Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 168
the remote Desired TX Interval and the local Required Min RX Interval., Transmit interval
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www.dell.com | support.dell.com Table 11-1. BFD Packet Fields Field Diagnostic Code State Flag Detection Multiplier Length My Discriminator Your Discriminator Desired Min TX Interval Required Min RX Interval Required Min Echo RX Authentication Type Authentication Length Authentication Data Description The reason that the last session failed. The current local session state. Refer to BFD sessions. 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 Demand mode (refer to BFD sessions). Note: FTOS does not currently support multi-point sessions, Demand mode, authentication, or control plane independence; these bits are always clear. The number of packets that must be missed in order to declare a session down. The entire length of the BFD packet. A random number generated by the local system to identify the session. A random number generated by the remote system to identify the session. Discriminator values are necessary to identify the session to which a control packet belongs since there can be many sessions running on a single interface. The minimum rate at which the local system would like to send control packets to the remote system. The minimum rate at which the local system would like to receive control packets from the remote system. The minimum rate at which the local system would like to receive echo packets. Note: FTOS does not currently support the echo function. An optional method for authenticating control packets. Note: FTOS does not currently support the BFD authentication function. Two important parameters are calculated using the values contained in the control packet. • Transmit interval - Transmit interval is the agreed-upon rate at which a system sends control packets. Each system has its own transmit interval, which is the greater of the last received remote Desired TX Interval and the local Required Min RX Interval. • Detection time - Detection time is the amount of time that a system does not receive a control packet, after which the system determines that the session has failed. Each system has its own detection time. • In Asynchronous mode: Detection time is the remote Detection Multiplier multiplied by greater of the remote Desired TX Interval and the local Required Min RX Interval. • In Demand mode: Detection time is the local Detection Multiplier multiplied by the greater of the local Desired Min TX and the remote Required Min RX Interval. 168 | Bidirectional Forwarding Detection
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