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Sample Configuration
The following configurations are examples for enabling IPv6 IS-IS. These are not comprehensive
directions. They are intended to give you a some guidance with typical configurations.
You can copy and paste from these examples to your CLI. Be sure you make the necessary changes to
support your own IP Addresses, Interfaces, Names, etc.
Figure 27-10 is a sample configuration for enabling IPv6 IS-IS. Figure 27-13 illustrates the topology
created with that CLI configuration.
IPv6 IS-IS routes can be configured in one of the following three different methods:
• Congruent Topology: Both IPv4 and IPv6 addresses
must be configured on the interface. The
commands
ip router isis and ipv6 router isis must be enabled on the interface. You must enable the
wide-metrics parameter in the router isis configuration mode.
• Multi-topology: The IPv6 address
must be configured. Configuring the IPv4 address is optional. The
command
ipv6 router isis must be enabled on the interface. If IPv4 is configured, the command ip router
isis
must also be enabled. In the router isis configuration mode, enable multi-topology under
address-family ipv6 unicast.
• Multi-topology Transition: The IPv6 address
must be configured. Configuring the IPv4 address is
optional. The command
ipv6 router isis must be enabled on the interface. If IPv4 is configured, the
command
ip router isis must also be enabled. In the router isis configuration mode, enable
multi-topology transition under address-family ipv6 unicast.
S
Note: Only one IS-IS process can run on the router, even if both IPv4 and IPv6 routing is
being used.
S
Note: Whenever ISIS configuration changes are made, the IS-IS process must be cleared
(re-started) using the clear isis command. The clear isis command must include the tag for the
ISIS process. The example below shows the response from the router:
FTOS#clear isis *
% ISIS not enabled.
FTOS#clear isis 9999 *
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