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FTOS Configuration Guide for the C-Series - Force10 Networks

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To enable Protocol Liveness:<br />

Step Task Command Syntax Command Mode<br />

1 Enable Protocol Liveness bfd protocol-liveness CONFIGURATION<br />

TroubleShooting BFD<br />

Examine control packet field values using <strong>the</strong> command debug bfd detail. Figure 440 shows a three-way<br />

handshake using this command.<br />

Figure 440 debug bfd detail Command Output<br />

R1(conf-if-gi-4/24)#00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state<br />

to Down <strong>for</strong> neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0)<br />

00:54:38 : Sent packet <strong>for</strong> session with neighbor 2.2.2.2 on Gi 4/24<br />

TX packet dump:<br />

Version:1, Diag code:0, State:Down, Poll bit:0, Final bit:0, Demand bit:0<br />

myDiscrim:4, yourDiscrim:0, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:0<br />

00:54:38 : Received packet <strong>for</strong> session with neighbor 2.2.2.2 on Gi 4/24<br />

RX packet dump:<br />

Version:1, Diag code:0, State:Init, Poll bit:0, Final bit:0, Demand bit:0<br />

myDiscrim:6, yourDiscrim:4, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:0<br />

00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Up <strong>for</strong> neighbor<br />

2.2.2.2 on interface Gi 4/24 (diag: 0)<br />

Examine control packets in hexadecimal <strong>for</strong>mat using <strong>the</strong> command debug bfd packet.<br />

Figure 441 debug bfd packet Command Output<br />

RX packet dump:<br />

20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a0<br />

00 01 86 a0 00 00 00 00<br />

00:34:13 : Sent packet <strong>for</strong> session with neighbor 2.2.2.2 on Gi 4/24<br />

TX packet dump:<br />

20 c0 03 18 00 00 00 04 00 00 00 05 00 01 86 a0<br />

00 01 86 a0 00 00 00 00<br />

00:34:14 : Received packet <strong>for</strong> session with neighbor 2.2.2.2 on Gi 4/24<br />

RX packet dump:<br />

20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a0<br />

00 01 86 a0 00 00 00 00<br />

00:34:14 : Sent packet <strong>for</strong> session with neighbor 2.2.2.2 on Gi 4/24<br />

TX packet dump:<br />

The output <strong>for</strong> <strong>the</strong> command debug bfd event is <strong>the</strong> same as <strong>the</strong> log messages that appear on <strong>the</strong> console<br />

by default.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 625

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