We have a 3750X switch stack in one building and it is connected to another building using Ten gig portchannel to a 7K. DHCP traffic has been sniffed and confirmed that the offer packet makes it to the 3750X but it doesn't make it to the switchport where a Cisco IP phone resides. The IP phone is stuck in Configuring IP because it never receives the offer packet that the 3750 gets from the DHCP server. Desktops on the same port work fine. Been on a TAC call for 7 hours.
All the ports have the same voice vlan and data vlan. Two of the phones are 7937's and just have the voice vlan as access valn. The DHCP offers make it to the 3750X but do not get seen by the phone. We have DHCP snooping and ARP inspection turned on but for different VLANs, not voice or data vlans. But we found disabling DHCP snooping and ARP inspection globally fixed the issue. There must be some kind of bug. We are using a specific encryption module that has been the bain of our existence since we implemented it. I think we are looking into just brining in a 5K, to connect this building to the 7K across the street, so we can pull the encryption module on our 3750X switch stack.
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