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Configuring IPv6 IS-IS
This chapter describes how to configure IPv6 IS-IS, which supports all IPv4 IS-IS features except that it
advertises IPv6 routing information. For information about IS-IS, see "Configuring IS-IS."
T
he term "router" in this chapter refers to both routers and Layer 3 switches.
Hardware compatibility
The A5500 SI Switch Series does not support IPv6 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. 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.
Configuring IPv6 IS-IS basic functions
You can implement IPv6 inter-networking through configuring IPv6 IS-IS in IPv6 network environment.
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.
To configure the basic functions of IPv6 IS-IS:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enable an IS-IS process and
enter IS-IS view.
isis [ process-id ]
Not enabled by default.
3. Configure the network entity
title for the IS-IS process.
network-entity net Not configured by default.
4. Enable IPv6 for the IS-IS
process.
ipv6 enable Disabled by default.
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