[c-nsp] BFD on ME3600/ME3800/7600s

[Adam Vitkovsky]

> James Bensley
> Sent: Thursday, May 26, 2016 4:37 PM
>
> Running BFD in no echo mode (which is what I usually do) we see the
> average interval is a lovely 47ms (but I've never had 100% clarification of
> why):
> Rx Count: 3314443, Rx Interval (ms) min/max/avg: 1/72/47 last: 36 ms ago Tx
> Count: 3310865, Tx Interval (ms) min/max/avg: 1/72/47 last: 40 ms ago
>
>
Isn’t it because in no echo mode it does just half of the work it has to in echo mode?

In no echo each participant has to just fire hellos at a given rate and reset hold-down timer upon receiving neighbour's hello.

In echo mode each participant has to fire hellos at a given rate and reset timers upon receiving its own  hello.
And in addition to that it has to receive loop back and transmit neighbour's hellos at the rate the neighbour is sending them.

And according to your little test it looks like the looping back is lot more process intensive then just resetting holdup timer.



adam


        Adam Vitkovsky
        IP Engineer

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