VTP - question about daisy chained VLAN switches

Could some one please clarify a VTP question for me.

If you have 2 or more switches daisy chained and you have VTP pruning enabled, how will a down stream switch get its VLAN info if its immediate upstream switch does not have any of the same VLANs.

Firewall.cx material says

VTP Pruning as you might have already guessed solves the above problem by reducing the unnecessary flooded traffic described previously. This is done by forwarding broadcasts and unknown unicast frames on a VLAN over trunk links only if the receiving end of the trunk has ports in that VLAN.

For example (excuse the simplistic drawing)

SwitchA - VLAN 2
SwitchA - VLAN 4
|
SwitchB - VLAN 4
|
SwitchC - VLAN 2
SwitchC - VLAN 3

Because of VTP pruning would SwitchC therefore not receive VLAN info for VLAN 2?

Thanks for your help

VTP info will still be passed between the switches, the only thing that will be filtered will be traffic.. think of it like routing protocols that will keep giving each other information to effectively manage the routed protocols.



Did I just confuse that ?

When will I learn - firewall.cx has all the answers

www.firewall.cx/vlans-vtp.php

The advertised information will firstly reach the two Catalyst 2950 switches directly connected to the 3550 and will then travel to the cascaded switches below and through the trunk links. If the link between the cascaded 2950's was not a trunk link but an access link, then the 2nd set of switches would not receive and VTP updates:

Just like you were saying sahirh.

By the way its amazing how often you come across firewall.cx when googling for networking info.

Keep up the good work firewall.cx!

Global,

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