I think this one should be simple for someone, but I am stumped...
In my customer's network, the IP phones show up in the mac address table under both the data and the voice vlans. Any suggestions? It doesn't appear to be causing any problems.
Router# sho run int fa0/33
description *** end-user data/voice port ***
switchport access vlan 100
switchport mode access
switchport voice vlan 200
no logging event link-status
srr-queue bandwidth share 1 35 40 25
mls qos vlan-based
no snmp trap link-status
Router# sho mac-address-table | incl Fa0/33
100 0024.810f.5fdf DYNAMIC Fa0/33
100 0024.c4bf.2a09 DYNAMIC Fa0/33
200 0024.c4bf.2a09 DYNAMIC Fa0/33
As you can see, the phone shows up in the mac-address-table for each vlan. The other vlan 100 device is the pc plugged into the phone.