3Com MSR 30, MSR 50 manual Timer spf, Related commands timer lsp-max-age, Undo timer spf

1086 CHAPTER 74: IS-IS CONFIGURATION COMMANDS

Parameters seconds: Specifies the LSP refresh interval in seconds, ranging from 1 to 65534.

Description Use the timer lsp-refreshcommand to set the LSP refresh interval.

Use the undo timer lsp-refreshto restore the default.

The default is 900 seconds.

Using this feature, you can keep LSPs in synchronization for the whole area.

Related commands: timer lsp-max-age.

n To refresh LSPs before they are aged out, the interval set by the timer lsp-refreshcommand must be smaller than that set by the timer lsp-max-agecommand.

Examples # Set the LSP refresh interval to 1500 seconds.

<Sysname> system-view

[Sysname] isis

[Sysname-isis-1] timer lsp-refresh 1500

timer spf

Syntax timer spf maximum-interval [ minimum-interval [ incremental-interval ] ]

undo timer spf

View IS-IS view

Parameters maximum-interval: Specifies the maximum interval (in seconds) for SPF calculations, ranging from 1 to 120.

minimum-interval: Specifies the minimum interval (in milliseconds) for SPF calculations, ranging from 10 to 60000.

incremental-interval: Specifies the incremental interval (in milliseconds) for SPF calculations, ranging from 10 to 60000.

Description Use the timer spf command to set the time intervals for ISIS routing calculation.

Use the undo timer spf command to restore the default.

The default IS-IS SPF calculation interval is 10 seconds.

When the network changes are infrequent, the SPF calculation interval decreases to the minimum interval. When the network changes become frequent, the calculation interval is increased by inc-interval*(2n-2), (n is the number of network changes that triggered SPF calculations) until the maximum interval is reached.

With this feature, you can prevent the router from over consumption due to frequent network changes.