MST BPDU via EoMPLS Pseudowire Connections

Question

Hi All,
I've been trying to change the STP  mode of my MPLS aggrigation switches to MST due to many reasons but without success. (Currently all switches are working on PVST+.)
Below given my sample network topology, configurations on both switches and pseudowire configurations and error message.
ME3750(SW1) --- 7609 (EoMPLS pseudowire - VLAN 2500) 12406 -- ME3750(SW2)
Configurations
==========
ME3750(SW1)
=============
spanning-tree mode mst
spanning-tree extend system-id
spanning-tree mst configuration
name MPLS
revision 10
instance 10 vlan 2-99
instance 20 vlan 100-1999
instance 30 vlan 2000-4094
spanning-tree mst 0,10,20,30 priority 24576
vlan 3,100,850,2500,3030
7609-PE
=======
interface GigabitEthernet0/1.2500
description *** MST_TEST ***
encapsulation dot1Q 2500
xconnect 10.2.0.5 2500 encapsulation mpls
end
ME3750(SW2)
===========
spanning-tree mode mst
spanning-tree extend system-id
spanning-tree mst configuration
name MPLS
revision 10
instance 10 vlan 2-99
instance 20 vlan 100-1999
instance 30 vlan 2000-4094
12406-PE
=======
interface GigabitEthernet2/1/0.2500
description *** MST_TEST ***
encapsulation dot1Q 2500
xconnect 10.1.0.8 2500 encapsulation mpls
end
There is a VLAN bsed EoMPLS configuration on VLAN 2500 on MPLS edges.
When the MST configuration done; the uplink trunk port of the ME3750(SW1) blocked with following erroe.
*Mar  1 02:45:11.920: %SPANTREE-2-PVSTSIM_FAIL: Blocking designated port Gi0/1: Inconsitent superior PVST BPDU received on VLAN 2500, claiming root 24576:001a.a2b5.7d00
While I googled, i found one post saying to change the priority of the MST regions to higher, hence forcing  one switch to become ROOT. Accordingly I changed the priority of ME3750(SW1) but still problem remains.
Can anyone of you experts help me out to get this sorted?
Note: I've not enabled native VLAN on both switches towards MPLE PEs and also hasn't enable any L2 protocols via speudowire connection.
Thank you all,
Chaminda

Answer 1

Hi Laurant,
Thanks for your reply.
Actually  my requirement is to have local MST reigions per MPLS PE. That is why I  psecificaly block native VLAN passing through the PW and did not enable  any L2 protocols via PW.( believe this is a good practice.. ;-) )
BTW  I'll clear STP protocol as you suggested and see the results.
Also I can not configure port mode PW, since all my L2 & L3 customers interface with MPLS PE via this Gig interface.
My  understanding on MST BPDUs are passing through native VLAN. Hence in my  scenarion, if i'm not passing native VLAN throught the PW, what could  be the reason for blocking the entire port due to the "inconsistance  superior BPDU receive via VLAN 2500"?
Do I need to block STP on 7609 box itself? (read on one blog asking to disable STP on SUP720 on 7609)
Pl clarify.
Thank You,
Chaminda