Setting The Spf Calculation Interval - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
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6.8.4 Setting the SPF Calculation Interval

To improve the fault location efficiency on an IS-IS network and prevent SPF calculation from
consuming excessive system resources, set the SPF calculation interval to a proper value.
Context
A network change always triggers IS-IS to perform SPF calculation. Frequent SPF calculation
will consume excessive CPU resources, affecting services.
To solve this problem, configure an intelligent timer to control the interval for SPF calculation.
For example, to speed up IS-IS route convergence, set the interval for SPF calculation to a small
value, and set the interval to a large value after the IS-IS network becomes stable.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
isis [ process-id ]
The IS-IS view is displayed.
Step 3 Run:
timer spf max-interval [ init-interval [ incr-interval ] ]
The SPF intelligent timer is configured.
The intelligent timer changes as follows:
l The delay for the first SPF calculation is determined by init-interval; the delay for the second
Issue 01 (2012-03-15)
When LSP fast flooding is enabled, Level-1 LSPs and Level-2 LSPs are fast flooded
by default if no level is specified.
Set an interval at which LSPs are retransmitted over a P2P link.
1. Run:
system-view
The system view is displayed.
2. Run:
interface interface-type interface-number
The interface view is displayed.
3. (Optional) Run:
isis circuit-type p2p
Emulate a broadcast interface to the P2P interface.
4. Run:
isis timer lsp-retransmit retransmit-interval
The interval at which LSPs are retransmitted over a P2P link is set.
SPF calculation is determined by incr-interval. From the third time on, the delay in SPF
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6 IS-IS Configuration
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