Network Working Group J. Dong Internet-Draft X. Wei Intended status: Experimental Huawei Technologies Expires: April 24, 2015 October 21, 2014 A YANG Data Model for Layer-2 Network Topologies draft-dong-i2rs-l2-network-topology-00 Abstract This document defines a YANG data model for layer-2 network topologies. 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 April 24, 2015. Copyright Notice Copyright (c) 2014 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 Dong & Wei Expires April 24, 2015 [Page 1] Internet-Draft Layer-2 Network Topology Data Model October 2014 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. Layer-2 Topology Model . . . . . . . . . . . . . . . . . . . 2 3. Layer-2 Topology Yang Module . . . . . . . . . . . . . . . . 5 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11 5. Security Considerations . . . . . . . . . . . . . . . . . . . 11 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1. Normative References . . . . . . . . . . . . . . . . . . 11 6.2. Informative References . . . . . . . . . . . . . . . . . 12 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12 1. Introduction [I-D.medved-i2rs-topology-im] specifies the generic network topology information model, and approaches to extend the generic network topology information model to specific type of network topologies. It also provides the extensions made for Layer-3 unicast IGP, IS-IS and OSPF topologies. [I-D.clemm-i2rs-yang-network-topo] defines the Yang [RFC6020] [RFC6021] data models for generic network topology, L3 unicast IGP, IS-IS, OSPF and TED which are derived from the information model defined in [I-D.medved-i2rs-topology-im]. Besides the information collected through "live" layer-3 IGP, [I-D.amante-i2rs-topology-use-cases] also specifies the collection of network information which is not visible within the Layer 3 IGP's LSDB. Such information can be links, nodes, or properties of those links or nodes in lower layers of the network. The requirements on the topology data model in [I-D.medved-i2rs-topology-requirements] also include the physical properties associated with the ports/ interfaces, and information associated with the network element's immediately adjacent neighbors. This document defines the Yang data model for layer-2 network topologies by extending the generic network topology data model defined in [I-D.clemm-i2rs-yang-network-topo]. 2. Layer-2 Topology Model In order to represent a layer-2 network topology, the generic network topology model needs to be extended to contain layer-2 specific information. Module "l2-topology" applies the generic network topology model to layer-2 network topologies, and augments the Dong & Wei Expires April 24, 2015 [Page 2] Internet-Draft Layer-2 Network Topology Data Model October 2014 generic network topology with information specific to layer-2 networks. The relationship between the l2-topology model and the generic network topology model is shown in the figure below: +---------------------+ | network-topology | +----------+----------+ ^ | | +----------^----------+ | l2-topology | +---------------------+ Figure 1. L2-topology and generic network-topology For layer-2 network topology, there are some layer-2 specific data and attributes to be added to the generic network topology model, such as properties of layer-2 links or nodes, descriptions, layer-2 addresses, etc. Information collected through LLDP and LLDP-MED could be included in the layer-2 network topology. The structure of "L2-topology" data model is depicted in the following diagram. Brackets enclose list keys, "rw" means configuration data, "ro" means operational state data, "?" designates optional nodes, "*" designates nodes that can have multiple instances. Parantheses enclose choice and case nodes. Dong & Wei Expires April 24, 2015 [Page 3] Internet-Draft Layer-2 Network Topology Data Model October 2014 module: l2-topology augment /nt:network-topology/nt:topology/nt:topology-types: +--rw l2-topology! augment /nt:network-topology/nt:topology: +--rw l2-topology-attributes +--rw name? string +--rw flag* flag-type augment /nt:network-topology/nt:topology/nt:node: +--rw l2-node-attributes +--rw name? string +--rw description? string +--rw chassis-id? yang:mac-address +--rw management-address* inet:ip-prefix +--rw management-vid? vlan +--rw capabilities-support? bits +--rw capabilities-enable? bits +--rw flag* flag-type