Control Packet

When BFD is operating in Asynchronous mode, Control packets are exchanged between the BFD probe session and neighbor to verify communications on the link. Transmit and receive BFD session Control packet intervals can be set to different lengths, and Control packets use the multiplier.

The three configurable Control packet parameters are:

• Minimum transmit interval – Specifies the minimum interval in 50ms increments between the transmission of BFD Control packets.
• Minimum receive interval – Specifies the minimum interval in 50ms increments between received Control packets the BFD Control sessions can support.
• Detection Multiplier – Specifies the value multiplied by the negotiated transmit rate that produces the detection time. The peer will transition the BFD session to the down state if a control packet is not received within the detection time interval.

Use the Control command, in BFD probe configuration mode, to modify Control packet parameters.

This example shows how to set the minimum Control packet transmit and receive intervals to 350ms and the detection time multiplier to 5 for BFD probe bfdProbe1:

System(rw)->configure
System(rw-config)->probe bfdProbe1 bfd
System(su-config-probe-bfd)->control min-tx 350 min-rx 350 multiplier 5
System(su-config-probe-bfd)->