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FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

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Figure 419 BFD in IPv4 Packet Format<br />

IP Packet Padding FCS<br />

Destination MAC Source MAC E<strong>the</strong>rnet Type<br />

(0x888e)<br />

Preamble Start Frame<br />

Delimiter<br />

UDP Packet<br />

Protocol Header<br />

Src IP Addr Dest IP Addr Options Padding<br />

Checksum<br />

TTL<br />

(255)<br />

IHL TOS Total Length Flags Frag Offset<br />

Version<br />

(4)<br />

Source Port Destination Port Length Checksum<br />

BFD Control Packet<br />

Range: 3784<br />

Echo: 3785<br />

Range: 3784<br />

The minimum interval between<br />

control packets that <strong>the</strong> local<br />

system is capable of supporting<br />

The minimum interval between<br />

Echo packtes that <strong>the</strong> local system<br />

is is capable of supporting<br />

Random number generated by<br />

<strong>the</strong> local system to identify<br />

a session<br />

Random number generated by<br />

remote system to identify a<br />

session<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 599<br />

The The intervals intervals at at which which <strong>the</strong> <strong>the</strong> local local<br />

system system would would like like to to transmit transmit<br />

control control packets packets<br />

The number of packets that<br />

must be missed in a row in<br />

order to declare a session down<br />

Auth Type Auth Length Auth Data<br />

Required Min<br />

Echo RX Interval<br />

Required<br />

Min RX Interval<br />

Desired<br />

Min TX Interval<br />

Your<br />

Discriminator<br />

Diag Code State Flags<br />

Detect Mult Length My<br />

Discriminator<br />

Version<br />

(1)<br />

fnC0035mp<br />

Range: 0-31<br />

Code: 0: AdminDown<br />

Range: 0-31<br />

1: Down<br />

Code: 0: No Diagnostic<br />

Bit: P: Poll<br />

2: Init<br />

1: Control Detection Time Expired<br />

F: Final<br />

3: Up<br />

2: Echo Function Failed<br />

C: Control Plane Independent<br />

3: Neighbor Signaled Session Down<br />

A: Au<strong>the</strong>ntication Present<br />

4: Forwarding Plane Reset<br />

D: Demand<br />

5: Path Down<br />

(Final bit reserved)<br />

6: Concatenated Path Down<br />

7: Administratively Down<br />

8: Reverse Concatenated Path Down<br />

9-31: Reserved <strong>for</strong> Future Use

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