Reference Guide

930 | Intermediate System to Intermediate System (IS-IS)
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Usage
Information
The link MTU and the LSP MTU size must be the same.
Since each device can generate a maximum of 255 LSPs, consider carefully whether the lsp-mtu
command should be configured.
lsp-refresh-interval
e
Set the link state PDU (LSP) refresh interval. LSPs must be refreshed before they expire. When the
LSPs are not refreshed after a refresh interval, they are kept in a database until their max-lsp-lifetime
reaches zero and then LSPs will be purged.
Syntax
lsp-refresh-interval seconds
To restore the default refresh interval, enter no lsp-refresh-interval.
Parameters
Defaults
900 seconds
Command Modes
ROUTER ISIS
Command
History
Usage
Information
The refresh interval determines the rate at which route topology information is transmitted preventing
the information from becoming obsolete.
The refresh interval must be less than the LSP lifetime specified with the max-lsp-lifetime command.
A low value reduces the amount of time that undetected link state database corruption can persist at the
cost of increased link utilization. A higher value reduces the link utilization caused by the flooding of
refreshed packets.
Related
Commands
max-area-addresses
e
Configure manual area addresses.
Syntax
max-area-addresses number
To return to the default values, enter no max-area-addresses.
seconds
The LSP refresh interval, in seconds. This value has to be less than the seconds
value specified with the max-lsp-lifetime command.
Range: 1 to 65535 seconds.
Default: 900
Version 8.3.19.0 Introduced on S4820T
Version 8.3.12.0 Introduced on S4810
Version 7.5.1.0 Expanded to support LSP Throttling Enhancement
max-lsp-lifetime Sets the maximum interval that LSPs persist without being refreshed