H3C Technologies H3C S12500 Series Switches - Manual (Page 36)

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• LSP generation timer—Sets the delay for ISIS-SPB to generate a new version of an LSP in response
to an LSP change. For example, an update occurs because of a change in adjacency, interface
metric value, system ID, or area address.
The LSP generation timer is an exponential generation timer. With this timer, ISIS-SPB quickly responds to
the first events for an LSP and then slows down to protect the CPU from frequent LSP generation.
The LSP generation timer value is derived from the following parameters:
• minimum-interval—Minimum LSP generation interval.
• incremental-interval—Base number for the incremental interval.
• maximum-interval—Maximum LSP generation interval.
When the network is stable, the LSP generation timer is set to the minimum interval for each LSP
generation. When the network is unstable, the LSP generation timer increments by
incremental-interval×2 n-2 (n is the number of generation times) for each LSP generation until the maximum
interval is reached. If an event triggers LSP generation after the maximum interval is reached, the LSP
generation timer re-initiates with the minimum interval.
NOTE:
The network is considered unstable if the interval between consecutive LSP generation events is smaller
than two times the maximum interval.
To tune the LSP refresh interval and the LSP regeneration timer parameters:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter SPBM view. spbm N/A
3. Configure the LSP refresh
interval.
timer lsp-refresh seconds
The default refresh interval is 900
seconds.
4. Configure the LSP
generation timer
parameters.
timer lsp-generation
maximum-interval [ minimum-interval
[ incremental-interval ] ]
Default values for the LSP
generation timer parameters:
• maximum-interval—2 seconds.
• minimum-interval—10
milliseconds.
• incremental-interval—10
milliseconds.
The minimum interval and the
incremental interval must be
shorter than the maximum interval.
Enabling LSP fast-flooding
LSP fast-flooding enables ISIS-SPB to flood the first several LSPs that invoke SPF before SPF computation
is started. This mechanism improves ISIS-SPB convergence time. The number of LSPs that can be fast
flooded is user configurable.
To configure LSP fast-flooding:
Step Command Remarks
1. Enter system view. system-view N/A