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Configuring the CSNP Interval

By default, IS-IS sends complete sequence number (CSN) packets periodically. If the router is the designated router on a LAN, IS-IS sends CSN packets every 10 seconds. If the router 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 configure these statements, see the statement summary sections for these statements.

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