[cisco-voip] Preservation Mode, long time for call setups...

[Jonathan Charles]

I remembered another UCS set to IP Hash and having all kinds of
connectivity issues... this is a standard switch, not a distributed and
just the basic license.

On Wed, Nov 27, 2019 at 6:11 PM Ryan Huff <ryanhuff at outlook.com> wrote:

> Route based on IP hash should be fine for 802.3ad, but technically, VMWare
> only supports it with a distributed vSwitch (would need an EA or Enterprise
> license for the hypervisor, not the “free” license) and not a standard
> vSwitch.
> I’ve seen it work with a standard vSwitch, for long periods of time even,
> and then the CAM table on a switch gets rebuilt (switch reload, power loss
> ...etc), then all hell breaks loose and you can’t get teaming to work again.
>
> If those c220s are business editions and/or have the “free” license (non
> enterprise), then that’s likely a problem. You’d likely see evidence of
> this in the switch syslog (Mac flaps, possibly err-disable... etc).
>
> What is the reason for suspecting you need to change the NIC teaming to
> active/passive?
>
> Phones going into SRST mode (may be displayed as preservation mode on
> phones) is an indication the phone’s IP lost network connectivity to all
> the call control servers listed in the phone’s configuration (xml) file.
>
> The delayed call setup could be due to the call traversing an
> unexpected/unoptimized network path, due to disruption in it’s connection
> to its preferred call control server.
>
> Thanks,
>
> Ryan
>
> > On Nov 27, 2019, at 18:17, Jonathan Charles <jonvoip at gmail.com> wrote:
> >
> > 
> > Customer has a two C220-M4S's with CUCM 11.5... both C-series are
> connected to the same 4-stack 3850 (port channel, mode on)
> >
> > Customer is reporting Preservation Mode kicking in on the LAN and some
> calls taking a long time to setup.
> >
> > Currently, VMware is set to Route based on IP Hash with PAgP channel
> groups.
> >
> > I think we need to change it to  Route Based on Originating Virtual Port
> instead, but I cannot prove it before hand...
> >
> > What could be causing the Preservation Mode on the LAN?
> >
> >
> > Jonathan
> >
> >
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> >
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