I have a phone that is trying to register to CME.
On the switch that connects the CME router and the phone, I had
switchport voice vlan 30
switchport mode access
switchport access vlan 30
The router could not ping the phone (statically assigned IP and VLAN set to 30)
The moment I changed the access vlan to 1, the phone registered..
The router could also ping the phone.
I cant seem to understand why having the voice and data vlans to be the same should cause an issue..
The phone had static IP address and network config along with static voice vlan 30.
My only guess is that when the voice and data vlans are the same on a switchport, it reverts from Trunk back to access, and does not send the dot1q header to the phone.
show int fa x/x switchport
either with both voice and data vlans being same or different does not show ay difference in the dot1q mode.
Any ideas ?