130 | Bidirectional Forwarding Detection (BFD)w w w . d e l l . c o m | s u p p o r t . d e l l . c o m • Troubleshooting BFDConfiguring BFD for Physical PortsConfiguring BFD for Physical Ports is supported on C-Series and E-Series only.BFD on physical ports is useful when no routing protocol is enabled. Without BFD, if the remote systemfails, the local system does not remove the connected route until the first failed attempt to send a packet.When BFD is enabled, the local system removes the route as soon as it stops receiving periodic controlpackets from the remote system.Configuring BFD for a physical port is a two-step process:1. Enable BFD globally.2. Establish a session with a next-hop neighbor.Related configuration tasks• Change session parameters.• Disable or re-enable BFD on an interface.Enabling BFD globallyBFD must be enabled globally on both routers, as shown in the following illustrationTo enable BFD globally:Verify that BFD is enabled globally using the command show running bfd, as shown in the followingfigure.Figure 7-4. Enabling BFD GloballyStep Task Command Syntax Command Mode1 Enable BFD globally. bfd enable CONFIGURATIONR1(conf)#bfd ?enable Enable BFD protocolprotocol-liveness Enable BFD protocol-livenessR1(conf)#bfd enableR1(conf)#do show running-config bfd!bfd enableR1(conf)#BFD Enabled
