Level-1 Metric Style Level-2 Metric Style Resulting Metric Valuewide transition truncated valuenarrow transition wide original valuenarrow transition narrow original valuenarrow transition wide transition original valuenarrow transition transition original valuetransition wide original valuetransition narrow original valuetransition wide transition original valuetransition narrow transition original valuewide transition wide original valuewide transition narrow truncated valuewide transition narrow transition truncated valuewide transition transition truncated valueSample ConfigurationsThe following configurations are examples for enabling IPv6 IS-IS. These examples are not comprehensive directions. They are intended togive 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 youmake 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 therouter: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 ipv6router 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 routerisis 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 theipv6 router isis command on the interface. If you configure IPv4, also enable the ip router isis command. In router isisconfiguration mode, enable multi-topology transition under address-family ipv6 unicast.Intermediate System to Intermediate System 461
