IE Lab 4 - section 1.7 - pruning vlan 8

From: Pankaj
Date: Wed Aug 04 2004 - 12:35:50 GMT-3


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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