Configuring the RSVP Refresh Interval

To maintain path states and resource reservations on the routers in an LSP, RSVP Path and Resv messages are sent at regular intervals.

Path messages flow downstream in an LSP, from the ingress LER towards the egress LER. Resv messages flow upstream, in the reverse direction of Path messages.

The user can control how often the Path and Resv messages are sent by setting the refresh interval. By default, the refresh interval is 30 seconds. The user can set the refresh interval from 0 through 2147483 seconds.

Complete the following steps to set the refresh interval.

Configure the device.
```
device# configure
```
Enable the MPLS router.
```
device(config)# router mpls
```
Enable configuration of RSVP parameters.
```
device(config-router-mpls)# rsvp
```
Configure average interval between refresh path and reservation messages.
```
device(config-router-mpls-rsvp)# refresh-interval 20
```
In this example, the refresh interval is configured at 20 seconds.

Example

The following example shows setting the refresh interval to 20 seconds.

device# configure
device(config)# router mpls
device(config-router-mpls)# rsvp
device(config-router-mpls-rsvp)# refresh-interval 20