Dell Force10 S4820T S4820T Configuration Guide - Page 147

Figure 8-1. BFD in IPv4 Packet Format Bidirectional Forwarding Detection (BFD) | 147 Preamble Start Frame Destination MAC Delimiter Source MAC Ethernet Type (0x888e) IP Packet Padding FCS Version IHL (4) TOS Total Length Flags Frag Offset TTL (255) Protocol Header Checksum Src IP Addr Dest IP Addr Options Padding UDP Packet Source Port Destination Port Length Checksum BFD Control Packet Version (1) Range: 3784 Range: 3784 Echo: 3785 The number of packets that must be missed in a row in order to declare a session down Diag Code State Flags Detect Mult Length The intervals at which the local system would like to transmit control packets My Discriminator Your Discriminator Desired Min TX Interval Required Required Min Min RX Interval Echo RX Interval Auth Type Auth Length Auth Data Range: 0-31 Code: 0: AdminDown Range: 0-31 Code: 0: No Diagnostic 1: Control Detection Time Expired 2: Echo Function Failed 1: Down 2: Init 3: Up Bit: P: Poll F: Final C: Control Plane Independent 3: Neighbor Signaled Session Down A: Authentication Present 4: Forwarding Plane Reset D: Demand 5: Path Down (Final bit reserved) 6: Concatenated Path Down 7: Administratively Down 8: Reverse Concatenated Path Down 9-31: Reserved for Future Use Random number generated by the local system to identify a session Random number generated by remote system to identify a session The minimum interval between control packets that the local system is capable of supporting The minimum interval between Echo packtes that the local system is capable of supporting