Users Guide

Session State Changes
The following illustration shows how the session state on a system changes based on the status notification it
receives from the remote system. For example, if a session on a system is down and it receives a Down status
notification from the remote system, the session state on the local system changes to Init.
Figure 12. Session State Changes
Important Points to Remember
• On the switch, the system supports 128 sessions 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.
• Enable BFD 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.
• The switch supports only OSPF, IS-IS, and VRRP protocols as BFD clients; BGP is not supported.
Bidirectional Forwarding Detection (BFD) 170