[cisco-voip] PC Port on Phone Fails During Large Data Transfer

Carter, Bill bcarter at sentinel.com
Tue Feb 24 13:50:21 EST 2009


>From my experience, hard setting duplex on 1 side of a connection and
not the other will always result in duplex mismatch. 

For auto-negotiation, standards say the devices try to negotiate duplex,
this is done in signaling between devices. If a device's duplex setting
is hard set, it does not respond to duplex negotiations. The standard
says if a device does not participate in duplex negotiation, the device
configured for auto-duplex-negotiation should set itself to half-duplex.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of STEVEN CASPER
Sent: Tuesday, February 24, 2009 12:12 PM
To: James Buchanan; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] PC Port on Phone Fails During Large Data
Transfer

 

This is our standard at the moment

 

Switch ---------Phone Switch Port---------Phone PC Port-------   PC NIC

Auto/Full            Auto/Auto                           100/Full
100/Full  

 

There is a long convoluted history behind these settings but we have not
had any issues until recently.

 

Please consider the impact on our environment before printing this
e-mail. 



>>> "James Buchanan" <jbuchanan at ctiusa.com> 2/24/2009 12:07 PM >>>

When you hardcoded to 100/Full, did you hardcode on the switch end and
inside the phone?

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of STEVEN CASPER
Sent: Tuesday, February 24, 2009 9:49 AM
To: 'cisco-voip at puck.nether.net'
Subject: [cisco-voip] PC Port on Phone Fails During Large Data Transfer

 

 Has anyone run across the following scenario - 

 

 When large amounts of data are transferred between an IP Phone and an
attached PC such as during a Microsoft Office update the update fails.
When the failure occurs the phone shows the status of port 2 (PC Port)
as no link. it was working fine prior to the update starting. This fails
consistently when the phone PC port and the PC NIC is set for 100/full,
always seems to work when both are set to Auto/Auto or when the phone is
bypassed and the PC is plugged directly into the switch port.

 

Tried multiple phones 7941/61/11s. Current phone under test is running
phone load is 41.8-3-3SR2S and we are connected to a 3750 running
12.2.25 SEE2. Going to do more testing but wondering if any one else may
have run across this.

 

Thanks

Steve

 

 

Please consider the impact on our environment before printing this
e-mail. 

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