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Bronze

VTP v2 Transparent mode forwarding

All,

As part of my recertification, i am studying VTP (again) and i ran into the following question:

I know VTP v1 switches in transparent mode only forward VTP advertisements if the domain name is the same and if the version is the same (so only v1 gets forwarded and only if the domain name matches)

I know VTP v2 has a feature called: version-independent forwarding: a VTP v2 transparent switch will forward VTP v2 packets as well as VTP v1 packets.

BUT what about the domain name ? Does it still need to match ?

Will a VTP v2 Transparent Switch in domain "Cisco" forward a VTP v1 or v2 advertisement of domain "TEST" ???

regards,

Geert

3 REPLIES
Silver

Re: VTP v2 Transparent mode forwarding

To answer your question I quote the documentation of 3550 12.2(25)SE

"Version-Dependent Transparent Mode -- In VTP version 1, a VTP transparent switch inspects VTP

messages for the domain name and version and forwards a message only if the version and domain

name match.

Because VTP version 2 supports only one domain, it forwards VTP messages in

transparent mode without inspecting the version and domain name."

HTH

Leon

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Bronze

Re: VTP v2 Transparent mode forwarding

Ok. Thx. Let us believe the documentation.

Although it is not really clear why this feature is called "version dependent transparent mode" and not "version independent transparent mode". To me it seems more logical - since it forwards v1 and v2 - to be version independent...

So in the following situation:

SW1 ---- trunk --- SW2 ----- trunk----- SW3

Server Transparent Client

VLANS 1,2,3

Domain TEST Domain Cisco Domain TEST

If SW2 is running VTP v1 --> SW3 does not know any VLANs

If SW2 is running VTP v2 --> SW3 does see VLANS 1,2,3

Geert

Silver

Re: VTP v2 Transparent mode forwarding

You're right, it is vagually worded. But it works for me.

Good luck on your composite exam. Happy learning.

Best regards,

Leon

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