Internet Engineering Task Force (IETF) J. Harrison
Request for Comments: 6119 J. Berger
Category: Standards Track M. Bartlett
ISSN: 2070-1721 Metaswitch Networks
IPv6 Traffic Engineering in IS-IS
This document specifies a method for exchanging IPv6 traffic
engineering information using the IS-IS routing protocol. This
information enables routers in an IS-IS network to calculate traffic-
engineered routes using IPv6 addresses.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
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and how to provide feedback on it may be obtained at
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Harrison, et al. Standards Track [Page 1]RFC 6119 IPv6 Traffic Engineering in IS-IS February 2011
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The IS-IS routing protocol is defined in [IS-IS]. Each router
generates a Link State PDU (LSP) that contains information describing
the router and the links from the router. The information in the LSP
is encoded in a variable length data structure consisting of a Type,
Length, and Value. Such a data structure is referred to as a TLV.
[TE] and [GMPLS] define a number of TLVs and sub-TLVs that allow
Traffic Engineering (TE) information to be disseminated by the IS-IS
protocol [IS-IS]. The addressing information passed in these TLVs is
[IPv6] describes how the IS-IS protocol can be used to carry out
Shortest Path First (SPF) routing for IPv6. It does this by defining
IPv6-specific TLVs that are analogous to the TLVs used by IS-IS for
carrying IPv4 addressing information.
Multiprotocol Label Switching (MPLS) traffic engineering is very
successful, and, as the use of IPv6 grows, there is a need to be able
to support traffic engineering in IPv6 networks.
This document defines the TLVs that allow traffic engineering
information (including Generalized-MPLS (GMPLS) TE information) to be
carried in IPv6 IS-IS networks.
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 [KEYWORDS].
Harrison, et al. Standards Track [Page 2]RFC 6119 IPv6 Traffic Engineering in IS-IS February 20113. Summary of Operation3.1. Identifying IS-IS Links Using IPv6 Addresses
Each IS-IS link has certain properties -- bandwidth, shared risk link
groups (SRLGs), switching capabilities, and so on. The IS-IS