Control Packet Format - Alcatel-Lucent 7450 ESS Series Configuration Manual

Control Packet Format

The BFD control packet has 2 sections, a mandatory section and an optional authentication section.
0
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Vers |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Table 4: BFD Control Packet Field Descriptions
Field
Vers
Diag
D Bit
P Bit
F Bit
Rsvd
Page 50
1
Diag |Sta|P|F|C|A|D|R|
My Discriminator
Your Discriminator
Desired Min TX Interval
Required Min RX Interval
Required Min Echo RX Interval
Figure 9: Mandatory Frame Format
The version number of the protocol. The initial protocol version is 0.
A diagnostic code specifying the local system's reason for the last transition of the
session from Up to some other state.
Possible values are:
0-No diagnostic
1-Control detection time expired
2-Echo function failed
3-Neighbor signaled session down
4-Forwarding plane reset
5-Path down
6-Concatenated path down
7-Administratively down
The "demand mode" bit. (Not supported)
The poll bit. If set, the transmitting system is requesting verification of connectiv-
ity, or of a parameter change.
The final bit. If set, the transmitting system is responding to a received BFD control
packet that had the poll (P) bit set.
Reserved bits. These bits must be zero on transmit and ignored on receipt.
2
Detect Mult | Length
Description
7450 ESS OS Router Configuration Guide
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