H3C Technologies H3C S12500 Series Switches - Manual (Page 358)

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Configuring IPv6 IS-IS
This chapter only describes how to configure IPv6 IS-IS, which supports all IPv4 features except that it
advertises IPv6 routing information. For more information about IS-IS, see "Configuring IS-IS."
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 engineer 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-length field in the link state PDU or link state packet (LSP). The TLVs are as follows:
• 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 that the 32-bit
IPv4 address is translated to the 128-bit IPv6 address.
The NLPID is an 8-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.
Configuring basic IPv6 IS-IS
You can implement IPv6 inter-networking through configuring IPv6 IS-IS in IPv6 network environment.
Configuration prerequisites
Before you configure IPv6 IS-IS basic functions, complete the following tasks:
• Enable IPv6 globally.
• Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
• Enable IS-IS.
Configuration procedure
To configure the basic functions of IPv6 IS-IS:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable an IS-IS process and
enter IS-IS view.
isis [ process-id ] Disabled by default.
3. Configure the network entity
title for the IS-IS process.
network-entity net Not configured by default.