From: Alex De Gruiter \(AU\) (Alex.deGruiter@didata.com.au)
Date: Fri Aug 11 2006 - 03:32:02 ART
VTP pruning is more dynamic than allowing or denying specific VLANs over
a trunk.
If you've enabled pruning for VTP globally (which I assume from your
comments you have) and the target switch has no ports active in that
VLAN, the result is that the VLAN is implicitly removed from the trunk.
If you have no ports active in vlan 8 on the target switch, "switchport
trunk allowed vlan remove 8" won't actually have any effect - the VTP
will essentially override it. If you have no ports active on the target
switch, and you really want to use "switchport trunk allowed ...", the
only option is to disable VTP; however I don't know which workbook you
have so I can't validate whether that would be acceptable.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Tim Chan
Sent: Friday, 11 August 2006 4:22 PM
To: ccielab@groupstudy.com
Subject: trunk allowed vs pruning
Hi all,
I keep confusing myself and need some clarification.
What's the relationship between "vtp pruning" and "switchport trunk
allowed"?
In one of the workbook labs, one of the tasks states:
1. although it does not have it locally assigned ensure that SW1
receives traffic for vlan 8 over Fast0/13
2. traffic for vlan 8 should not be received over any of the other trunk
links.
(The two switches are trunked together on Fast0/13-15 using dot1q.)
So my thinking is to do "switchport trunk allowed vlan 8" on fast0/13
and to not allow it on 14 & 15.
But the solution says the answer is "switchport trunk pruning vlan
2-7,9-1001".
How does this solution solve either of the two tasks?
Please advise,
-tim
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