Trunking vlan on 6500-Help Please.

I have a good idea what's need to be done, but I need a little more
assurance.


Here is what I have a core 6500 with an MSFC that is trunking all the
vlans like a typical enviorment.


I have a 3550 switch that is connected to port 7/12 on the 6500. All I
want to do is trunk vlan 442 to the 3550 without causing any problems.

Here is the command that I am using set trunk 8/12 vlan 142 type

at this point I have not hit the enter button because I am afraid that
all of my
vlans will try and trunk over this.. and my orginal trunk will be
screwed up.I have a gut feeling I am going to have to use the clear
command...should I set that up first? Will I cause any problems.

Trouble

Trouble wrote:
> I have a good idea what's need to be done, but I need a little more
> assurance.
>
>
> Here is what I have a core 6500 with an MSFC that is trunking all the
> vlans like a typical enviorment.
>
>
> I have a 3550 switch that is connected to port 7/12 on the 6500. All I
> want to do is trunk vlan 442 to the 3550 without causing any problems.
>
> Here is the command that I am using set trunk 8/12 vlan 142 type
>
> at this point I have not hit the enter button because I am afraid that
> all of my
> vlans will try and trunk over this.. and my orginal trunk will be
> screwed up.I have a gut feeling I am going to have to use the clear
> command...should I set that up first? Will I cause any problems.

If you are using CatOS.

show trunk 7/12

Now you can see which vlans are trunking over the link.

set vlan 442 7/12

This will add Vlan 442 to the list of vlans being trunked on 7/12.

clear vlan 442 7/12

This will delete Vlan 442 from the trunk.

If you have ports set in vlan 442 on the other side of the trunk I
don't think
that VTP will prune it from the trunk if you have VTP pruning enabled.

D