Hello!
Just for fun I decided to look at 802.1Q frames between two trunk ports that connect two 3524. What I did is connect the trunk ports via a hub and use Ethereal to watch the traffic.
What I was expecting to see were 0x8100 tagged frames, but just saw standard Etherent tags. Setting the trunk encapsulation to ISL works as expected. This is the configuration for the trunk interface
interface FastEthernet0/24 switchport trunk encapsulation dot1q switchport trunk allowed vlan 1,98,99,1002-1005 switchport mode trunk
My undertanding of non tagged frames was that only the Native VLAN frames are untagged on the trunk.
What am I missing?
TNX
/CM