By default the Complete Sequence Numbers PDU (CSNP) interval is 10 seconds. The following task configures CSNP interval of 25 seconds for Level 1 and Level 2 packets.
device# configure terminal
device(config)# router isis
device(config-isis-router)# csnp-interval 25
The following example configures a CSNP interval of 25 seconds.
device# configure terminal device(config)# router isis device(config-isis-router)# csnp-interval 25