Configuring RSVP-TE Hello Messages to Determine Peer Reachability

The RSVP-TE hello feature enables RSVP-TE peers to exchange hello messages and establish a hello adjacency. The peers use the adjacency to verify reachability. When a peer is no longer reachable, the LSPs that traverse the neighbor are torn down.

High refresh values reduce the amount of control traffic (and CPU cycles) needed by RSVP-TE to refresh LSP state across the network, reducing the impact of RSVP-TE on system resources:

To configure the RSVP-TE hello feature on all RSVP-TE interfaces in the VR:

  1. Issue the mpls rsvp signaling hello command.
    host1:vr5(config)#mpls rsvp signaling hello
  2. (Optional) Configure the refresh interval.
    host1(config-if)#mpls rsvp signaling hello refresh interval 5000
  3. (Optional) Configure the refresh misses.
    host1(config-if)#mpls rsvp signaling hello refresh misses 5

To configure the RSVP-TE hello feature on a RSVP-TE specific interface:

  1. Access the interface.
    host1(config)#interface fastEthernet 4/3
  2. Issue the mpls rsvp signaling hello command.
    host1(config-if)#mpls rsvp signaling hello
  3. (Optional) Configure the refresh interval.
    host1(config-if)#mpls rsvp signaling hello refresh interval 5000
  4. (Optional) Configure the refresh misses.
    host1(config-if)#mpls rsvp signaling hello refresh misses 5

    Note: Issuing the refresh interval or the refresh misses keywords only configures the refresh values; this action has no effect on enabling or disabling hellos.

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