H3C Technologies H3C S7500E Series Switches - Manual (Page 174)

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2) Specify the LSP refresh interval and generation interval
Each router needs to refresh LSPs generated by itself at a configurable interval and send them to other
routers to prevent valid routes from being aged out. A smaller refresh interval speeds up network
convergence but consumes more bandwidth.
When the network topology changes, for example, a neighbor is down/up, or the interface metric,
system ID or area ID is changed, the router generates an LSP after a configurable interval. If such
changes occur frequently, excessive LSPs are generated, consuming a large amount of router
resources and bandwidth; in this case, you can adjust the LSP generation interval.
Follow these steps to specify the LSP refresh interval and generation interval:
To do… Use the command… Remarks
Enter system view system-view ––
Enter IS-IS view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
––
Specify the LSP refresh
interval
timer lsp-refresh seconds
Optional
900 seconds by
default
Specify the LSP generation
interval
timer lsp-generation maximum-interval
[ initial-interval [ second-wait-interval ] ] [ level-1 |
level-2 ]
Optional
2 seconds by default
3) Specify LSP sending intervals
If a change occurs in the LSDB, IS-IS advertises the changed LSP to neighbors. You can specify the
minimum interval for sending such LSPs.
On a P2P link, IS-IS requires an advertised LSP be acknowledged. If no acknowledgement is received
within a configurable interval, IS-IS will retransmit the LSP.
Follow these steps to configure LSP sending intervals:
To do… Use the command… Remarks
Enter system view system-view ––
Enter interface view
interface interface-type
interface-number
––
Specify the minimum interval for
sending LSPs and the maximum
LSP number that can be sent at a
time
isis timer lsp time [ count
count ]
Optional
By default, the minimum interval is 33
milliseconds, and the maximum LSP
number that can be sent at a time is 5.
Specify the LSP retransmission
interval on a P2P link
isis timer retransmit seconds
Optional
5 seconds by default