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sandeepontop
Beginner

Connecting USB Hub through a Cisco IP Phone 7942

I have a scenario wherein the user has connected an USB Hub ( Make : HP 3005 PR Port Replicator) to the IP Phone.

The USB Hub has

  • 2 ports of USB 2.0
  • 2 Ports of USB 3.0
  • 1 Ethernet cable to connect to the Network
  • 1 Headphone port
  • 1 Micorphone port
  • 1 Display port
  • 1 Flash Memory

Now the problem that I am facing is that the USB is connected to the PC Port of the Cisco IP Phone to get connected to the Network. Under normal circunstances the entire setup works fine. But on a daily basis, the IP Phone looses keep alives with the CUCM and goes to Configuring IP. The user needs to unplug the cable and plug it back and again works fine for a day. The phone is conected to Fast Ethernet port. Attaching the switch configuration for the user.

interface FastEthernet4/0/16

  switchport access vlan XXX

switchport mode access

switchport voice vlan XXX

authentication host-mode multi-auth

authentication order dot1x mab

authentication port-control auto

mab

mls qos trust device cisco-phone

mls qos trust dscp

dot1x pae authenticator

dot1x timeout tx-period 2

storm-control broadcast level bps 5m

storm-control multicast level bps 5m

storm-control action shutdown

storm-control action trap

     Is there something that can be configured in the switch so that the IP Phone does not loose its keep alives with CUCM. The problem occurs only when the USB Hub is connected to IP Phone. Any thoughts or suggestion for resolving the issue is greatly appreciated.

Regards,

Sandeep

1 REPLY 1
etamminga
Contributor

Please tell us what you are seeing on the switch. Do the logs complain about (re-)authentication on that port, or is/was there any storm-control going on? The switch port config shows multiple enhanced features enabled, so the cause of your phone's problems could be multiple.

Regards,
Erik

Sent from Cisco Technical Support iPad App

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