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Cisco IP Phones randomly reseting, and network hiccups

Posted on 2008-06-10
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Last Modified: 2012-06-21
Our environment consistts of mostly 3560 and 2950 switches.  The 3560's went in with a new Cisco IP phone system last summer.

yesterday I noticed some phone starting to reset, like you unplugged the power and plugged them back in.  More starting doing this and then I foinf a Giga port in my MF that shut off, then another and another...only on the 2950 switches.

Everything was fine overnight, and it started again today.  Phones resetting and ports shutting off.  The ports shut off do to a loopback detection.  I dsiabled the shutdown of the port to keep the network up, but the phones keep resettin randomly and I have little hiccups in the network, just long enough for Outlook to complain.

I am at a loss, any suggestions?
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Question by:DaveIsHere08
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by:Press2Esc
ID: 21754426
Does the ethenet connection at the switch blink (lit) when the IP Phone reset?  If you are using POE on the IP Phones, check the line length for excess distance which results in drops in line voltage.  

Q: All phones or 1 phone experiencing the problem?

P2E
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by:DaveIsHere08
ID: 21755822
Most phones are POE if they ar in the 3560, phones that are connected to a 2950 have an AC adapter.  It doesn't matter they are both doing it.  Sometime on here or there and other times a bunch.  They are spread out throughout the site so they are not talking to the same switch.

The 2950 uplinks were erroring out, I forced them to stay up by issuing the command to not shut down on a loopback error.  Nothing has changed on the network.  

Everything seemed to calm down around 2:00.  We have a large wireless network so I am wondering if someone has bridgeed their wireless connection.
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by:Press2Esc
ID: 21761242
Appears to be an issue with the router that the 2 switches are connected or the physical wiring. Wireless should not be an issue as it does not relate to the wired ethernet devices.  

So the problem is intermittent?  And you are not able to isolate it to specific phone(s)?

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DaveIsHere08 earned 0 total points
ID: 21764506
We figured out the issue.  The Spannnig Tree on this subnet got hosed up.  No priority was set and the root was getting moved all over the place.  Nailed it down and it seems to have resolved the issue.  I will know for sure tomorrow
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by:Press2Esc
ID: 21770657
assume.  congrats Dave.
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by:DaveIsHere08
ID: 21874714
That took care of the issue,  Have not had a problem since.  Can I give my self the points for the question?  :)
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by:Press2Esc
ID: 21875248
Thats up to you, D...  Your the keeper of the keys.
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