From: Ismail AlShelh (ishelh@mdsa.com)
Date: Sat Aug 12 2006 - 16:08:54 ART
?
Hi Tim,
can you please tell me , in which lab the mentioned tasks are?
Is it in IEWB ? if yes what's the lab number?
meanwhile I will bring tomorrow two more switches to test these issues, I have
now only two 3550 switches.
I will feedback you later with my test
Thanks in advance
________________________________
From: nobody@groupstudy.com on behalf of Tim Chan
Sent: Sat 8/12/2006 9:10 PM
To: Godswill Oletu; ccielab@groupstudy.com
Subject: Re: trunk allowed vs pruning
Godswill,
Forget my last post, I see your point.
So then take it a step further and do "switchport trunk allowed vlan remove 8"
from Fast0/14 and Fast0/15.
I think that would definitely guarantee that vlan 8 will not cross either of
those trunks.
(even if the proctor was to add a port onto vlan 8)
-tim
----- Original Message ----
From: Godswill Oletu <oletu@inbox.lv>
To: kwasi-ccie@comcast.net; Tim Chan <timanji@yahoo.com>;
ccielab@groupstudy.com
Sent: Saturday, August 12, 2006 7:46:23 AM
Subject: Re: trunk allowed vs pruning
Kwasi,
Except I am missing something, I do not see how VTP pruning will always
solve the second problem, to my understanding the second problem states
that:
>traffic for vlan 8 should not be received over any of the other trunk
> links
When VTP pruning is enable on a switch, the switch is simply saying, "....I
will not receive VLAN traffics through any trunk interface for any pruning
eligible VLANs that are not locally assigned".
For pruning eligible VLANs, VTP pruning dynamically turned ON or OFF the
reception of specific VLAN traffics depending on the existence of that VLAN
in the receiving switch.
The only time when VTP pruning will be sufficient for the above task is
when VLAN 8 is not locally assigned/configured on SW1.And if VLAN 8 is not
configured on SW1 today, the mention of VLAN 8 might be a prelude to its
addition in the future and one will want his/her solution to also address
that situation.
It is very important that one's understanding & application of these
technologies is not limited to how it is applied in a particular vendor's
workbook. How one interprets Words like NOT, NEVER, MAY, ALWAYS, etc goes a
long way in determining the out come of the Lab exam.
Since VTP Pruning is a dynamic process which rely on the existence of a
locally assigned VLAN, it might not be a good idea to depend on it as a
solution for a task that states that a particular VLAN should NOT be received
over a trunk port.
It is always good to nail down one's solutions, do not leave anything to
chances. More so because one do not know how the proctor will test to see if
a particular task was given the appropriate solution. e.g. One valid proctor
test for the above task might be to configured VLAN 8 on SW1; if that is the
case, then only enabling VTP pruning and not editing the VLAN Allowed list
might not be the correct solution.
HTH
Godswill Oletu
CCIE #16464
----- Original Message -----
From: kwasi-ccie@comcast.net
To: Godswill Oletu ; Tim Chan ; ccielab@groupstudy.com
Sent: Friday, August 11, 2006 1:42 PM
Subject: Re: trunk allowed vs pruning
You only need to remove vlan 8 from the prune eligible list on sw1 port
fa0/13 to solve problem 1 (switchport trunk pruning vlan remove 8).
Problem 2 is already solved by the vtp pruning that you enbaled on both
switches. You do not need to play with the vtp allowed list to solve these
2 problems. Test it out.
-------------- Original message --------------
From: Godswill Oletu <oletu@inbox.lv>
> Tim,
>
> The solution you provided will only take care of the first task, once
VLAN 8
> is removed from the prunning eligible list of interface fa0/13, the
switch
> will continue to receive traffic for VLAN 8 regardless of local
assignment
> or not.
>
> For the second task, you have to remove VLAN 8 from the VLAN allowed
list on
> interfaces fa0/14 & fa0/15.
>
> HTH
>
> Godswill Oletu
> CCIE #16464
>
>
> ----- Original Message -----
> From: "Tim Chan"
> To:
> Sent: Friday, August 11, 2006 2:21 AM
> 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
> >
&g t; >
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