Command Reference Guide

294 ● summary 3Com Router 5000 Family and Router 6000 Family
Command Reference
summary
Purpose Use the summary command to configure IS-IS route summary.
Use the undo summary command to cancel the summary.
Syntax summary ip-address mask [ level-1 | level-1-2 | level-2 ]
undo summary ip-address mask [ level-1 | level-1-2 | level-2 ]
Parameters ip-address
Address segment of the routes to be aggregated.
mask
Aggregated route mask.
level-1
Aggregates the routes redistributed into Level-1.
level-1-2
Aggregates the routes redistributed to both areas and
backbone network.
level-2
Aggregates the routes redistributed to backbone
network only.
Default By default, no routes will be summarized.
Example Set a route summary of 202.0.0.0/8.
[3Com -isis] summary 202.0.0.0 255.0.0.0
View This command can be used in the following views:
■ S-IS view
Description Similarly, the routes with the same next hops can be aggregated into one route. In
this way, the sizes of the routing table, LSP packets and LSDB are reduced. Among
them, the aggregated route can be either a route found by IS-IS protocol, or an
redistributed route. Furthermore, the cost value of the aggregated route adopts the
smallest cost of the routes aggregated.