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Configuring the Revert Timer

For LSPs configured with both primary and secondary paths, it is possible to configure the revert timer. If a primary path goes down and traffic is switched to the secondary path, the revert timer specifies the amount of time (in seconds) that the LSP must wait before it can revert traffic back to a primary path. If during this time, the primary path experiences any connectivity problems or stability problems, the timer is restarted.

The JUNOS software also makes a determination as to which path is the preferred path. The preferred path is the path which has not encountered any difficulty in the last revert timer period. If both the primary and secondary paths have encountered difficulty, neither path is considered preferred. However, if one of the paths is dynamic and the other static, the dynamic path is selected as the preferred path.

The range of values you can configure for the revert timer is 0 through 65,535 seconds. The default value is 60 seconds.

If you configure a value of 0 seconds, the traffic on the LSP, once switched from the primary path to the secondary path, remains on the secondary path permanently (until the network operator intervenes or until the secondary path goes down).

You can configure the revert timer for all LSPs on the router at the [edit protocols mpls] hierarchy level or for a specific LSP at the [edit protocols mpls label-switched-path lsp-name] hierarchy level.

To configure the revert timer, include the revert-timer statement:




revert-timer seconds;

For a list of hierarchy levels at which you can include this statement, see the summary section for this statement.

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