The Desired Min TX Interval is the BFD parameter that specifies the minimum interval, in microseconds, that the local system would like to use when transmitting BFD Control packets. This value directly represents the minimum time gap the system wants to maintain before putting the next control packet on the wire. The actual transmission interval is negotiated between BFD peers and will be the greater of the local system's Desired Min TX Interval and the remote system's Required Min RX Interval.

A. Detect Mult: This is a multiplier used with the negotiated transmission interval to calculate the BFD detection timer, not the packet sending rate.

B. Required Min Echo RX Interval: This parameter is specific to the BFD Echo function and defines the minimum interval for receiving Echo packets, not sending control packets.

D. Required Min RX Interval: This is the minimum interval at which the local system is capable of receiving BFD packets, a value it advertises to its peer.

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1. IETF RFC 5880

"Bidirectional Forwarding Detection (BFD)":

Section 4.1

"State Variables": Defines bfd.DesiredMinTxInterval as "The desired minimum interval between transmission of BFD Control packets that this system would like to use..."

Section 6.8.7

"Timer Values": Explains the fields in the BFD Control packet. It states

"Desired Min TX Interval: The desired minimum transmit interval

in microseconds

that the local system wishes to use when sending BFD Control packets..."

2. Cisco IOS XE IP Routing: BFD Configuration Guide:

"BFD Timers" section: Describes the bfd interval command syntax: bfd interval milliseconds minrx milliseconds multiplier number. The first milliseconds value is explicitly defined as the "Desired minimum transmit interval." This parameter controls how often the local system sends BFD hello packets to its neighbor.