H3C Technologies H3C S10500 Series Switches - Manual (Page 325)

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IPv6 IS-IS configuration
NOTE:
•
IPv6 IS-IS supports all IPv4 IS-IS features, but advertises IPv6 routing information. This document
describes only IPv6 IS-IS exclusive configuration tasks. For other configuration tasks, see the chapter
“IS-IS configuration.”
• The term router in this document refers to both routers and Layer 3 switches.
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. The international engineer task
force (IETF) defines two type-length-values (TLVs) and a new network layer protocol identifier (NLPID) to
enable IS-IS to support IPv6.
TLV is a variable-length field in the link state PDU or link state packet (LSP). The TLVs include the following:
• IPv6 Reachability: Defines the prefix, metric of routing information to indicate network reachability,
and has a type value of 236 (0xEC).
• IPv6 Interface Address: Same as the “IP Interface Address” TLV in IPv4 ISIS, except the 32-bit IPv4
address is translated to the 128-bit IPv6 address.
The NLPID is an eight-bit field that identifies which network layer protocol is supported. For IPv6, the
NLPID is 142 (0x8E), which must be carried in hello packets sent by a router that supports IPv6 IS-IS.
For more information about IS-IS, see the chapter “IS-IS configuration.”
Configuring IPv6 IS-IS basic functions
NOTE:
You can implement IPv6 inter-networking through configuring IPv6 IS-IS in IPv6 network environment.
Configuration prerequisites
Before the configuration, complete the following tasks:
• Enable IPv6 globally
• Configure IP addresses for interfaces, and ensure all neighboring nodes are reachable
• Enable IS-IS
Configuration procedure
Follow these steps to configure the basic functions of IPv6 IS-IS: