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Usage
LSP throttling slows down the frequency at which LSPs are generated during network instability. Even
Information
though throttling LSP generations slows down network convergence, no throttling can result in a
network not functioning as expected. If network topology is unstable, throttling slows down the
scheduling of LSP generations until the topology regains its stability.
The first generation is controlled by the initial wait interval and the second generation is controlled by
the second wait interval. Each subsequent wait interval is twice as long as the previous one until the
wait interval reaches the maximum wait time specified (interval seconds). Once the network calms
down and there are no triggers for two times the maximum interval, fast behavior is restored (the initial
wait time).
lsp-mtu
e
Set the maximum transmission unit (MTU) of IS-IS link-state packets (LSPs). This command only
limits the size of LSPs generated by this router.
Syntax
lsp-mtu size
To return to the default values, enter no lsp-mtu.
Parameters
size
Defaults
1497 bytes
Command Modes
ROUTER ISIS
Command
Version 7.5.1.0
History
Usage
The link MTU
Information
Since each device can generate a maximum of 255 LSPs, consider carefully whether the
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
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
seconds
The maximum LSP size, in bytes.
Range: 128 to 1497 for non-jumbo mode; 128 to 9195 for jumbo mode.
Default: 1497
Expanded to support LSP Throttling Enhancement
(mtu
command) and the LSP MTU size must be the same
The LSP refresh interval, in seconds. This value has to be less than the seconds
value specified with the
Range: 1 to 65535 seconds.
Default: 900
max-lsp-lifetime
command.
Intermediate System to Intermediate System (IS-IS) | 843
lsp-mtu
max-lsp-lifetime
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