Re: MSTP & PVST+ interoperation

Oops, spoke too soon. On a second thought, the only way both can be
merged is that that the MST side can present common roots to the PVST
side, and that requires the root on the MST side for all MST instances.

Never thought of that before... :( Sorry.

Carlos G Mendioroz @ 26/09/2012 06:46 -0300 dixit:
> 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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>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net