INTERNET-DRAFT Avik Bhattacharya Apratim Mukherjee Intended Status: Proposed Standard Ixia Expires: July 17, 2015 January 13, 2015 Provisioning, Auto-Discovery, and Signaling in L2VPNs for IPv6 Remote PE draft-abhattacharya-l2vpn-signaling-ipv6-remotepe-00 Abstract L2VPN Signaling specification defines the semantic structure of the endpoint identifiers required by each model. It discusses the distribution of these identifiers by the discovery process, especially when discovery is based on the Border Gateway Protocol (BGP). This document updates the end point encoding for BGP-Based Auto-Discovery and suggests a format for NLRI encoding for IPv6 PE Address. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. 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It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." Bhattacharya, et al. Expires July 17, 2015 [Page 1] INTERNET DRAFT L2VPN signaling for IPv6 Remote PE January 13, 2015 The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on July 17, 2015. Copyright and License 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. 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Expires July 17, 2015 [Page 2] INTERNET DRAFT L2VPN signaling for IPv6 Remote PE January 13, 2015 Table of Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . 4 2 BGP NLRI format for the IPv6 PE Address . . . . . . . . . . . . 4 3 Discussion on Route Distinguisher(RD) and Route Target(RT) . . 5 4 Security Considerations . . . . . . . . . . . . . . . . . . . . 5 5 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 6 References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6.1 Normative References . . . . . . . . . . . . . . . . . . . 6 6.2 Informative References . . . . . . . . . . . . . . . . . . 6 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Bhattacharya, et al. Expires July 17, 2015 [Page 3] INTERNET DRAFT L2VPN signaling for IPv6 Remote PE January 13, 2015 1 Introduction RFC 6074 specifies a number of L2VPN provisioning models, and further specifies the semantic structure of the endpoint identifiers required by each model. It discusses the distribution of these identifiers by the discovery process, especially when discovery is based on the Border Gateway Protocol (BGP). It then specifies how the endpoint identifiers are carried in the two signaling protocols that are used to set up PWs, the Label Distribution Protocol (LDP), and the Layer 2 Tunneling Protocol version 3 (L2TPv3). This draft updates the section 3.2.2.1 of RFC 6074 (BGP-Based Auto-Discovery) and suggests a format for NLRI encoding for IPv6 PE Address. 1.1 Terminology 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 BGP NLRI format for the IPv6 PE Address RFC 6074 Section 3.2.2.1 defines the BGP advertisement for a particular VSI at a given PE will contain: o an NLRI of AFI = L2VPN, SAFI = VPLS, encoded as RD:PE_addr o a BGP next hop equal to the loopback address of the PE o an Extended Community Attribute containing the VPLS-id o an Extended Community Attribute containing one or more RTs. The format for the NLRI encoding defined in RFC 6074 Section 3.2.2.1 is: +------------------------------------+ | Length (2 octets) | +------------------------------------+ | Route Distinguisher (8 octets) | +------------------------------------+ | PE_addr (4 octets) | +------------------------------------+ In this format the size of the PE_addr is defined as 4 octets which can carry only IPv4 addresses. In a situation where the route is originating from a BGP end point running on an IPv6 address, the Bhattacharya, et al. Expires July 17, 2015 [Page 4] INTERNET DRAFT L2VPN signaling for IPv6 Remote PE January 13, 2015 PE_addr in the NLRI needs to carry that IPv6 address. The updated format for the NLRI encoding is: +------------------------------------+ | Length (2 octets) | +------------------------------------+ | Route Distinguisher (8 octets) | +------------------------------------+ | PE_addr (4 or 16 octets) | +------------------------------------+ The length field MUST contain the sum of the length of the Length field(2), the length of the Route Distiguisher(8) and the length of the 4 or 16 octet PE_addr field. The type of the PE_addr can be derived by the receiving node by subtracting the fixed length of the Route Distinguisher and the Length field from the value of the received Length. This PE_addr should be used to initiate adjacency of the underlying signaling protocol if it supports IPv6 endpoints.(such as LDPv6) 3 Discussion on Route Distinguisher(RD) and Route Target(RT) Note that RD and RT can be in format AS 2byte + 4 byte Assigned Number or IP 4 byte + 2 byte Assigned Number. Just like RD or RT cannot carry 4 byte AS numbers , they also cannot utilize 16 byte IPv6 Address. Updates to RD and RT to operate in a pure IPv6 environment is outside the scope of this document. 4 Security Considerations There is no additional security impact in addition to what is mentioned in RFC6074. 5 IANA Considerations No new IANA considerations are introduced in this specifications. Bhattacharya, et al. Expires July 17, 2015 [Page 5] INTERNET DRAFT L2VPN signaling for IPv6 Remote PE January 13, 2015 6 References 6.1 Normative References [RFC6074] E. Rosen, B. Davie, "Provisioning, Auto-Discovery, and Signaling in Layer 2 Virtual Private Networks (L2VPNs)", BCP 74, RFC 6074, January 2011, . 6.2 Informative References [RFC4364] E. Rosen, "BGP/MPLS IP Virtual Private Networks (VPNs)", BCP 78, RFC 4364, February 2006, . Authors' Addresses Avik Bhattacharya Ixia Infinity Building, Tower 2, Floor -4 Sector 5, Saltlike, Kolkata, West Bengal, India - 700091. EMail: abhattacharya@ixiacom.com Apratim Mukherjee Ixia Infinity Building, Tower 2, Floor -4 Sector 5, Saltlike, Kolkata, West Bengal, India - 700091. EMail: amukherjee@ixiacom.com Bhattacharya, et al. Expires July 17, 2015 [Page 6]