Bfd Packet Format - Dell S6100 Configuration Manual

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 11. BFD in IPv4 Packet Format
Field Description
Diagnostic Code The reason that the last session failed.
State The current local session state. Refer to
Flag 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
132 Bidirectional Forwarding Detection (BFD)
NOTE: Dell Networking OS does not currently support multi-point sessions, Demand mode,
authentication, or control plane independence; these bits are always clear.
BFD Sessions.
BFD Sessions).