[cisco-voip] WAN Delays > 80ms for CUCM cluster?

[Matt Jacobson]

You could use the CLI packet capture with some filters to maximize the
capture window, run the dbreplication command once or twice, and then stop
the capture. Pop open RTMT, download the capture(s), and then see what you
find in Wireshark.

On Tue, Nov 6, 2018 at 20:58 Nick Barnett <nicksbarnett at gmail.com> wrote:

> We all know the max latency is 80ms, but ours occasionally goes over. I'm
> trying to track down why but the network team cannot find an issue. We are
> able to reproduce the issue repeatedly by running "utils dbreplication
> runtimestate." Whether this is causing the issue (I doubt it) or that
> command just takes long enough to run that it will eventually find a time
> that is > 80ms (my guess Is yes)... I'm not 100% sure.
>
> We opened a case with TAC to find out what that command is actually doing,
> but they won't divulge the info that our network team needs.
>
> My theory is that it's actually calling some shell script in redhat under
> the CLI appliance layer. Has anyone investigated that? Do we know what this
> command is actually doing? Specifically, i want to know where it's getting
> those ping times... is it running a generic ping with generic datagram
> data? Is it sending a 1497 packet of 0x0000 and then 0xFFFF? Basically, I'm
> trying to give the network team something to go on because they are saying
> it's not them. (Of course they could run a packet capture and tell me
> (mostly) what it's doing, but it's hard to get their attention when they
> don't think it's on their end).
>
> Thanks,
> Nick
>
> P.S.  We have frequent DB replication issues... at least a few times per
> quarter. This is so annoying and I'm pretty sure it's due to this latency,
> but I can't get anyone to pay attention.
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