Users Guide

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:
Dell#clear isis *
% ISIS not enabled.
Dell#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.
• Multi-topology Transition — 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 ip router isis
command. In router isis configuration mode, enable multi-topology transition under address-family ipv6 unicast.
Figure 58. IPv6 IS-IS Sample Topography
IS-IS Sample Configuration — Congruent Topology
IS-IS Sample Configuration — Multi-topology
IS-IS Sample Configuration — Multi-topology Transition
The following is a sample configuration for enabling IPv6 IS-IS.
Dell(conf-if-te-3/17)#show config
!
Intermediate System to Intermediate System 507