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DES-7200 Configuration Guide Chapter 3 BFD Configuration
3-2
Figure-1 BFD Control Packet Format
z Vers: BFD version. The current version is 1.
z Diags: The reasons for the last transition of the local protocol from UP to
some other state, including:
0—no diagnostic information
1—detection timeout of the control packets
2—echo failure
3—adjacency advertisement session is Down
4—reset the forwarding panel
5—channel failure
6—channel connection failure
7—AdminDown
z Sta: Current BFD session state. Its value can be 0 for AdminDown, 1 for
Down, 2 for Init and 3 for Up.
z P: When the parameter changes, the sender offsets the Poll(P) bit in the
BFD packet and the receiver must response to this packet immediately.
z F: It must be offset in the echo packet of responding the Poll(P) bit offset.
z C: The forwarding/control separation bit. Once it is offset, the change of
control panel has no influence on the BFD detect. For example, BFD is
able to go on detecting the link state if OSPF(the control panel)
reloads/GR.
z A: Authentication identifier. Offset means the session needs to be verified.
If it is set to 1, the control packet contains the authentication field and the
session is authenticated.
z D: Inquiry demand. Offset means the sender expects to detect the links in
the inquiry demand mode.
z M: Used in the one-to-multiple application and must be set to 0.
z Detect Mult: Detect the timeout multiplier, used to calculate the detection
timeout time for the detector.
z Length: the packet length.
z My Discriminator: the local discriminator connecting the BFD session.
z Your Discriminator: the peer discriminator connecting the BFD session.