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issues between cisco phones and zero client

All,

At  my organisation we have deployed over 800 zero client desktop devices  Dell Wyse P20's and they are hanging out of the phone for network  access.

The  problem we are having is that the zero client is dropping from the  network and we cannot figure out why - our estate is a pure Cisco estate  and I'll describe the topology below:

Nexus 7010 core

        ↓

Cisco 3750 dist

        ↓

Cisco 3560g or x

        ↓

Cisco 7940 or 7960 with phone FW P0030801SR02

        ↓

Wyse P20 zero desktop

The Wyse p20's go back to a Cisco UCS platform where our vmware estate is running.

Now  the drop off themselves are sporadic and drop out quite randomly. The  zero client never ever drops when they are directly patched to a switch.

Has anyone ever put a dumb hub inbetween the phone and PC to capture the traffic?

Any help would be appreciated in this matter.

Thanks,

Tam.

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