Re: MSTP & PVST+ interoperation

Not sure of the solutions for this but afaik you would be breaking stp rules hence port inconsistent state!

Schedule an outage and migrate to mst.

--
BR
Tony
Sent from my iPhone on 3
On 26 Sep 2012, at 11:04, Viet-Hung TON <vton_at_integra.fr> wrote:
> Hi Carlos,
> 
> In the boundary switch between the MSTP and PVST, as this router see the 
> *ROOT* is actually not in the MSTP domain, this device push the 
> interface in an inconsistency state *BKN* althoudh they see the root 
> bridge through this port. This case is really like the scenario 3: 
> *PVST+ and MSTP interoperation* in the blog: 
> http://blog.ine.com/2008/09/24/mstp-tutorial-part-ii-outside-a-region/
> 
> But the problem we have is that we cannot change the Root bridge to the 
> domain of MSTP as mentions in the example.
> 
> That's why I search for a solution which is like the VLAN master in 
> topology-group of Brocade that permit resolving this case.
> 
> Thanks,
> 
> Viet
> 
> On 09/26/2012 11:46 AM, Carlos G Mendioroz wrote:
>> Why do you say "the MST region wants to have the Root Bridge inside" ?
>> As you say you control the MST area, this "wants" relates to which 
>> entity ? MST has internal regional root and "global" root bridges.
>> 
>> AFAIK, cisco's MST implementation knows how to merge into a PVST area.
>> And that is reflected by the "Bound(PVST)" label (region boundary, PVST).
>> 
>> Are your areas multiply connected ?
>> 
>> -Carlos
>> 
>> Viet-Hung Ton @ 25/09/2012 21:01 -0300 dixit:
>>> Hi,
>>> 
>>> I have a region of MSTP that must communicate with a zone of PVST. 
>>> Because of historical reason, I must leave the Root bridge in the 
>>> PVST+ zone, but in theory, the MSTP region want to have the Root 
>>> Bridge inside, that's why interfaces of routers in this region are in 
>>> the unfunctional state when doing a "show spanning-tree":
>>> 
>>> Root BKN* 20000 128.1 P2p Bound(PVST) *PVST
>>> 
>>> Do you have any ideas how to resolve this problem considering that I 
>>> can just change the configuration in the MSTP zone but not to PVST 
>>> zones?
>>> 
>>> Is there any things of Cisco like Topology-group with the Master Vlan 
>>> of Brocade, where we can take a Vlan in mode PVST and mapping all 
>>> others Vlans to this Vlan (only one instance of PVST)?
>>> 
>>> Thanks for your help,
>>> 
>>> Viet
>>> 
>>> 
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