 2016 [Page 45] Internet-Draft RIB DM November 2015 grouping tunnel-encap{ description "Tunnel encapsulation inforamtion."; choice tunnel-type { description "Tunnel options for next-hops."; case ipv4 { if-feature ipv4-tunnel; uses ipv4-header; } case ipv6 { if-feature ipv6-tunnel; uses ipv6-header; } case mpls { if-feature mpls-tunnel; uses mpls-header; } case gre { if-feature gre-tunnel; uses gre-header; } case nvgre { if-feature nvgre-tunnel; uses nvgre-header; } case vxlan { if-feature vxlan-tunnel; uses vxlan-header; } } } grouping tunnel-decap { description "Tunnel decapsulation inforamtion."; choice tunnel-type { description "Nexthop tunnel type options."; case ipv4 { if-feature ipv4-tunnel; container ipv4-decap { description "IPv4 decap."; leaf ipv4-decap { type tunnel-decap-action-def; mandatory true; description Wang, et al. Expires May 4, 2016 [Page 46] Internet-Draft RIB DM November 2015 "IPv4 decap operations."; } leaf ttl-action { type ttl-action-def; description "The ttl actions: no-action or copy to inner header."; } } } case ipv6 { if-feature ipv6-tunnel; container ipv6-decap { description "IPv6 decap."; leaf ipv6-decap { type tunnel-decap-action-def; mandatory true; description "IPv6 decap operations."; } leaf hop-limit-action { type hop-limit-action-def; description "The hop limit actions: no-action or copy to inner header."; } } } case mpls { if-feature mpls-tunnel; container label-pop { description "MPLS decap."; leaf label-pop { type mpls-label-action-def; mandatory true; description "Pop a label from the label stack."; } leaf ttl-action { type ttl-action-def; description "The label ttl actions: no-action or copy to inner label"; } } } Wang, et al. Expires May 4, 2016 [Page 47] Internet-Draft RIB DM November 2015 } } grouping route-attributes { description "Route attributes."; leaf route-preference { type uint32; mandatory true; description "ROUTE_PREFERENCE: This is a numerical value that allows for comparing routes from different protocols. Static configuration is also considered a protocol for the purpose of this field. It iss also known as administrative-distance. The lower the value, the higher the preference."; } leaf local-only { type boolean ; mandatory true; description "Indicate whether the attributes is local only."; } container address-family-route-attributes{ description "Address family related route attributes."; choice route-type { description "Address family related route attributes."; case ip-route-attributes { } case mpls-route-attributes { } case ethernet-route-attributes { } } } } container routing-instance { description "A routing instance, in the context of the RIB information model, is a collection of RIBs, interfaces, and routing parameters"; leaf name { type string; mandatory true; description Wang, et al. Expires May 4, 2016 [Page 48] Internet-Draft RIB DM November 2015 "The name of the routing instance.This MUST be unique across all routing instances in a given network device."; } list interface-list { key "name"; description "This represents the list of interfaces associated with this routing instance. The interface list helps constrain the boundaries of packet forwarding. Packets coming on these interfaces are directly associated with the given routing instance. The interface list contains a list of identifiers, with each identifier uniquely identifying an interface."; leaf name { type if:interface-ref; description "A reference to the name of a network layer interface."; } } leaf router-id { type yang:dotted-quad; description "Router ID - 32-bit number in the form of a dotted quad."; } leaf lookup-limit { type uint8; description "A limit on how many levels of a lookup can be performed."; } list rib-list { key "name"; description "A list of RIBs that are associated with the routing instance."; leaf name { type string; mandatory true; description "A reference to the name of each rib."; } leaf rib-family { type rib-family-def; mandatory true; description "The address family of a rib."; } leaf ip-rpf-check { Wang, et al. Expires May 4, 2016 [Page 49] Internet-Draft RIB DM November 2015 type boolean; description "Each RIB can be optionally associated with a ENABLE_IP_RPF_CHECK attribute that enables Reverse path forwarding (RPF) checks on all IP routes in that RIB. Reverse path forwarding (RPF) check is used to prevent spoofing and limit malicious traffic."; } list route-list { key "route-index"; description "A list of routes of a rib."; uses route; } } } /*RPC Operations*/ rpc rib-add { description "To add a rib to a instance"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of the rib that is to be added."; } leaf rib-family { type rib-family-def; mandatory true; description "The address family of the rib."; } leaf ip-rpf-check { type boolean; description "Each RIB can be