[c-nsp] VSS and 3560, convergence measurement

[Mikhail]

Hello, list.

We have VSS 1440 and we try to measure convergence time when we pull one of
the copper links from 3560 (Etherchannel, PAgP, desirable-desirable, we also
tried on-on).

We do it by sending "ping -f -i 0.1 -W 0.1 <IP>" from the Linux station:

Linux -- [3560] === [VSS] === [4948] --- <IP>

This command prints us about 12-18 dots which is 1200-1800ms (btw, when we
pull one of the 10Gb links from 4948 it prints usually 1-2 dots, sometimes 3
dots).

VSS design guide states that for 3xxx series port failure convergence time
should be about 200ms.

1. Does "ping" measurement actually give us convergence time? Is there any
"official" method for such type of measurement?

2. I suspect that 3560 is the root of the issue. Is it normal for that
switch to converge for 1,5 second after losing one of the Etherchannel
links?

Thank you in any advance!