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# Configuring the BFD Protocol for RSVP-TE

Configure the Bidirectional Forwarding Detection (BFD) protocol for RSVP-TE to more rapidly detect failures in a network and enable faster rerouting around the failures. You can modify the BFD timers for more or less aggressive failure detection.

When configured, BFD liveness detection is established with all BFD-enabled RSVP-TE peers associated with that RSVP-TE major interface.

| Note: Before the router can use the mpls rsvp bfd-liveness-detection command, you must specify a BFD license key. To view an already configured license, use the show license bfd command.

To enable BFD (bidirectional forwarding detection) on an RSVP-TE major interface:

1. Access the interface.
   `
   host1(config)#interface fastEthernet 4/3
   `
2. Enable BFD liveness detection.
   `
   host1(config-if)#mpls rsvp bfd-liveness-detection
   `

The peers in an RSVP-TE adjacency use the BFD timer values to negotiate the actual transmit intervals for BFD packets.

- Use the minimum-transmit-interval keyword to specify the interval at which the local peer proposes to transmit BFD control packets to the remote peer.
  `
  host1(config-if)#mpls rsvp bfd-liveness-detection minimum-transmit-interval 400
  `
- Use the minimum-receive-interval keyword to specify the minimum interval at which the local peer must receive BFD control packets from the remote peer.
  `
  host1(config-if)#mpls rsvp bfd-liveness-detection minimum-receive-interval 400
  `
- Use the minimum-interval keyword to specify the same value for both the transmit and receive intervals. Configuring a minimum interval has the same effect as configuring the minimum receive interval and the minimum transmit interval to the same value.
  `
  host1(config-if)#mpls rsvp bfd-liveness-detection minimum-interval 400
  `
- Use the multiplier keyword to specify the detection multiplier value, which roughly equivalent to the number of packets that can be missed before the BFD session is declared to be down. The calculated BFD liveness detection interval can be different on each peer.
  `
  host1(config-if)#mpls rsvp bfd-liveness-detection multiplier 15
  `

  | Note: You can change the BFD liveness detection parameters at any time without stopping or restarting the existing session; BFD automatically adjusts to the new parameter value. However, no changes to BFD parameters take place until the values resynchronize with each peer.

#### Related Topics

- For details on liveness detection negotiation, see Negotiation of the BFD Liveness Detection Interval in the JUNOSe IP Services Configuration Guide
- Basic MPLS Configuration Tasks
- Additional RSVP-TE Configuration Tasks
- mpls rsvp bfd-liveness-detection

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