optionally associated with a ENABLE_IP_RPF_CHECK attribute that enables Reverse path forwarding (RPF) checks on all IP routes in that RIB. Reverse path forwarding (RPF) check is used to prevent spoofing and limit malicious traffic."; } } output { leaf result { type boolean; Wang, et al. Expires May 4, 2016 [Page 50] Internet-Draft RIB DM November 2015 mandatory true; description "Return the result of the rib-add operation. true - success; false - failed."; } } } rpc rib-delete { description "To delete a rib from a routing instance. After deleting the rib, all routes installed in the rib will be deleted as well."; input { leaf rib-name { type string; mandatory true; description "A reference to the name of the rib that is to be deleted."; } } output { leaf result { type boolean; mandatory true; description "Return the result of the rib-delete operation. true - success; false - failed."; } } } rpc route-add { description "To add a route or a list of route to a rib"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } container routes { description "The routes to be added to the rib."; Wang, et al. Expires May 4, 2016 [Page 51] Internet-Draft RIB DM November 2015 list route-list { key "route-index"; description "The list of routes to be added."; uses route-prefix; container route-attributes { uses route-attributes; description "Route attributes."; } container route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; description "Route vendor attributes."; } container nexthop { uses nexthop; description "Nexthop."; } } } } output { leaf result { type boolean; mandatory true; description "Return the result of the route-add operation. true - success; false - failed."; } } } rpc route-delete { description "To delete a route or a list of route from a rib"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } container routes { description Wang, et al. Expires May 4, 2016 [Page 52] Internet-Draft RIB DM November 2015 "The routes to be added to the rib."; list route-list{ key "route-index"; description "The list of routes to be deleted."; uses route-prefix; } } } output { leaf result { type boolean ; mandatory true; description "Return the result of the route-delete operation. true - success; false - failed."; } } } rpc route-update { description "To update a route or a list of route of a rib. The inputs: 1. The match conditions, could be: a. route prefix, or b. route attribtes, or c. nexthop; 2. The update parameters to be used: a. new nexhop; b. new route attributes; Actions: 1. update the nexthop 2. update the route attributes The outputs: true - success; false - failed. "; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } choice match-conditions { Wang, et al. Expires May 4, 2016 [Page 53] Internet-Draft RIB DM November 2015 description "Match options."; case match-route-prefix { description "Update the routes that match route prefix(es) condition."; container input-routes { description "The matched routes to be updated."; list route-list { key "route-index"; description "The list of routes to be updated."; uses route-prefix; choice update-actions-prefix { description "Update actions: 1. update the nexthop 2. update the route attributes 3. update the route-vendor-attributes. "; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; } } } } } case match-route-attributes { description "Update the routes that match the route attributes condition."; container input-route-attributes { description "The route attributes are used for matching."; uses route-attributes; } choice update-actions-attributes { description "Update actions: 1. update the nexthop Wang, et al. Expires May 4, 2016 [Page 54] Internet-Draft RIB DM November 2015 2. update the route attributes 3. update the route-vendor-attributes."; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; } } } case match-route-vendor-attributes { if-feature route-vendor-attributes; description "Update the routes that match the vendor attributes condition"; container input-route-vendor-attributes { description "The vendor route attributes are used for matching."; uses route-vendor-attributes; } choice update-actions-vendor-attributes { description "Update actions: 1. update the nexthop 2. update the route attributes 3. update the route-vendor-attributes."; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { uses route-vendor-attributes; } } } case match-nexthop { description "Update the routes that match the nexthop."; container input-nexthop { description "The nexthop used for matching."; uses nexthop; Wang, et al. Expires May 4, 2016 [Page 55] Internet-Draft RIB DM November 2015 } choice update-actions-nexthop { description "Update actions: 1. update nexthop 2. update route attributes 3. update route-vendor-attributes."; case update-nexthop { uses nexthop; } case