[cisco-voip] DHCP Problems | CME / Windows

[Ryan Ratliff]

debug dhcp detail
debug ip dhcp server event
debug ip dhcp packet

I don't believe the ios dhcp server will attempt to serve requests on an interface it doesn't have a dhcp pool defined for.  Do you happen to have another router with a data vlan address and ip-helper pointed to the CME router?

-Ryan

On Mar 11, 2010, at 12:21 PM, Kim, Hyoun S wrote:

After implementing the last Cisco VoIP solution for our offices, I’ve stumbled across a problem with machines (all Windows) that occasionally drop their network connection just briefly every couple of hours.  While this normally wouldn’t be a problem, it is for us because we redirect several of the default Windows folders to a Windows server.  When the connection drops, Windows loses these folders and you have to log off/log on to get them back.
 
Looking into the Event Properties of various windows machines, it intermittently gets a DHCPNACK message from another DHCP server.  Unfortunately, that DHCP server is the DHCP pool I set up on the CME.
 
One of the Ethernet ports on the CME is configured for the data VLAN.  This is connected to our switch with only the data VLAN being shown when I perform a show spanning-tree on that interface.
The other Ethernet port is strictly configured for the voice VLAN and displays only the voice VLAN in a show spanning-tree on that interface.
 
Each PC port has both the data VLAN & voice vlan defined in the configuration w/ the phone containing “switchport voice vlan 100”.
 
Do you guys have any suggestions on why the Windows machines are trying to pull an IP from the Cisco DHCP server I set up for the phones?
 
Thanks in advance.
 
 
<image001.jpg>
Hyoun Kim • Network Administrator I – East Division
640 Broadmor Blvd • Suite 80 • Murfreesboro, TN 37129
' 615.217.6245 • ' 859.312.6941 • 7 615.217.6255 • * Hyoun.Kim at chartercom.com
 
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