How is the value of SRTT derived for the "sh ip eigrp nei" command?
The SRTT is the time in milliseconds for a packet to be sent to a neigboring router and for the acknowledgement of that packet to come back to the local router.
It's computed using the round trip time (RTT) of the last acknowledge packet and the previous "smoothed round trip time).
srtt = (srtt * .8) + (rtt * .2)
So a single "out of whack" RTT doesn't really mess up the other timers reliant on it, which are the round trip timeout (RTO) and the multicast flow timer.
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