Configure BFD Basic Functions

Configuration Condition

Before configuring the BFD basic functions, first complete the following tasks:

Configure the IP address of the interface, making the neighboring node network layer reachable
Configure the upper-layer application associated with BFD

Table 10–2 Configure the minimum sending interval of BFD control packets

Step	Command	Description
Enter the global configuration mode	configure terminal	-
Enter the interface configuration mode	interface interface-name	-
Configure the minimum sending interval of BFD control packets	bfd min-transmit-interval value	Optional By default, the minimum sending interval of BFD control packets is 1000ms.

The actual sending interval of the local BFD packets = MAX (minimum sending interval of the local BFD control packets, the minimum receiving interval of the peer BFD control packets)
In the interface mode, configure the minimum sending interval of the BFD control packet to take effect only for the single-hop IP session.

Table 10–3 Configure the minimum receiving interval of the BFD control packet

Step	Command	Description
Enter the global configuration mode	configure terminal	-
Enter the interface configuration mode	interface interface-name	-
Configure the minimum receiving interval of the BFD control packet	bfd min-receive-interval value	Optional By default, the minimum receiving interval of the BFD control packets is 1000ms.

The actual sending interval of the peer BFD control packets = MAX (minimum sending interval of the peer BFD control packets, the minimum receiving interval of the local BFD control packets)
In the interface mode, configure the minimum receiving interval of the BFD control packet to take effect only for the single-hop IP session.

Table 10–4 Configure the detection timeout multiples of the BFD session

Step	Command	Description
Enter the global configuration mode	configure terminal	-
Enter the interface configuration mode	interface interface-name	-
Configure the detection timeout multiples of the BFD session	bfd multiplier value	Optional By default, the detection timeout multiples of the BFD session is 5.

To ensure the validity of the BFD session detection, be careful to configure the minimum of the BFD detection timeout multiples.
Local BFD actual detection time = the detection timeout multiples of the peer BFD session × the actual sending interval of the peer BFD packet
In the interface mode, configure the detection timeout multiples of the BFD control packet to take effect only for the single-hop IP session.

Table 10–5 Configure the fast detection function of the BFD session

Step

Command

Description

Enter the global configuration mode

configure terminal

Configure the fast detection function of the BFD session

bfd fast-detect

Optional

By default, the fast detection function of the BFD session is disabled.