3com 8807 Guida Di Riferimento

level-2: Summarizes the routes imported into backbone area.

Use the summary command to configure to summarize IS-IS routes.

Use the undo summary command to cancel the summarization.

By default, no routes will be summarized.

Similarly, the routes with the same next hops can be summarized into one route. In 
this way, the sizes of the routing table, LSP packets and LSDB are reduced. Among 
them, the summarized route can be either a route found by IS-IS protocol, or an 
imported route. Furthermore, the cost value of the summarized route adopts the 
smallest cost among all the routes summarized.

# Set a summarized route of 202.0.0.0/8.

[3Com-isis] summary 202.0.0.0 255.0.0.0 

timer lsp-max-age seconds

IS-IS view

seconds: Specifies the maximum lifetime of LSP, measured in seconds. The range is 
1 to 65535. The default value is 1200 seconds.

Use the timer lsp-max-age command to configure the maximum lifetime of an 
LSP generated by the current router.

Use the undo timer lsp-max-age command to restore the default value.

When the router generates an LSP for the system, it adds the maximum lifetime to 
it. When other routers receive this LSP, the lifetime of the LSP decreases 
continuously as time goes by. When this value reaches zero, the LSP times out. If 
no update is received before that, the timeout LSP will be deleted from the LSDB.

Related command: timer lsp-refresh.

# Set the lifetime of an LSP generated by the current system to 25 minutes, i.e., 
1500 seconds.

[3Com-isis] timer lsp-max-age 1500 

timer lsp-refresh seconds