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Configuring IPv6 IS-IS
Overview
IPv6 IS-IS supports all IPv4 IS-IS features except that it advertises IPv6 routing information. This
chapter describes only IPv6 IS-IS specific configuration tasks. For information about IS-IS, see
"Configuring IS-IS."
Intermediate System-to-Intermediate System (IS-IS) supports multiple network protocols, including
IPv6. To support IPv6, the IETF added two type-length-values (TLVs) and a new network layer
protocol identifier (NLPID).
The TLVs are as follows:
• IPv6 Reachability—Contains routing prefix and metric information to describe 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 new 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 IPv6 IS-IS.
Configuring basic IPv6 IS-IS
Before you configure basic IPv6 IS-IS, complete the following tasks:
• Configure IPv6 addresses for interfaces to ensure IPv6 connectivity between neighboring
nodes.
• Enable IS-IS.
Basic IPv6 IS-IS configuration can implement the interconnection of IPv6 networks.
To configure basic IPv6 IS-IS:
1. Enter system view.
N/A
2. Enable an IS-IS process and
enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
By default, no IS-IS process is
enabled.
3. Configure the network entity
title (NET) for the IS-IS
process.
network-entity
net By default, no NET is configured.
4. Create the IPv6 address
family and enter its view.
address-family ipv6
[
unicast
]
By default, no IS-IS IPv6 address
family exists.
5. Return to IS-IS view.
quit
N/A
6. Return to system view.
quit
N/A
7. Enter interface view.
interface
interface-type
interface-number
N/A
8. Enable IPv6 for IS-IS on the
interface.
isis ipv6 enable
[ process-id ]
By default, IPv6 is disabled for
IS-IS on an interface.
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