Setting The Spf Calculation Interval - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l
----End

7.7.4 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.
Issue 02 (2014-09-30)
2. Run:
isis [ process-id ]
The IS-IS view is displayed.
3. Run:
flash-flood [ lsp-count | max-timer-interval interval | [ level-1 |
*
level-2 ] ]
The LSP fast flooding is enabled.
The flash-flood command speeds up LSP flooding by flooding newly generated or
received LSPs immediately without waiting for the expiry of the timer set using the
isis timer lsp-throttle command.
You can specify lsp-count to flood a certain number of LSPs and specify interval to
flood LSPs at a certain interval. If the number of LSPs to be flooded exceeds the value
of lsp-count, a maximum of lsp-count number of LSPs are flooded each time in time
sequence at an interval specified by interval until all the LSPs are flooded.
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.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7 IS-IS Configuration
553