Reference Guide

receives a Down status notification from the remote system, the session state on the local system
changes to Init.
Figure 15. Session State Changes
Important Points to Remember
• Dell Networking OS supports 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.
• 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.
• Dell Networking OS supports only OSPF, IS-IS, BGP, and VRRP protocols as BFD clients.
Configure BFD
This section contains the following procedures.
• Configure BFD for OSPF
• Configure BFD for IS-IS
• Configure BFD for BGP
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Bidirectional Forwarding Detection (BFD)