[c-nsp] Weird Issue with 3750-PoE Switches...

[Jeff Fitzwater]

Take a look at this doc, some version of CISCO had POE PINOUT incorrect.

http://pinouts.ru/Net/poe_pinout.shtml

Jeff Fitzwater
OIT Network Systems
Princeton University


On May 15, 2008, at 2:34 PM, Jeff Cartier wrote:

> No Phones are connected to the switchports which are having the  
> issues.  It is a straight connection to the PC.
>
> From: Fredrik Jacobsson [mailto:fred at jacobsson.nu]
> Sent: Thursday, May 15, 2008 2:37 PM
> To: Jeff Cartier
> Cc: Jeff Fitzwater; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Weird Issue with 3750-PoE Switches...
>
> Are phones connected to the switch, and PC to the phone?
> (=trunk port?)
>
> Do a "spanning-tree portfast trunk" on the interface.
> Regular config doesnt come into action on trunks.
>
> /Fredrik
> 2008/5/15 Jeff Cartier <jcartier at acs.on.ca>:
> Ports are already configured for port-fast.  Like I said, it seems  
> that
> after disabling PoE on the port everything works fine.
>
> -----Original Message-----
> From: Jeff Fitzwater [mailto:jfitz at Princeton.EDU]
> Sent: Thursday, May 15, 2008 2:29 PM
> To: Jeff Cartier
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Weird Issue with 3750-PoE Switches...
>
> If you have Spanning tree enabled on the CISCO (which is default )
> then you need to add "spanning-tree portfast " to all access ports.
> This will speed up initial boot of machine instead of going through
> the LISTENING LEARNING FORWARDING states.
>
>
> Well this sounds like your problem.
>
>
> Jeff Fitzwater
> OIT Network Systems
> Princeton University
> On May 15, 2008, at 2:13 PM, Jeff Cartier wrote:
>
> > We recently swapped out some non-PoE Cisco switches with Cisco 3750
> > 48port PoE switches and have noticed the following issue.
> >
> >
> >
> > When users reboot their PC they have troubles establishing their
> > folder
> > connections in Windows...the following error is seen in the event  
> log.
> >
> >
> >
> > Windows cannot obtain the domain controller name for your network.
> > Group policy processing aborted.  Event ID 1054
> >
> >
> >
> > It seems that when users log onto the computers after a warm/cold
> > start
> > the network connection doesn't establish right away.  We've found  
> that
> > disabling PoE on the access-port solves the issue.
> >
> >
> >
> > Has anyone experienced anything similar?
> >
> >
> >
> >
> >
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