Reference Guide

Level-1 Metric Style Level-2 Metric Style Resulting Metric Value
narrow transition original value
wide narrow truncated value
wide narrow transition truncated value
wide wide transition original value
wide transition truncated value
narrow transition wide original value
narrow transition narrow original value
narrow transition wide transition original value
narrow transition transition original value
transition wide original value
transition narrow original value
transition wide transition original value
transition narrow transition original value
wide transition wide original value
wide transition narrow truncated value
wide transition narrow transition truncated value
wide transition transition truncated value
Sample Configurations
The following configurations are examples for enabling IPv6 IS-IS. These examples are not comprehensive directions.
They are intended to give you some guidance with typical configurations.
NOTE: Only one IS-IS process can run on the router, even if both IPv4 and IPv6 routing is being used.
You can copy and paste from these examples to your CLI. To support your own IP addresses, interfaces, names, and so
on, be sure that you make the necessary changes.
NOTE: Whenever you make IS-IS configuration changes, clear the IS-IS process (re-started) using the clear
isis command. The clear isis command must include the tag for the ISIS process. The following example
shows the response from the router:
FTOS#clear isis *
% ISIS not enabled.
FTOS#clear isis 9999 *
You can configure IPv6 IS-IS routes in one of the following three different methods:
• Congruent Topology — You must configure both IPv4 and IPv6 addresses on the interface. Enable the ip
router isis
and ipv6 router isis commands on the interface. Enable the wide-metrics
parameter in router isis configuration mode.
• Multi-topology — You must configure the IPv6 address. Configuring the IPv4 address is optional. You must
enable the ipv6 router isis command on the interface. If you configure IPv4, also enable the router
isis
command. In router isis configuration mode, enable multi-topology under address-family ipv6
unicast.
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