augment /nt:network-topology/nt:topology/nt:link: +--rw l2-link-attributes +--rw name? string +--rw rate? decimal64 +--rw flag* flag-type augment /nt:network-topology/nt:topology/nt:node/nt:termination-point: +--rw l2-termination-point-attributes +--rw description? string +--rw mac-address? yang:mac-address +--rw port-vlan-id? vlan +--rw ppvid | +--rw ppvid? vlan | +--rw ppvid-flags? bits +--rw vlan-name* [vlan-id] | +--rw vlan-id vlan | +--rw vlan-name? string +--rw auto-negotiation? bits +--rw link-aggregation | +--rw aggregation-status? bits | +--rw aggregated-port-id? string +--rw oper-mau? bits +--rw maximum-frame-size? uint32 The L2-topology module augments the generic network-topology module as follows: o A new topology type "l2-topology-type" is introduced. This is represented by a container object, and is inserted under the "topology-types" container of the generic network-topology module in [I-D.clemm-i2rs-yang-network-topo]. Dong & Wei Expires April 24, 2015 [Page 4] Internet-Draft Layer-2 Network Topology Data Model October 2014 o Additional topology attributes are introduced in a grouping "l2- topology-attributes", which augments the "topology" list of the network topology module in [I-D.clemm-i2rs-yang-network-topo]. The attributes include an Layer-2 topology name and a set of flags. Each type of flag is represented by a separate identity. o Additional data objects for nodes are introduced by augmenting the "node" list of the generic network-topology module. New objects include a series of node properties and parameters, as well as a set of flags. o Additional data objects for termination points are introduced by augmenting the "termination-point" list of the generic network- topology module. New objects include a series of port properties and parameters. o Links are augmented as well with a set of parameters, allowing to associate a link with an L2 name, the link rate and another set of flags. 3. Layer-2 Topology Yang Module file "l2-topology@2014-10-21.yang" module l2-topology { yang-version 1; namespace "urn:TBD:params:xml:ns:yang:nt:l2-topology"; // replace with IANA namespace when assigned prefix "l2t"; import network-topology { prefix "nt"; } import ietf-inet-types { prefix "inet"; } import ietf-yang-types { prefix "yang"; } organization "TBD"; contact "TBD"; revision "2014-10-21" { description "Initial revision"; reference "TBD"; Dong & Wei Expires April 24, 2015 [Page 5] Internet-Draft Layer-2 Network Topology Data Model October 2014 } typedef vlan { description "VLAN ID"; type uint32 { range "1..4095"; } } identity flag-identity { description "Base type for flags"; } typedef flag-type { type identityref { base "flag-identity"; } } grouping l2-topology-type { container l2-topology { presence "indicates L2 Topology"; } } grouping l2-topology-attributes { container l2-topology-attributes { leaf name { description "Name of the topology"; type string; } leaf-list flag { description "Topology flags"; type flag-type; } } } grouping l2-node-attributes { container l2-node-attributes { leaf name { description "Node name"; type string; } leaf description { description "Node description"; type string; } Dong & Wei Expires April 24, 2015 [Page 6] Internet-Draft Layer-2 Network Topology Data Model October 2014 leaf chassis-id { description "System MAC address"; type yang:mac-address; } leaf-list management-address { description "System management address"; type inet:ip-prefix; } leaf management-vid { description "System management VID"; type vlan; } leaf capabilities-support { description "System capabilities"; type bits { bit other { position 1; } bit mac-bridge { position 2; } bit router { position 3; } } } leaf capabilities-enable { description "System enabled capabilities"; type bits { bit other { position 1; } bit mac-bridge { position 2; } bit router { position 3; } } } leaf-list flag { description "Node operational flags"; type flag-type; } } } grouping l2-link-attributes { Dong & Wei Expires April 24, 2015 [Page 7] Internet-Draft Layer-2 Network Topology Data Model October 2014 container l2-link-attributes { leaf name { description "Link Name"; type string; } leaf rate { description "Link rate"; type decimal64 { fraction-digits 2; } } leaf-list flag { description "Link flags"; type flag-type; } } } // grouping l2-link-attributes grouping l2-termination-point-attributes { container l2-termination-point-attributes { leaf