From: Joseph Rinehart (jjrinehart@hotmail.com)
Date: Wed Jun 18 2003 - 15:08:26 GMT-3
That is the ticket, you can also list the allowed VLANs in a range and omit
the one you do not want
----- Original Message -----
From: "Joe Deleonardo" <jdeleonardo@cox.net>
To: <ccielab@groupstudy.com>; <cciesecurity@yahoogroups.com>;
<security@groupstudy.com>
Sent: Wednesday, June 18, 2003 11:00 AM
Subject: STP down a trunk
> Hi,
>
> I'm working on a problem.... besides these groups have been too quite.
;-)
>
> It's a lab in a Cisco book. One of the steps is, "do not propagate VLAN26
and
> VLAN13 down the trunk."
>
> At first I thought about pruning, but there's only one CAT 3550 switch in
the
> design. Then I thought about using, "switchport trunk allowed vlan remove
26"
> etc. Then I checked the final config per Cisco and neither idea I had for
> taking care of that step showed up in the final config.
>
> There's nothing in the final solution that's foreign to me or that I think
> will solve this step. It's a very basic switch config.
>
> Here's the trunk config:
>
> int f0/5
> switchport mode trunk
> switchport trunk encap dot1q
>
> Here is the config for one of the vlans:
>
> int f0/6
> switchport mode access
> switchport access vlan 26
>
> An excerpt from the vlan database:
> vtp server
> vtp domain lab
> vtp password cisco
> vlan 26 name VLAN26
>
> Now I know what you're thinking. If there is only one cat 3550 switch,
then
> why the password. Maybe it's for planning for a future addition or just
> plain security? But in this map and problem there is only one CAT 3550.
>
> I suppose it could just be an oversight on the side of the author, by not
> including the solution. But I've gone back and re-read everything about
the
> encapsulation, trunking and vlans I could find and I can't find anything.
> This kind of stuff will sit in the back of my head until I know what's
going
> on... any ideas? I'm just afraid I'm missing something key.
>
> Thanks,
>
> Joe
>
>
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