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3Com Router 3000 Ethernet Family
Configuration Guide
5.2.20 Configuring Lifetime of LSP
When a router generates the LSP of the system, it will fill in the maximum lifetime of this
LSP. When other routers receive this LSP, its life time will be reduced continuously as
the time goes. If updated LSP has not been received before the old one times out, this
LSP will be deleted from the LSDB.
LSP lifetime must be longer than the LSP refresh interval.
Perform the following configuration in IS-IS view.
Table 5-24 Configure lifetime of LSP
Configure lifetime of LSP
Restore the default LSP lifetime
By default, LSP can live for 1200 seconds (20 minutes).
5.2.21 Setting the SPF Calculation Interval
When the LSDB of IS-IS changes, the router needs to recalculate the shortest path. If
the shortest path is recalculated upon each change, it will occupy a large amount of
router resource and affect router efficiency. After SPF calculation interval is set, when
LSDB changes, the system will wait if SPF calculation interval timer is not timeout, and
SPF algorithm will not be performed until timeout.
Perform the following configuration in IS-IS view.
Table 5-25 Set the SPF calculation interval
Set the SPF calculation interval
Restore the default SPF calculation
interval
If the level is not specified, it defaults to setting SPF calculation interval for Level-1.
By default, the interval of SPF recalculation is 5 seconds.
5.2.22 Setting SPF Fragmented Calculation
Where are many routing entries in a routing table (exceeding 150,000), the SPF
calculation of IS-IS will occupy system resource for long time. In order to avoid this, you
can divide the SPF calculation into slices.
Perform the following configuration in IS-IS view.
Operation
Operation
3Com Corporation
5-18
Chapter 5 Integrated IS-IS Configuration
Command
timer lsp-max-age seconds
undo timer lsp-max-age
Command
timer spf second [ level-1 | level-2 ]
undo timer spf [ level-1 | level-2 ]
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