RE: IE Lab 4 - section 1.7 - pruning vlan 8

From: Larry Metzger (larrymetzger@sbcglobal.net)
Date: Wed Aug 04 2004 - 12:39:37 GMT-3


You need to think about which device is doing the pruning. The device
that does not need the data will request to be pruned from the other
device. That's why you put the command on sw2.

Larry

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Pankaj Bhagwanani
Sent: Wednesday, August 04, 2004 8:36 AM
To: ccielab@groupstudy.com
Subject: IE Lab 4 - section 1.7 - pruning vlan 8

Hello
 
Wondering if anyone can help.
 
Topology is
 
Sw1 ------ Sw2

Vtp pruing is enabled globally on each switch.
 
Vlan 8 is locally assigned on Sw2 , Vlan 8 is not locally defined via
access port or locally on sw1
 
Question asks for vlan 8 not to be pruned to sw1 , hence sw1 will
recieve all vlan 8 traffic
 
Answer in solution guide is
 
on Sw1
 
int fas 0/13
sw trunk encap dot1q
sw trunk prun vlan 2-7, 9-1001
sw mo trunk

On sw 2

int fas 0/13
sw trunk encap dot1q
sw mo trunk

Im confused with this answer, i would have though the pruning exemtion
would be configured on sw2, not sw1

This is my logic :

From my understanding, in order for sw1 to receive traffic for vlan 8 ,
we need to prevent this from being pruned at sw2 to sw1

If Sw2 does not prune the vlan ( ie through the command switchport trunk
pruning ' ) command, Sw1 will receive traffic for this vlan

As a result, Since Sw1 does not have a vlan assigned locally or via an
access-port , it will not receive traffic from fas 0/14 - 15 , but will
receive it from fas 0/13. , due to pruning enabled globally on Sw2

can someone help/clarify.

Thanks
Pankaj

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