Bfd Packet Format - Dell S4048–ON Configuration Manual

S-series 10gbe switches

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BFD Packet Format

Control packets are encapsulated in user datagram protocol (UDP) packets. The following illustration shows the complete

encapsulation of a BFD control packet inside an IPv4 packet.

Figure 13. BFD in IPv4 Packet Format

Diagnostic Code

The reason that the last session failed.

The current local session state. Refer to

A bit that indicates packet function. If the poll bit is set, the receiving system must respond as soon as

possible, without regard to its transmit interval. The responding system clears the poll bit and sets the final

bit in its response. The poll and final bits are used during the handshake and in Demand mode (refer to

Detection Multiplier

The number of packets that must be missed in order to declare a session down.

The entire length of the BFD packet.

NOTE: Dell Networking OS does not currently support multi-point sessions, Demand mode,

authentication, or control plane independence; these bits are always clear.

Bidirectional Forwarding Detection (BFD)