Reference Guide

lsp-mtu
Set the maximum transmission unit (MTU) of IS-IS link-state packets (LSPs). This command only limits the size of LSPs
this router generates.
S4820T
Syntax
lsp-mtu size
To return to the default values, use the no lsp-mtu command.
Parameters
size The maximum LSP size, in bytes. The range is from 128 to 1497 for
Non-Jumbo mode and from 128 to 9195 for Jumbo mode. The default
is 1497.
Defaults 1497 bytes.
Command Modes ROUTER ISIS
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
Version 7.5.1.0 Added support for LSP Throttling Enhancement.
Usage
Information
The link MTU and the LSP MTU size must be the same.
Because each device can generate a maximum of 255 LSPs, consider carefully whether you
use the lsp-mtu command.
lsp-refresh-interval
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 is purged.
S4820T
Syntax
lsp-refresh-interval seconds
To restore the default refresh interval, use the no lsp-refresh-interval command.
Parameters
seconds The LSP refresh interval, in seconds. This value has to be less than
the seconds value specified with the max-lsp-lifetime
command. The range is from 1 to 65535 seconds. The default is 900.
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