IDR Working Group K. Patel Internet-Draft D. Jain Intended status: Standards Track Cisco Expires: January 9, 2017 S. Hares Huawei July 8, 2016 Yang Data Model for BGP extended features draft-keyupate-idr-bgp-ext-yang-00.txt Abstract This document defines a YANG data model that can be used to configure and manage BGP features which are not covered in the base BGP YANG data model. 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 January 9, 2017. Copyright Notice Copyright (c) 2016 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. Patel, et al. Expires January 9, 2017 [Page 1] Internet-Draft Yang Data Model for BGP extended features July 2016 This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 2. Definitions and Acronyms . . . . . . . . . . . . . . . . . . 3 3. BGP extended features . . . . . . . . . . . . . . . . . . . . 3 3.1. AIGP . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2. Aggregate routes . . . . . . . . . . . . . . . . . . . . 4 3.3. DMZ link bandwidth . . . . . . . . . . . . . . . . . . . 4 3.4. Network . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.5. Dampening . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Yang model . . . . . . . . . . . . . . . . . . . . . . . . . 4 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 6. Security Considerations . . . . . . . . . . . . . . . . . . . 13 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.1. Normative References . . . . . . . . . . . . . . . . . . 13 8.2. Informative References . . . . . . . . . . . . . . . . . 15 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15 1. Introduction YANG [RFC6020] is a data definition language that was introduced to define the contents of a conceptual data store that allows networked devices to be managed using NETCONF [RFC6241]. YANG is proving relevant beyond its initial confines, as bindings to other interfaces (e.g. ReST) and encodings other than XML (e.g. JSON) are being defined. Furthermore, YANG data models can be used as the basis of implementation for other interfaces, such as CLI and programmatic APIs. This document defines a YANG data model that can be used to configure and manage BGP features which are not covered in the base model [I-D.ietf-idr-bgp-model]. This model is defined by augmenting the applicable containers from the base BGP model. Patel, et al. Expires January 9, 2017 [Page 2] Internet-Draft Yang Data Model for BGP extended features July 2016 1.1. 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]. 2. Definitions and Acronyms AF: Address Family AIGP: Accumulated IGP AS: Autonomous System BGP: Border Gateway Protocol DMZ: Demilitarized zone. Used in context of DMZ link bandwidth for a link that connects two single hop eBGP peers. IGP: Interior Gatewate Protocol MED(med): Multi Exit Discriminator NETCONF: Network Configuration Protocol ReST: Representational State Transfer, a style of stateless interface and protocol that is generally carried over HTTP YANG: Data definition language for NETCONF 3. BGP extended features This yang model covers a number of BGP extended features by augmenting BGP base model defiend in [I-D.ietf-idr-bgp-model]. These features are described below. This model is expected to grow with more such features in future. 3.1. AIGP The Accumulated IGP Metric Attribute for BGP is an optional non- transitive BGP path attribute and is specified in [RFC7311]. Configuration to enable and set the parameters for AIGP are applicable per address family per neighbor granularity. These are defined by agumenting AF containers under neighbor and peer-group from base BGP model [I-D.ietf-idr-bgp-model]. Patel, et al. Expires January 9, 2017 [Page 3] Internet-Draft Yang Data Model for BGP extended features July 2016 3.2. Aggregate routes This refers to the BGP specific configuration for enabling mechanisms for route aggregation as per [RFC4271] [RFC2519] . These parameters are modeled as new leafs augmenting global address family containers from the BGP base yang model [I-D.ietf-idr-bgp-model]. 3.3. DMZ link bandwidth The BGP link bandwidth feature is used to advertise the bandwidth of an autonomous system exit link as an extended community [TODO: reference]. Configuration to enable DMZ link bandwidth extended community is modeled by augmenting BGP neighbor and peer-group containers defined in [I-D.ietf-idr-bgp-model]. 