Configuring RSVP Summary Refresh

When RSVP summary refresh is enabled on an interface, the device suppresses the sending of unchanged Path and Resv messages (refresh messages) and instead sends a summary message listing the IDs of Path and Resv messages that are to be refreshed.

RFC 2961 extends RSVP to create IDs for RSVP messages. Summary refresh does not affect the sending of RSVP trigger messages that signal changes of state.

RSVP summary refresh is disabled by default for all interfaces. To enable summary refresh on an interface, complete the following steps.

Configure the device.
```
device# configure
```
Enable the MPLS router.
```
device(config)# router mpls
```
Enable MPLS-capable interfaces.
```
device(config-router-mpls)# mpls-interface ethernet 0/13
```
In this example, the ethernet interface 0/13 is specified.

Enable RSVP configuration.

device(config-router-mpls-eth-0/13)# rsvp

Enable RSVP summary refresh reduction feature on an Ethernet interface.
```
device(config-router-mpls-eth-0/13-rsvp)# refresh-reduction summary-refresh
```
This step enables the sending of RSVP summary refresh messages on interface 0/13.

Example

The following example enables summary refresh on Ethernet interface 0/13.

device# configure
device(config)# router mpls
device(config-router-mpls)# mpls-interface ethernet 0/13
device(config-router-mpls-eth-0/13)# rsvp
device(config-router-mpls-eth-0/13-rsvp)# refresh-reduction summary-refresh

When the RSVP neighbor does not support refresh reduction, the interface does not send summary refresh messages, even though the feature is locally enabled. It instead continues to resend full Path and Resv refresh messages. Use the no version of the command to manually disable summary refresh on this interface.