Level-1 Metric Style Level-2 Metric Style Resulting Metric Valuenarrow narrow transition original valuenarrow transition original valuewide narrow truncated valuewide narrow transition truncated valuewide wide transition original 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 notcomprehensive 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 beingused.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) usingthe 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. Enablethe ip router isis and ipv6 router isis commands on the interface. Enable the wide-metrics parameter in router isis configuration mode.424 Intermediate System to Intermediate System
