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DES-7200 Configuration Guide Chapter 3 BFD Configuration
3-1
3 BFD Configuration
3.1 Understanding BFD
3.1.1 BFD Overview
Bidirectional forwarding detection (BFD) provides low-overhead, short-duration
detection of the connectivity in the forwarding path between adjacent routers.
The fast detection of failures in the forwarding path speeds up enabling the
backup forwarding path and improves the network performance.
3.1.2 BFD Packet Format
The two types of BFD packets are control packets and echo packets. The local
end sends echo packets to the peer, which returns the received echo packets
back without processing. Therefore, no BFD echo packet format is defined.
Only BFD control packet format is defined. There are two versions for the BFD
control packet: version 0 and version 1. By default, the BFD session
establishment adopts the version 1. However, if one end receives the version 0
control packets from the peer, the default version 1 will automatically switch to
version 0 to establish the BFD session. You can use the show bfd neighbors
command to view the version member. The format of the version 1 packet is
shown as follows: