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

[Jeff Cartier]

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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