Configuring Hello Acknowledgments for Nonsession RSVP Neighbors
The hello-acknowledgements statement controls the hello acknowledgment behavior between RSVP neighbors regardless of whether or not they are in the same session.
Hello messages received from RSVP neighbors that are not part of a common RSVP session are discarded. If you configure the hello-acknowledgements statement at the [edit protocols rsvp] hierarchy level, hello messages from nonsession neighbors are acknowledged with a hello acknowledgment message. When hellos are received from nonsession neighbors, an RSVP neighbor relationship is created and periodic hello messages can now be received from the nonsession neighbor. The hello-acknowledgements statement is disabled by default. Configuring this statement allows RSVP-capable routers to be discovered using hello packets and verifies that the interface is able to receive RSVP packets before sending any MPLS LSP setup messages.
Once you enable hello acknowledgments for nonsession RSVP neighbors, the router continues to acknowledge hello messages from any nonsession RSVP neighbors unless the interface itself goes down or you change the configuration. Interface-based neighbors are not automatically aged out.
You can include this statement at the following hierarchy levels:
- [edit protocols rsvp]
- [edit logical-systems logical-system-name protocols rsvp]
