IS-IS Configuration Overview

For IS-IS to operate on an interface:

• IS-IS must be enabled on the device using router isis
• The network entity title (NET) must be configured using net
• An IPv4 address must be configured on the interface using ip address or an IPv6 address must be configured on the interface using ipv6 address

By default, IS-IS configuration applies to both IPv4 and IPv6 routes. With the above items configured, use address-family to configure IPv6 specific configuration on the device. IPv6 unicast specific IS-IS configuration currently supports:

• Administrative distance using distance (IS-IS)
• Redistribution of routes from other protocols into IS-IS using redistribute
• Address summarization using summary-address

For IPv6 routing, IPv6 IS-IS must be enabled on the interface using ipv6 router isis.