Reference Guide

Bidirectional Forwarding Detection (BFD) | 153
Figure 8-3. BFD State Machine
Important Points to Remember
• FTOS supports a maximum of 128 sessions per stack unit at 200 minimum transmit and receive
intervals with a multiplier of 3, and 64 sessions at 100 minimum transmit and receive intervals with a
multiplier of 4.
• BFD must be enabled on both ends of a link.
• Demand mode, authentication, and the Echo function are not supported.
• BFD is not supported on multi-hop and virtual links.
• Protocol Liveness is supported for routing protocols only.
• FTOS supports only OSPF, IS-IS, BGP, and VRRP protocols as BFD clients.
Configuring Bidirectional Forwarding Detection
The remainder of this chapter is divided into the following sections:
• Configuring BFD for Physical Ports
• Configuring BFD for Static Routes
• Configuring BFD for OSPF
• Configuring BFD for IS-IS
• Configuring BFD for BGP
• Configuring BFD for VRRP
• Configuring BFD for VLANs
• Configuring BFD for Port-Channels
• Configuring Protocol Liveness
• Troubleshooting BFD
Down
Init
Up
Up, Admin Down, Timer
Init
Down
Admin Down,
Timer
Admin Down,
Down,
Timer
Down
Init, Up
Up, Init
the packet received
current session state