System information

Configuring IS-IS
10-13
By default, IS-IS sends CSN packets periodically. If the BSR is the designated router
on a LAN, IS-IS sends CSN packets every 10 seconds. If the BSR is on a
point-to-point interface, it sends CSN packets every 3600 seconds (once an hour).
Depending on your network topology you may want to modify the default interval to
protect against LSP flooding.
Use the isis csnp-interval command in Interface Configuration mode to adjust the
IS-IS CSNP interval for intranet connections if the intranet is a part of a multiaccess
meshed network on the interface, as shown below:
MOT(config-if)#isis csnp-interval <seconds> {level-1 | level-2}
where:
seconds is the ISIS CSNP interval from 1 to 65535 seconds.
level-1 indicates that the interface is a Level 1 IS-IS interface.
level-2 indicates that the interface is a Level 2 IS-IS interface.
Setting the LSP Interval
IS-IS Link-state PDUs (LSPs) hold information about the state of adjacencies to
neighboring IS-IS systems. LSPs are flooded periodically throughout an area.
Use the isis lsp-interval command in Interface Configuration mode to configure the
time delay between successive link state packet (LSP) transmissions, as shown below:
MOT(config-if)#isis lsp-interval <milliseconds>
where:
milliseconds is the time delay between successive LSPs from 1 to 65535
milliseconds.