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QinQ in g.8032 ring with ASR901 and ME3600X

Hi Everyone, I'd like to share with you an issue that I'm facing on ASR901 platform. I'm just trying to set up a simple QinQ configuration over a g.8032 Ethernet Ring but I have troubles with MSTP and I don't understand why... Here is the configuration of my UNI port : interface GigabitEthernet0/4 negotiation auto service instance 1 ethernet encapsulation dot1q 4000 rewrite ingress tag pop 1 symmetric bridge-domain 4000 ! service instance 2 ethernet !!! This EFP is receiving client VLANs from 500 to 599 encapsulation dot1q 500-599 bridge-domain 2000 ! end Here is the NNI configuration (to other ASR901 in the ring) : interface TenGigabitEthernet0/0 no ip address service instance 1 ethernet evc1 encapsulation dot1q 1000 bridge-domain 1000 cfm mep domain domain-tpm mpid 1 ! service instance 2 ethernet encapsulation dot1q 4000 rewrite ingress tag pop 1 symmetric bridge-domain 4000 ! service instance 3 ethernet encapsulation dot1q 3001 second-dot1q 500-599 rewrite ingress tag pop 1 symmetric bridge-domain 2000 ! end When I'm configuring the last EFP on the NNI port, I have this logging entry : ASR901-1(config)#int te0/0 ASR901-1(config-if)# no service instance 3 ethernet ASR901-1(config-if)# service instance 3 ethernet ASR901-1(config-if-srv)# encapsulation dot1q 3001 second-dot1q 500-599 ASR901-1(config-if-srv)# rewrite ingress tag pop 1 symmetric ASR901-1(config-if-srv)# bridge-domain 2000 Error!!! EFP 3 maps to differenet MST instance than other EFPs in bridge-domain 2000 I don't have any other configuration concerning bridge domain 2000 and I don't have configured any STP commands. I've even deactivated all spanning-tree instances. Why should I have to deal with MSTP in this situation?? If anyone has any idea, I would appreciate... Thanks for your feedback and your help. Pierre-Louis
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