Configuring Protocol Liveness; Troubleshooting Bfd - Dell Force10 Z9000 Configuration Manual

Configuring Protocol Liveness

Protocol Liveness is a feature that notifies the BFD Manager when a client protocol is disabled. When a
client is disabled, all BFD sessions for that protocol are torn down. Neighbors on the remote system
receive an Admin Down control packet and are placed in the Down state
To enable Protocol Liveness:
Step Task
1 Enable Protocol Liveness

Troubleshooting BFD

Examine control packet field values using the command
three-way handshake using this command.
Figure 7-29. debug bfd detail Command Output
R1(conf-if-gi-4/24)#00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state
to Down for neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0)
00:54:38 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24
TX packet dump:
Version:1, Diag code:0, State:Down, Poll bit:0, Final bit:0, Demand bit:0
myDiscrim:4, yourDiscrim:0, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:0
00:54:38 : Received packet for session with neighbor 2.2.2.2 on Gi 4/24
RX packet dump:
Version:1, Diag code:0, State:Init, Poll bit:0, Final bit:0, Demand bit:0
myDiscrim:6, yourDiscrim:4, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:0
00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Up for neighbor
2.2.2.2 on interface Gi 4/24 (diag: 0)
Examine control packets in hexadecimal format using the command
Figure 7-30. debug bfd packet Command Output
RX packet dump:
00:34:13 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24
TX packet dump:
00:34:14 : Received packet for session with neighbor 2.2.2.2 on Gi 4/24
RX packet dump:
00:34:14 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24
TX packet dump:
The output for the command
default.
| Bidirectional Forwarding Detection (BFD)
158
20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a0
00 01 86 a0 00 00 00 00
20 c0 03 18 00 00 00 04 00 00 00 05 00 01 86 a0
00 01 86 a0 00 00 00 00
20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a0
00 01 86 a0 00 00 00 00
debug bfd event
Command Syntax
bfd protocol-liveness
debug bfd detail
debug bfd packet
is the same as the log messages that appear on the console by
(Message 3).
Command Mode
CONFIGURATION
. The following example shows a
.