description { description "Port description"; type string; } leaf mac-address { description "Interface MAC address"; type yang:mac-address; } leaf port-vlan-id { description "Port VLAN ID"; type vlan; } container ppvid { description "Port and protocol VLAN ID"; leaf ppvid { type vlan; } leaf ppvid-flags { type bits { bit port-protocol-vlan-supported { position 1; } bit port-protocol-vlan-enabled { position 2; } } } } Dong & Wei Expires April 24, 2015 [Page 8] Internet-Draft Layer-2 Network Topology Data Model October 2014 list vlan-name { key "vlan-id"; description "Interface configured VLANs"; leaf vlan-id { type vlan; } leaf vlan-name { type string; } } leaf auto-negotiation { type bits { bit auto-negotiation-support { position 0; } bit auto-negotiation-enable { position 1; } } } container link-aggregation { leaf aggregation-status { description "Link aggregation capabilities and status"; type bits { bit aggregation-capability { position 0; } bit aggregation-status { position 1; } } } leaf aggregated-port-id { type string; } } leaf oper-mau { type bits { bit bother { position 0; } bit b10base-t { position 1; } bit b10base-tfd { position 2; } bit b100base-t4 { Dong & Wei Expires April 24, 2015 [Page 9] Internet-Draft Layer-2 Network Topology Data Model October 2014 position 3; } bit b100base-tx { position 4; } bit b100base-txfd { position 5; } bit b100base-t2 { position 6; } bit b100base-t2fd { position 7; } bit bfdx-pause { position 8; } bit bfdx-apause { position 9; } bit bfdx-spause { position 10; } bit bfdx-bpause { position 11; } bit b1000base-X { position 12; } bit b1000base-xfd { position 13; } bit b1000base-t { position 14; } bit b1000base-tfd { position 15; } } } leaf maximum-frame-size { description "interface maximum frame size"; type uint32; } } } // grouping l2-termination-point-attributes Dong & Wei Expires April 24, 2015 [Page 10] Internet-Draft Layer-2 Network Topology Data Model October 2014 augment "/nt:network-topology/nt:topology/nt:topology-types" { uses l2-topology-type; } augment "/nt:network-topology/nt:topology" { when "nt:topology-types/l2-topology"; uses l2-topology-attributes; } augment "/nt:network-topology/nt:topology/nt:node" { when "../nt:topology-types/l2-topology"; uses l2-node-attributes; } augment "/nt:network-topology/nt:topology/nt:link" { when "../nt:topology-types/l2-topology"; uses l2-link-attributes; } augment "/nt:network-topology/nt:topology/nt:node/nt:termination-point" { when "../../nt:topology-types/l2-topology"; uses l2-termination-point-attributes; } } 4. IANA Considerations This document makes no request of IANA. Note to RFC Editor: this section may be removed on publication as an RFC. 5. Security Considerations The transport protocol used for sending the topology data MUST support authentication and SHOULD support encryption. The data-model by itself does not create any security implications. 6. References 6.1. Normative References [I-D.clemm-i2rs-yang-network-topo] Clemm, A., Medved, J., Tkacik, T., Varga, R., Bahadur, N., and H. Ananthakrishnan, "A YANG Data Model for Network Topologies", draft-clemm-i2rs-yang-network-topo-01 (work in progress), October 2014. Dong & Wei Expires April 24, 2015 [Page 11] Internet-Draft Layer-2 Network Topology Data Model October 2014 [I-D.medved-i2rs-topology-im] Medved, J., Bahadur, N., Clemm, A., and H. Ananthakrishnan, "An Information Model for Network Topologies", draft-medved-i2rs-topology-im-01 (work in progress), October 2013. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC6020] Bjorklund, M., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, October 2010. [RFC6021] Schoenwaelder, J., "Common YANG Data Types", RFC 6021, October 2010. 6.2. Informative References [I-D.amante-i2rs-topology-use-cases] Medved, J., Previdi, S., Lopez, V., and S. Amante, "Topology API Use Cases", draft-amante-i2rs-topology-use- cases-01 (work in progress), October 2013. [I-D.medved-i2rs-topology-requirements] Medved, J., Previdi, S., Gredler, H., Nadeau, T., and S. Amante, "Topology API Requirements", draft-medved-i2rs- topology-requirements-00 (work in progress), February 2013. Authors' Addresses Jie Dong Huawei Technologies Huawei Campus, No. 156 Beiqing Rd. Beijing 100095 China Email: jie.dong@huawei.com Xiugang Wei Huawei Technologies Huawei Campus, No. 156 Beiqing Rd. Beijing 100095 China Email: weixiugang@huawei.com Dong & Wei Expires April 24, 2015 [Page 12]