3.4. Network Leafs to add network in BGP routing table. BGP global address family container from the base BGP model [I-D.ietf-idr-bgp-model] is agumented for this purpose. 3.5. Dampening Configration parameters for BGP dampening behavior as defined in [RFC2439]. These parameters are defined under BGP global address family mode. 4. Yang model module: ietf-bgp-extensions augment /bgp:bgp/bgp:global: augment /bgp:bgp/bgp:global/bgp:afi-safis/bgp:afi-safi: +--rw aggregate-addr | +--rw aggregate-address? inet:ip-address | +--rw summary-only? boolean | +--rw as-set? boolean | +--rw as-confed-set? boolean | +--rw route-policy? string +--rw aggregate-timer | +--rw enable? boolean | +--rw threshold? uint16 +--rw network | +--rw network? inet:ip-address | +--rw policy? string +--rw bgp-dampening | +--rw half-time? uint8 | +--rw reuse-limit? uint16 Patel, et al. Expires January 9, 2017 [Page 4] Internet-Draft Yang Data Model for BGP extended features July 2016 | +--rw supresss-limit? uint16 | +--rw max-supress-time? uint8 | +--rw policy? string | ... +--rw auto-summary? boolean +--rw advertise-best-external? boolean augment /bgp:bgp/bgp:neighbors/bgp:neighbor: +--rw propagate-dmzlink-bw? boolean augment /bgp:bgp/bgp:neighbors/bgp:neighbor/bgp:afi-safis/bgp:afi-safi: +--rw aigp | +--rw enable? boolean | +--rw send-med? boolean | +--rw send-cost-community | +--rw id? uint32 | +--rw igp-cost-transitive? boolean | +--rw point-of-insertion? enumeration +--rw soft-reconfig? enumeration augment /bgp:bgp/bgp:peer-groups/bgp:peer-group: +--rw propagate-dmzlink-bw? boolean augment /bgp:bgp/bgp:peer-groups/bgp:peer-group/bgp:afi-safis/bgp:afi-safi: +--rw aigp | +--rw enable? boolean | +--rw send-med? boolean | +--rw send-cost-community | +--rw id? uint32 | +--rw igp-cost-transitive? boolean | +--rw point-of-insertion? enumeration +--rw soft-reconfig? enumeration file "ietf-bgp-extensions@2016-07-08.yang" module ietf-bgp-extensions { namespace "urn:ietf:params:xml:ns:yang:ietf-bgp-extensions"; // replace with IANA namespace when assigned prefix bgp-ext; import ietf-inet-types { prefix inet; Patel, et al. Expires January 9, 2017 [Page 5] Internet-Draft Yang Data Model for BGP extended features July 2016 } import ietf-bgp { prefix bgp; revision-date 2016-01-06; } organization "Cisco Systems 170 West Tasman Drive San Jose, CA 95134-1706 USA"; contact "Keyur Patel keyupate@cisco.com Dhanendra Jain dhjain@cisco.com Susan Hares shares@ndzh.com"; description "This YANG module defines the extensions to the base BGP yang model common across all of the vendor implementations of the protocol. It is intended that the model will be extended by vendors to define vendor-specific models. Terms and Acronyms AIGP (aigp): Accumulated IGP BGP (bgp): Border Gateway Protocol IGP (igp): Interior Gateway Protocol IP (ip): Internet Protocol IPv4 (ipv4):Internet Protocol Version 4 IPv6 (ipv6): Internet Protocol Version 6 MED(med): Multi Exit Discriminator MTU (mtu) Maximum Transmission Unit "; revision 2016-07-08 { description "Initial revision."; Patel, et al. Expires January 9, 2017 [Page 6] Internet-Draft Yang Data Model for BGP extended features July 2016 reference "RFC XXXX: A YANG Data Model for BGP extended features"; } // // AIGP parameters used in global mode and neighbor AF mode. // grouping bgp-aigp { description "A set of configuration parameters applicable for AIGP configuration"; container aigp { description "AIGP configuration parameters"; leaf enable { type boolean; description "Enable AIGP"; } leaf send-med { type boolean; description "Send AIGP value in MED"; } container send-cost-community { description "Send AIGP value in Cost Community"; leaf id { type uint32; description "Cost Community ID"; } leaf igp-cost-transitive { type boolean; description "Enable transitive cost community"; } leaf point-of-insertion { type enumeration { enum igp-cost { description "Cost community is used after IGP distance to next-hop"; } enum pre-bestpath { description "Cost community is first step in best-path calculation"; } } description "Point of insertion for best-path calculation"; } } } } // // DMZ link bandwidth params // Patel, et al. Expires January 9, 2017 [Page 7] Internet-Draft Yang Data Model for BGP extended features July 2016 grouping bgp-dmz-link-bw { description "A set of configuration parameters for DMZ link bandwidth"; leaf propagate-dmzlink-bw { type boolean; description "Propagate the DMZ link bandwidth."; } } // // BGP