Configuring the Transmission Frequency for CSNP Packets on IS-IS Interfaces
By default, IS-IS sends complete sequence number (CSN) packets periodically. If the routing device is the designated router on a LAN, IS-IS sends CSN packets every 10 seconds. If the routing device is on a point-to-point interface, it sends CSN packets every 5 seconds. You might want to modify the default interval to protect against link-state PDU (LSP) flooding.
To modify the CSNP interval, include the csnp-interval statement:
csnp-interval seconds;
The time can range from 1 through 65,535 seconds.
To configure the interface not to send any CSN packets, specify the disable option:
csnp-interval disable;
For a list of hierarchy levels at which you can include these statements, see the statement summary sections for these statements.
