[c-nsp] Splitting VTP domain without a meltdown

[Murphy, William]

DTP which negotiates your trunks will only negotiate the trunk between
switches in the same VTP domain.  The only way around this that I know
of is to hard code your trunks using the following:

switchport mode trunk
switchport nonegotiate

Once you do this the switch no longer cares if the other end is in the
same VTP domain...


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jeff Kell
Sent: Friday, October 05, 2007 12:05 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Splitting VTP domain without a meltdown

I'm trying to split a branch building off of the main campus VTP domain
and not having much success.

Currently we have one VTP domain that propagates over the main campus.
The goal is to split this into several independent domains to reduce the
vlan count and move to L3 distribution, and make the L3 uplink point a
VTP server for the new domain.

In a testbed case, I could remove a switch from the domain.  The vlan
configuration remained "frozen" and things kept working OK.

In the production case, when I change the VTP domain, the trunks drop
back to vlan1 only and things go to hell :-)

Is there a "non-invasive" way to break a building off of a VTP domain
without visiting each wiring closet and manually configuring things for
the new domain?  Surely there is a "non-forklift" approach to accomplish
this task.

Thanks in advance,

Jeff
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