Routing Area I. Chen Internet-Draft Jabil Intended status: Standards Track A. Choudhary Expires: September 04, 2018 Cisco March 05, 2018 Forwarding Policy YANG Model draft-ichen-rtgwg-forwarding-policy-yang-00 Abstract This document defines a YANG data model to manage forwarding policies. The forwarding policy YANG model is based on the generic Quality-of-Service (Qos) policy YANG model ietf-qos-policy.yang, and includes augmented data nodes specific to forwarding policies. 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 September 04, 2018. Copyright Notice Copyright (c) 2018 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 2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2 3. Design of the Data Model . . . . . . . . . . . . . . . . . . . 2 Chen & Choudhary Expires September 04, 2018 [Page 1] Internet-Draft Forwarding Policy YANG March 2018 3.1. Forwarding Policy Actions . . . . . . . . . . . . . . . . 2 3.2. Tree View . . . . . . . . . . . . . . . . . . . . . . . . 3 4. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 5 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 7. Security Considerations . . . . . . . . . . . . . . . . . . . 6 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 8.1. Normative References . . . . . . . . . . . . . . . . . . . 6 8.2. Informative References . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction This document defines a YANG [RFC7950] data model to manage forwarding policies via protocols such as NETCONF [RFC6241]. A forwarding policy is a policy that defines several rules. Each rule defines matching criteria and corresponding actions applied to packets such that packets matching those criteria are forwarded differently from what the routing table dictates. The forwarding policy YANG model is based on the generic base policy model called ietf-qos-policy.yang defined in the QoS YANG model [I-D .asechoud-rtgwg-qos-model]. Each forwarding policy is modeled as a QoS policy with a new type, the forwarding policy type. The forwarding policy YANG model defines an augment to the base QoS policy that adds parameters specific to forwarding policies. These added parameters are the packet handling actions that are specific to forwarding policies. In the rest of this document, Section 3.1 describes the model details, particularly the packet handling actions specific to forwarding policies that are defined in this model. Section 3.2 provides a tree view of the model, and Section 4 provides the forwarding policy YANG model in its entirety. 2. 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]. 3. Design of the Data Model 3.1. Forwarding Policy Actions Because a forwarding policy is conceptually similar to a Quality-of- Service (QoS) policy where packets matching certain criteria are handled differently as these packets traverse the router and egress the router, the forwarding policy YANG model is based on the generic base QoS policy model ietf-qos-policy.yang, which is defined in the QoS YANG model [I-D.asechoud-rtgwg-qos-model]. What is specific to a forwarding policy is how packets are forwarded. Instead of forwarding packets based on the routing table, packets are forwarded based on a forwarding policy. Chen & Choudhary Expires September 04, 2018 [Page 2] Internet-Draft Forwarding Policy YANG March 2018 This forwarding policy model currently defines three common forwarding actions: drop and forwarding to one or more user configured IPv4 or IPv6 nexthops instead of what the routing table dictates. The model also allows for specifying the network instance [I-D.ietf-rtgwg-ni-model] to which the nexthops are associated. If necessary, other more advanced forwarding actions can be augmented to the forwarding policy as vendor augmentations. 3.2. Tree View module: ietf-forwarding-policy augment /pol:policies/pol:policy-entry/pol:classifier-entry /pol:classifier-action-entry-cfg/pol:action-cfg-params: +--:(drop) | +--rw drop-actions | +--rw drop? empty +--:(redirect-to-ipv4-nexthops) | +--rw redirect-to-ipv4-nexthops-actions | +--rw ipv4-nexthop* [address] | | +--rw address inet:ipv4-address | +--rw network-instance? -> /ni:network-instances /network-instance/name +--:(redirect-to-ipv6-nexthops) +--rw redirect-to-ipv6-nexthops +--rw ipv6-nexthop* [address] | +--rw address inet:ipv6-address +--rw network-instance? -> /ni:network-instances /network-instance/name 4. YANG Module Chen & Choudhary Expires September 04, 2018 [Page 3] Internet-Draft Forwarding Policy YANG March 2018 file "ietf-forwarding-policy@2018-03-05.yang" module ietf-forwarding-policy { yang-version "1.1"; namespace "urn:ietf:params:xml:ns:yang:ietf-forwarding-policy"; prefix "fwd"; import ietf-inet-types { prefix "inet"; } import ietf-network-instance { prefix "ni"; } import ietf-qos-policy { prefix "pol"; } organization ""; contact ""; description ""; revision 2018-03-05 { description "Initial version"; reference ""; } identity forwarding-policy { base pol:policy-type; description "Forwarding policy type"; } identity redirect-action { base pol:action-type; description "Redirect action type"; } augment "/pol:policies" + "/pol:policy-entry" + "/pol:classifier-entry" + "/pol:classifier-action-entry-cfg" + "/pol:action-cfg-params" { when "../../pol:policy-type = 'fwd:forwarding-policy'" { description "Forwarding policy's action augmentation"; } description "Forwarding policy's action parameters"; case drop { description "Drop action choice"; container drop-actions { description "Redirect action that are drop actions"; leaf drop { type empty; description "Redirect packet such that it is dropped"; Chen & Choudhary Expires September 04, 2018 [Page 4] Internet-Draft Forwarding Policy YANG March 2018 } } } case redirect-to-ipv4-nexthops { container redirect-to-ipv4-nexthops-actions { description "Actions to redirect to a list of nexthops"; list ipv4-nexthop { key "address"; leaf address { type inet:ipv4-address; description "The IPv4 address"; } description "A list of IPv4 nexthops"; } leaf network-instance { type leafref { path "/ni:network-instances/ni:network-instance/ni:name"; } description "The routing instance in which the addresses " + "reside"; } } } case redirect-to-ipv6-nexthops { container redirect-to-ipv6-nexthops { description "Redirect actions to IPv6 nexthops"; list ipv6-nexthop { key "address"; leaf address { type inet:ipv6-address; description "The IPv6 address"; } description "A list of IPv6 nexthop addresses"; } leaf network-instance { type leafref { path "/ni:network-instances/ni:network-instance/ni:name"; } description "The routing instance in which the addresses " + "reside"; } } } } } 5. Acknowledgments TBD 6. IANA Considerations TBD Chen & Choudhary Expires September 04, 2018 [Page 5] Internet-Draft Forwarding Policy YANG March 2018 7. Security Considerations TBD 8. References 8.1. Normative References [I-D.asechoud-rtgwg-qos-model] Choudhary, A., Jethanandani, M., Strahle, N., Aries, E. and I. Chen, "YANG Model for QoS", Work in Progress, draft-asechoud-rtgwg-qos-model-03, December 2017. [I-D.ietf-rtgwg-ni-model] Berger, L., Hopps, C., Lindem, A. and D. Bogdanovic, "YANG Network Instances", Work in Progress, draft-ietf-rtgwg-ni- model-10, Februrary 2018. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/ RFC2119, March 1997, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . 8.2. Informative References [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J.Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . Authors' Addresses I. Chen Jabil Email: ing-wher_chen@jabil.com A. Choudhary Cisco Email: asechoud@cisco.com Chen & Choudhary Expires September 04, 2018 [Page 6]