The timer lsp-max-age command configures the maximum Keepalive time of an LSP generated by the current IS-IS process.
The undo timer lsp-max-age command restores the default value.
By default, the maximum Keepalive time of an LSP is 1200 seconds.
| Parameter | Description | Value |
|---|---|---|
| age-time | Specifies the maximum Keepalive time of an LSP. | The value ranges from 2 to 65535 seconds. |
Usage Scenario
When generating the system LSP, a router fills in the maximum Keepalive time for this LSP. When other routers receive this LSP, the Keepalive time of the LSP is reduced continuously. If a router does not receive the update LSP, the Keepalive time of the LSP is reduced to 0, the LSP is kept for 60 seconds. If a new LSP is not received in 60 seconds, the router deletes the LSP.
The timer lsp-max-age command can adjust the maximum Keepalive time of an LSP to ensure the validity of old LSPs before the refreshed LSPs are received.
Prerequisites
Before running the timer lsp-max-age command, run the isis command to create an IS-IS process.
Configuration Impact
If the maximum Keepalive time of an LSP is configured too short, the LSP may be lost.
Precautions
The maximum Keepalive time of an LSP must be longer than the LSP refresh interval configured by timer lsp-refresh. Otherwise, the LSP cannot be updated before being deleted.