HPE FlexNetwork HSR6800 series Configuration Manual page 204

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Diag—This bit indicates the reason for the last transition of the local session from up to some
other state. Table 19
Table 19 Diag bit values
Diag
0
1
2
3
4
5
6
7
8
9–31
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State (Sta)—Current BFD session state. Its value can be 0 for AdminDown, 1 for Down, 2 for
Init, and 3 for Up.
•
Poll (P)—If set, the transmitting system is requesting verification of connectivity, or of a
parameter change. If clear, the transmitting system is not requesting verification.
•
Final (F)—If set, the transmitting system is responding to a received BFD control packet that
had the Poll (P) bit set. If clear, the transmitting system is not responding to a Poll.
•
Control Plane Independent(C)—If set, the transmitting system's BFD implementation does
not share fate with its control plane. That is, BFD is implemented in the forwarding plane and
can continue to function through disruptions in the control plane. If clear, the transmitting
system's BFD implementation shares fate with its control plane.
•
Authentication Present (A)—If set, the Authentication Section is present and the session is to
be authenticated.
•
Demand (D)—If set, Demand mode is active in the transmitting system. The system would like
to operate in Demand mode, knows that the session is up in both directions, and is directing the
remote system to stop the periodic transmission of BFD control packets. If clear, Demand mode
is not active in the transmitting system.
•
Reserved (R)—This byte must be set to zero on transmit, and ignored on receipt.
•
Detect Mult—Detection time multiplier.
•
Length—Length of the BFD control packet, in bytes.
•
My Discriminator—A unique, nonzero discriminator value generated by the transmitting
system, used to demultiplex multiple BFD sessions between the same pair of systems.
•
Your Discriminator—It is the discriminator received from the remote system. This field reflects
back the received value of My Discriminator, or is 0 if that value is unknown.
•
Desired Min TX Interval—This is the minimum interval (in milliseconds) that the local system
would like to use when transmitting BFD control packets. The value zero is reserved.
•
Required Min RX Interval—This is the minimum interval (in milliseconds) between received
BFD control packets that this system is capable of supporting. If this value is zero, the
transmitting system does not want the remote system to send any periodic BFD control
packets.
lists the states.
Description
No Diagnostic.
Control Detection Time Expired.
Echo Function Failed.
Neighbor Signaled Session Down.
Forwarding Plane Reset.
Path Down.
Concatenated Path Down.
Administratively Down.
Reverse Concatenated Path Down.
Reserved for future use.
197