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

[Ryan Huff]

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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