update-route-attributes { uses route-attributes; } case update-route-vendor-attributes { if-feature route-vendor-attributes; uses route-vendor-attributes; } } } } } output { leaf result { type boolean ; mandatory true; description "Return the result of the route-update operation. true - success; false - failed."; } } } rpc nh-add { description "To add a nexthop to a rib. Inputs parameters: 1. rib name 2. nexthop; Actions: Add the nexthop to the rib Outputs: 1.Operation result: true - success false - failed; 2. nexthop identifier."; input { Wang, et al. Expires May 4, 2016 [Page 56] Internet-Draft RIB DM November 2015 leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } uses nexthop; } output { leaf result { type boolean ; mandatory true; description "Return the result of the nh-add operation. true - success; false - failed."; } leaf nexthop-id { type uint32; mandatory true; description "A nexthop identifer that is allocated to the nexthop."; } } } rpc nh-delete { description "To delete a nexthop from a rib"; input { leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } uses nexthop; } output { leaf result { type boolean ; mandatory true; description "Return the result of the nh-delete operation. true - success; false - failed."; } } Wang, et al. Expires May 4, 2016 [Page 57] Internet-Draft RIB DM November 2015 } /*Notifications*/ notification nexthop-resolution-status-change { description "Nexthop resolution status (resolved/unresolved) notification."; container nexthop{ description "The nexthop."; uses nexthop; } leaf nexthop-state { type nexthop-state-def; mandatory true; description "Nexthop resolution status (resolved/unresolved) notification."; } } notification route-change { description "Route change notification."; leaf rib-name { type string; mandatory true; description "A reference to the name of a rib."; } leaf rib-family { type rib-family-def; mandatory true; description "A reference to address family of a rib."; } uses route-prefix; leaf route-installed-state { type route-installed-state-def; mandatory true; description "Indicates whether the route got installed in the FIB."; } leaf route-state { type route-state-def; mandatory true; description "Indicates whether a route is fully resolved and Wang, et al. Expires May 4, 2016 [Page 58] Internet-Draft RIB DM November 2015 is a candidate for selection."; } leaf route-change-reason { type route-reason-def; mandatory true; description "Return the reason that causes the route change."; } } } // 4. IANA Considerations This document requests to register a URI in the "IETF XML registry" [RFC3688]: -------------------------------------------------------------------- URI: urn:ietf:params:xml:ns:yang:ietf-i2rs-rib Registrant Contact: The IESG.XML: N/A, the requested URI is an XML namespace. -------------------------------------------------------------------- This document requests to register a YANG module in the "YANG Module Names registry" [RFC6020]: -------------------------------------------------------------------- name: ietf-i2rs-rib namespace: urn:ietf:params:xml:ns:yang:ietf-i2rs-rib prefix: iir reference: RFC XXXX -------------------------------------------------------------------- 5. Security Considerations This document introduces no extra new security threat and SHOULD follow the security requirements as stated in [I-D.ietf-i2rs-architecture]. 6. Contributors The following individuals also contribute to this document. o Zekun He, Tencent Holdings Ltd o Sujian Lu, Tencent Holdings Ltd Wang, et al. Expires May 4, 2016 [Page 59] Internet-Draft RIB DM November 2015 o Jeffery Zhang, Juniper Networks 7. References 7.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, . 7.2. Informative References [I-D.ietf-i2rs-architecture] Atlas, A., Halpern, J., Hares, S., Ward, D., and T. Nadeau, "An Architecture for the Interface to the Routing System", draft-ietf-i2rs-architecture-09 (work in progress), March 2015. [I-D.ietf-i2rs-rib-info-model] Bahadur, N., Kini, S., and J. Medved, "Routing Information Base Info Model", draft-ietf-i2rs-rib-info-model-08 (work in progress), October 2015. [I-D.ietf-i2rs-usecase-reqs-summary] Hares, S. and M. Chen, "Summary of I2RS Use Case Requirements", draft-ietf-i2rs-usecase-reqs-summary-01 (work in progress), May 2015. Authors' Addresses Lixing Wang Individual Email: wang_little_star@sina.com Wang, et al. Expires May 4, 2016 [Page 60] Internet-Draft RIB DM November 2015 Hariharan Ananthakrishnan Packet Design Email: hari@packetdesign.com Mach(Guoyi) Chen Huawei Email: mach.chen@huawei.com Amit Dass Ericsson Torshamnsgatan 48. Stockholm 16480 Sweden Email: amit.dass@ericsson.com Sriganesh Kini Ericsson Email: sriganesh.kini@ericsson.com Nitin Bahadur Bracket Computing Email: nitin_bahadur@yahoo.com Wang, et al. Expires May 4, 2016 [Page 61]