H3C S3610-28P Operation Manual page 562

Operation Manual – BFD-GR
H3C S3610&S5510 Series Ethernet Switches
Figure 1-1 BFD control packet format
Vers: Protocol version. The protocol version is 1.
Diag: This bit indicates the reason for the last transition of the local protocol from
up to some other state.
Table 1-1 Diag bit values
0
1
2
3
4
5
6
7
8~31
State (Sta): Current BFD session state. Its value can be 0 for AdminDown, 1 for
Down, 2 for Init, and 3 for Up.
Demand (D): If set to 1, it means the transmitting protocol wishes to operate in the
query mode; if set to 0, it means the transmitting protocol ignores the query mode
or cannot operate in the query mode.
Poll (P): If it is set to 1, the transmitting protocol requests the connection
acknowledgement or acknowledges a parameter change. If it is set to 0, the
transmitting protocol does not request the acknowledgement.
Final (F): If it is set to 1, the transmitting protocol responds to a received BFD
control packet that has the Poll (P) bit set. If it is set to 0, the transmitting protocol
does not respond to any received BFD control packet that has the Poll (P) bit set.
Table 1-1 lists the states.
Diag
1-4
Chapter 1 BFD Configuration
Description
No Diagnostic
Control Detection Time Expired
Echo Function Failed
Neighbor Signaled Session Down
Forwarding Pane Reset
Path Down
Concatenated Path Down
Administratively Down
Reserved for future use