isis csnp-interval seconds [level-1 | level-2]
no isis csnp-interval [level-1 | level-2]
seconds Interval of time between transmission of CSNPs on multiaccess networks. This interval only applies for the designated router. The default is 10 seconds. level-1 (Optional) Configures the interval of time between transmission of CSNPs for Level 1 independently. level-2 (Optional) Configures the interval of time between transmission of CSNPs for Level 2 independently.
To configure the IS-IS complete sequence number PDUs (CSNPs) interval, use the isis csnp-interval command in interface configuration mode. To restore the default value, use the no form of this command.
Level 1 and Level 2
It is very unlikely you will need to change the default value of this command.
This command applies only for the designated router (DR) for a specified interface. Only DRs send CSNP packets in order to maintain database synchronization. The CSNP interval can be configured independently for Level 1 and Level 2. Configuring the CSNP interval does not apply to serial point-to-point interfaces. It does apply to WAN connections if the WAN is viewed as a multiaccess meshed network.
For multiaccess WAN interfaces such as ATM, Frame Relay, and X.25, we highly recommend that you configure the nonbroadcast multiaccess (NBMA) cloud as multiple point-to-point subinterfaces. Doing so will make routing much more robust if one or more permanent virtual circuits (PVCs) fails.
The isis csnp-interval command on point-to-point subinterfaces should be used only in combination with the IS-IS mesh-group feature.
The following example configures Ethernet interface 0 for sending CSNPs every 30 seconds:Router(config)# interface ethernet 0 Router(config-if)# isis csnp-interval 30 level-1
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