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IPV6 IS-IS CONFIGURATION
n
■ IPv6 IS-IS supports all the features of IPv4 IS-IS except that it advertises IPv6
routing information instead. This document describes only IPv6 IS-IS exclusive
configuration tasks. For other configuration tasks, refer to “IS-IS Configuration”
on page 325.
■ The term “router” in this document refers to a Layer 3 switch running routing
protocols.
When configuring IPv6 IS-IS, go to these sections for information you are
interested in:
■ “Introduction to IPv6 IS-IS” on page 461
■ “Configuring IPv6 IS-IS Basic Functions” on page 461
■ “Configuring IPv6 IS-IS Routing Information Control” on page 462
■ “Displaying and Maintaining IPv6 IS-IS” on page 463
■ “IPv6 IS-IS Configuration Example” on page 464
Introduction to IPv6
IS-IS
The IS-IS routing protocol (Intermediate System-to-Intermediate System
intra-domain routing information exchange protocol) supports multiple network
protocols, including IPv6. IS-IS with IPv6 support is called IPv6 IS-IS dynamic
routing protocol. The international switch fabric task force (IETF) defines two
type-length-values (TLVs) and a new network layer protocol identifier (NLPID) to
enable IPv6 support for IS-IS.
TLV is a variable field in the link state PDU or link state packet (LSP). The two TLVs
are:
■ IPv6 Reachability: Defines the prefix, metric of routing information to indicate
the network reachability, with a type value of 236 (0xEC).
■ IPv6 Interface Address: Similar with the “IP Interface Address” TLV of IPv4, it
transforms the 32-bit IPv4 address to the 128-bit IPv6 address.
NLPID is an 8-bit field with a value of 142 (0x8E), which indicates the network
layer protocol packet. If the IS-IS router supports IPv6, the advertised routing
information must be marked with the NLPID.
Configuring IPv6 IS-IS
Basic Functions
n
You can implement IPv6 inter-networking through configuring IPv6 IS-IS in IPv6
network environment.
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