VLAN configuration question

[30362]

I am currently setting up a 3750-EMI switch to connect to 3 different stacks on 3550-SMI switches. I would like to configure each stack (specific to a floor) for a different vlan when connecting to the 3750.

I have created the 3750 as the VTP Server and have created my 3 VLANs in the VLAN database as 101, 102 and 103 (floors 1 through 3). I have also set the 3550s in each stack in VTP client mode and the VTP domain is consistent across the switches.

On my 3750 I setup one port as a trunk to a gigabit port on the 3550:

interface GigabitEthernet1/0/4
description Trunk to Floor 3 Switch Stack port Gi0/2
switchport access vlan 103
switchport trunk encapsulation dot1q
switchport mode trunk

On my 3550 I have setup the Gigabit port as a trunk as well:

interface GigabitEthernet0/2
description Trunk to Core 3750 port Gi1/0/4
switchport access vlan 103
switchport trunk encapsulation dot1q
switchport mode trunk

Although I both appear to be setup, I am having trouble understanding why when I setup the port as part of vlan 103 I still show all ports in vlan1 when I do the SHOW VLAN command and no ports in vlan 103.

I want to leave VLAN1 as an administrative VLAN, but all other ports should be on VLAN 103 (on this switch stack).

Am I missing something obvious?

Thanks in advance.

 

[lmcdd]

After you use the switchport access vlan 103 command, they still show up as vlan103?

 

[pmesjar]

You can't have one port both set up as access and trunk. You can use either "switchport mode access" or "switchport mode trunk". And when you set up a port as "switchport mode trunk", it should disappear from output of "show vlan" command. Trunk ports can be verified using "show interfaces trunk" command.

Peter Mesjar
CCNP, A+ certified
pmesjar@centrum.sk

"The only true wisdom is in knowing you know nothing.

 

[baddos]

A trunk needs to be in the native VLAN (normally VLAN1). What you are seeing is deisgned that way.

Remember that a trunk is normally used to connect other switches together and pass more than one VLAN. Hence so, you shouldn't be able to nail it to a specific VLAN because then it wouldn't be a trunk.