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Configuring the RSVP Hello Interval

RSVP monitors the status of the interior gateway protocol (IGP) (IS-IS or OSPF) neighbors and relies on the IGP protocols to detect when a node fails. If an IGP protocol declares a neighbor down (because hello packets are no longer being received), RSVP also brings down that neighbor. However, the IGP protocols and RSVP still act independently when bringing a neighbor up.

For Juniper Networks routers, configuring a shorter or longer RSVP hello interval has no impact on whether or not an RSVP session is brought down. RSVP sessions are kept up even if RSVP hello packets are no longer being received. RSVP sessions are maintained until either the router stops receiving IGP hello packets or the RSVP Path and Resv messages time out.

However, the RSVP hello interval might impact when another vendor’s equipment brings down an RSVP session. For example, a neighboring non-Juniper Networks router might be configured to monitor RSVP hello packets.

To modify how often RSVP sends hello packets, include the hello-interval statement:




hello-interval seconds;

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

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