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Configuring the Link-State PDU Lifetime for IS-IS
By default, link-state PDUs are maintained in network databases for 1200 seconds (20 minutes) before being considered invalid. This length of time, called the LSP lifetime, normally is sufficient to guarantee that link-state PDUs never expire.
To modify the link-state PDU lifetime, include the lsp-lifetime statement:
lsp-lifetime seconds;
For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.
The time can range from 350 through 65,535 seconds.
The link-state PDU refresh interval is derived from the link-state PDU lifetime and is equal to the lifetime minus 317 seconds.
