Bidirectional Forwarding Detection | 201Configuring BFD for Port-ChannelsBFD on port-channels is analogous to BFD on physical ports. If no routing protocol is enabled, and aremote system fails, the local system does not remove the connected route until the first failed attempt tosend a packet. If BFD is enabled, the local system removes the route when it stops receiving periodiccontrol packets from the remote system.There is one BFD Agent for VLANs and port-channels, which resides on RP2 as opposed to the otheragents which are on the line card. Therefore, the 100 total possible sessions that this agent can maintain isshared for VLANs and port-channels.Configuring BFD for port-channels is a two-step process:1. Enable BFD globally on all participating routers. See Enabling BFD globally on page 176.2. Enable BFD at interface level at both ends of the port-channel. See page 201.Related configuration tasks• Change session parameters. See page 202.• Disable BFD a port-channel. See page 202.Establishing sessions on port-channelsTo establish a session, BFD must be enabled at interface level on both ends of the link, as shown inFigure 9-5. The session parameters do not need to match.Figure 9-27. Establishing Sessions on Port-ChannelsfnC0044mp4/244/24Force10(config-if-range-gi-4/24-5)# port-channel-protocol lacpForce10(config-if-range-gi-4/24-5)# port-channel 1 mode activeForce10(config-if-range-gi-4/24-5)# no shutdownForce10(config-if-range-gi-4/24-5)# interface port-channel 1Force10(config-if-po-1)# ip address 2.2.2.1/24Force10(config-if-po-1)# no shutdownForce10(config-if-po-1)# bfd neighbor 2.2.2.22/12/14/254/254 2/2Port Channel 12444/25Force10(config-if-range-gi-2/1-2)# port-channel-protocol lacpForce10(config-if-range-gi-2/1-2)# port-channel 1 mode activeForce10(config-if-range-gi-2/1-2)# no shutdownForce10(config-if-range-gi-2/1-2)# interface port-channel 1Force10(config-if-po-1)# ip address 2.2.2.2/24Force10(config-if-po-1)# no shutdownForce10(config-if-po-1)# bfd neighbor 2.2.2.1
