Configuring IS-IS route summarization
Perform this task to summarize specific routes, including IS-IS routes and redistributed routes, into a single route. Route summarization can reduce the routing table size and the LSDB scale.
Route summarization applies only to locally generated LSPs. The cost of the summary route is the lowest one among the costs of the more-specific routes.
To configure route summarization:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter IS-IS IPv4 unicast address family view. | isis [ process-id ] [ vpn-instance vpn-instance-name ] cost-style { wide | wide-compatible } address-family ipv4 [ unicast ] | N/A |
3. Configure IS-IS route summarization. | summary ip-address { mask-length | mask } [ avoid-feedback | generate_null0_route | [ level-1 | level-1-2 | level-2 ] | tag tag ] * | By default, route summarization is not configured. |