03-13-2006 03:11 AM - edited 03-03-2019 02:14 AM
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
03-13-2006 03:53 AM
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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03-13-2006 05:13 AM
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
03-13-2006 05:19 AM
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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