dampening params // grouping bgp-dampening-params { description "BGP dampening parameters"; container bgp-dampening { description "BGP Route Flap Dampening."; leaf half-time { type uint8 { range "1..45"; } description "Half Time (in minutes) to reduce the penalty assigned to a route by half."; } leaf reuse-limit { type uint16 { range "1..20000"; } description "A configurable numeric value that is compared with the penalty. If the penalty is less than the reuse limit, a suppressed route that is up will no longer be suppressed. "; } leaf supresss-limit { type uint16 { range "1..20000"; } description "A configurable numeric value that is compared with the penalty. If the penalty is greater than the suppress limit, the route is suppressed"; } Patel, et al. Expires January 9, 2017 [Page 8] Internet-Draft Yang Data Model for BGP extended features July 2016 leaf max-supress-time { type uint8 { range "1..255"; } description "The longest amount of time, in minutes, that a route can be suppressed."; } leaf policy { type string ; //TBD leafref to policy model description "Policy to specify criteria for dampening"; } } } // // Grouping for Aggregate address // grouping bgp-aggregate-addr { description "BGP aggregate address parameters grouping"; container aggregate-addr { description "Aggregate address configuration"; leaf aggregate-address { type inet:ip-address; description "Configure BGP aggregate address."; } leaf summary-only { type boolean; description "Filter more specific routes from updates"; } leaf as-set { type boolean; description "Generate AS set path information"; } leaf as-confed-set { type boolean; description "Generate AS confed set path information"; } leaf route-policy { type string; description "Policy to filter routes and specify conditions"; } } } // // Grouping for soft reconfig Patel, et al. Expires January 9, 2017 [Page 9] Internet-Draft Yang Data Model for BGP extended features July 2016 // grouping soft-reconfig { description "Soft reconfig parameters. Configuring this enables storing of routes as received by this node, prior to applying inbound route-policy"; leaf soft-reconfig { type enumeration { enum "always" { description "Use soft reconfig database upon neighbor reset even if route refresh is configured"; } enum "backup" { description "Use soft reconfig database as backup to route refresh"; } } description "Enable storing of unprocessed routes as received by this node"; } } // // Grouping for all AF extensions. // grouping bgp-af-extension-cfg { description "Grouping for configuration parameters which are applicable to all address families of the BGP router."; // Aggregate related uses bgp-aggregate-addr; // Aggregate Timer container aggregate-timer { description "Configure aggregation timer to specify time interval at which BGP routes will be aggregated for route aggregation."; leaf enable { type boolean; default "true"; description "Enable aggregate timer"; } leaf threshold { type uint16 { range "6..60"; } description "Threshold value in seconds"; } } Patel, et al. Expires January 9, 2017 [Page 10] Internet-Draft Yang Data Model for BGP extended features July 2016 //Network container network { description "Add networks to BGP table"; leaf network { type inet:ip-address; description "Specify a network to announce via BGP."; } leaf policy { type string; //TBD leaf to policy model. description "Modify route attribute as per policy"; } } // Dampening uses bgp-dampening-params; //Other leafs leaf auto-summary { type boolean; description "Enable automatic network number summarization"; } // Best external leaf advertise-best-external { type boolean; description "Advertise best external path to the internal peers."; } } // Global mode extensions can go here. grouping bgp-gbl-extension-cfg { description "BGP process global extensions grouping"; // BGP process global extensions here. } // Global address family specific extensions. grouping bgp-gbl-af-extension-cfg { description "BGP global address family specific extensions"; //AF extensions common to all AFs uses bgp-af-extension-cfg; } // Neighbor mode extensions. grouping bgp-nbr-extension-cfg { Patel, et al. Expires January 9, 2017 [Page 11] Internet-Draft Yang Data Model for BGP extended features July 2016 description "BGP neighbor specific extensions"; //NBR extensions go here uses bgp-dmz-link-bw; } // Neighbor address family specific extensions. grouping bgp-nbr-af-extension-cfg { description "BGP neighbor address-family specific extensions"; // NBR-AF extensions go here uses bgp-aigp ; uses soft-reconfig; } //----------------------------------- // Augment BGP model in various places. //------------------------------------ // BGP Global parameters augment "/bgp:bgp/bgp:global" { description "BGP global mode specific extensions"; //add BGP global extensions here uses bgp-gbl-extension-cfg; } // BGP Global Address Family Specific augment "/bgp:bgp/bgp:global/bgp:afi-safis/bgp:afi-safi" { description "BGP global address family mode specific extensions"; //add BGP global AF extensions here uses bgp-gbl-af-extension-cfg; } //BGP Neighbor Specific augment "/bgp:bgp/bgp:neighbors/bgp:neighbor" { description "BGP neighbor mode specific extensions"; // add nbr specific extensions here uses bgp-nbr-extension-cfg; } //BGP Neighbor address-family Specific augment "/bgp:bgp/bgp:neighbors/bgp:neighbor/bgp:afi-safis/bgp:afi-safi" { description "BGP neighbor address family mode specific extensions"; // add nbr AFI-SAFI specific extensions here. uses bgp-nbr-af-extension-cfg; } // BGP Neighbor Groups specific augment "/bgp:bgp/bgp:peer-groups/bgp:peer-group" { Patel, et al. Expires January 9, 2017 [Page 12] Internet-Draft Yang Data Model for BGP extended features July 2016 description "BGP peer-group mode specific extensions"; // add nbr specific extensions here uses bgp-nbr-extension-cfg; } // BGP Neighbor Group address-family Specific. augment "/bgp:bgp/bgp:peer-groups/bgp:peer-group/bgp:afi-safis/bgp:afi-safi" { description "BGP peer-group address family mode specific extensions"; // add nbr AFI-SAFI specific extensions here. uses bgp-nbr-af-extension-cfg; } } 5. IANA Considerations 6. Security Considerations The transport protocol used for sending the BGP configuration data MUST support authentication and SHOULD support encryption. The data- model by itself does not create any security implications. This draft does not change any underlying security issues inherent in the base BGP model [I-D.ietf-idr-bgp-model], that it augments to define yang model for extented features. 7. Acknowledgements The authors would like to thank TBD for their detail reviews and comments. 8. References 8.1. Normative References [I-D.ietf-idr-bgp-model] Shaikh, A., Shakir, R., Patel, K., Hares, S., D'Souza, K., Bansal, D., Clemm, A., Zhdankin, A., Jethanandani, M., and X. Liu, "BGP Model for Service Provider Networks", draft- ietf-idr-bgp-model-01 (work in progress), January 2016. [I-D.ietf-netmod-routing-cfg] Lhotka, L., "A YANG Data Model for Routing Management", draft-ietf-netmod-routing-cfg-15 (work in progress), May 2014. Patel, et al. Expires January 9, 2017 [Page 13] Internet-Draft Yang Data Model for BGP extended features July 2016 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC2439] Villamizar, C., Chandra, R., and R. Govindan, "BGP Route Flap Damping", RFC 2439, DOI 10.17487/RFC2439, November 1998, . [RFC2519] Chen, E. and J. Stewart, "A Framework for Inter-Domain Route Aggregation", RFC 2519, DOI 10.17487/RFC2519, February 1999, . [RFC2547] Rosen, E. and Y. Rekhter, "BGP/MPLS VPNs", RFC 2547, DOI 10.17487/RFC2547, March 1999, . [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, DOI 10.17487/RFC4271, January 2006, . [RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February 2006, . [RFC4760] Bates, T., Chandra, R., Katz, D., and Y. Rekhter, "Multiprotocol Extensions for BGP-4", RFC 4760, DOI 10.17487/RFC4760, January 2007, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC7224] Bjorklund, M., "IANA Interface Type YANG Module", RFC 7224, DOI 10.17487/RFC7224, May 2014, . Patel, et al. Expires January 9, 2017 [Page 14] Internet-Draft Yang Data Model for BGP extended features July 2016 [RFC7311] Mohapatra, P., Fernando, R., Rosen, E., and J. Uttaro, "The Accumulated IGP Metric Attribute for BGP", RFC 7311, DOI 10.17487/RFC7311, August 2014, . 8.2. Informative References [RFC5492] Scudder, J. and R. Chandra, "Capabilities Advertisement with BGP-4", RFC 5492, DOI 10.17487/RFC5492, February 2009, . Authors' Addresses Keyur Patel Cisco 170 W. Tasman Drive San Jose, CA 95134 USA Email: keyupate@cisco.com Dhanendra Jain Cisco 170 W. Tasman Drive San Jose, CA 95134 USA Email: dhjain@cisco.com Susan Hares Huawei 7453 Hickory Hill Saline, MI 48176 USA Email: shares@ndzh.com Patel, et al. Expires January 9, 2017 [Page 15]