VTP question

VTP transparent mode causes a switch to pass VTP messages, but not b affected by them. You still can create, delete and modify VLANs in thi mode, but the information configured on the switch will not propagat via VTP. VTP mode and domain information is saved in NVRAM. Transparen mode is the only mode you can use to create extended-range VLANs. The have SW1 and SW3 use different VTP databases, you will need to hav different vtp domains on each switch

-- faris

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My understanding with VTP Transparent is that it will forward VTP VLAN database information just fine, it just ignores updates for its own database. That means that SW1 and SW3 will update each others VLAN databases when either makes a changes since the domain's are the same name (assuming you don't have any auth that is different for the two).

I would think to filter VTP you need to have some sort of true layer 3 devices between your layer 2 devices to really stop VTP completely or you run a separate VTP domain for each switch.

- Ed

Check if the switch in question supports VTP off mode

set vtp mode off

Option for No VTP - Enables a switch to not only be a non-participant in VTP, but also to drop all VTP traffic (unlike Transparent mode which passes VTP traffic) thus creating a VTP boundary.