[cisco-voip] IP Phone kills a DHCP Server

Wes Sisk wsisk at cisco.com
Wed Jan 14 15:17:09 EST 2009


looks like a few folks have encountered this. at least one tracked down 
to CSCef64461.

any chance you have a packet capture from the incident for further 
information?

/wes

On Wednesday, January 14, 2009 2:25:43 PM, STEVEN CASPER 
<SCASPER at mtb.com> wrote:
>  Has anyone heard of any problems where an IP phone (7911 on 6.1.1b) 
> takes down a DHCP server by flooding it with DHCP requests? Yesterday 
> one of our DHCP servers went down  The server event log indicated that 
> the phone was continuously trying to renew it's DHCP lease. Once the 
> phone was removed from the network all was well. Just wondering (and 
> hoping)  this was an isolated incident due to a bad phone. The phone 
> firmware load is SCCP11.8-3-3SR2S
>  
> Thanks!
> Steve
>  
>  
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