Dell Force10 S50-01-GE-48T FTOS 8.4.2.7 Configuration Guide for E-Series TeraS - Page 203

To disable BFD for a port-channel: Step 1 Task Disable BFD for a port-channel. Command Syntax Command Mode no bfd enable INTERFACE PORT-CHANNEL 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 (Message 3 on page 179). To enable Protocol Liveness: Step 1 Task Enable Protocol Liveness Command Syntax bfd protocol-liveness Command Mode CONFIGURATION Troubleshooting BFD Examine control packet field values using the command debug bfd detail. Figure 9-29 shows a three-way handshake using this command. Figure 9-29. 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 debug bfd packet. Bidirectional Forwarding Detection | 203