Windows DHCP issues with PC connected to Cisco IP Phone
I have seen a lot of posts on this topic but can't seem to find one with an actual resolution. We just upgraded to the last SCCP firmware (8.1.2) for 7940G and 7960G IP phones on a 6.1.2 Cluster. We are having sparodic issues with the PCs getting an IP address from the DHCP server following the upgrade. The IP Phone gets a DHCP address from the same DHCP server without an issue. If I unplug the PC from the IP Phone and go directly to the switch I get an IP address. I can then unplug the PC and reconnect everything back via the IP phone and all still works. I can even then release and renew from the PC without an issue.
Check DHCP server and scopes. Plenty of available address and when I connect the PC directly I instantly get an IP address.
Re: Windows DHCP issues with PC connected to Cisco IP Phone
What we have done so far is isolate the issue related to the IOS version on the switch. The switch is a 3560G running 12.2(50)SE. We just upgraded one of our switches to 12.2(50)SE3 and the problem seems to have gone away. Also, we do not have this issue on a Catalyst 6509 (Cat OS 8.1.3) or 3550 (12.2(50)SE3).
I have contacted TAC to confirm this is the issue.
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