The docs say MT routers support RFC1493:
[quote]
dot1dBridge.dot1dBase.dot1dBaseBridgeAddress

dot1dBridge.dot1dStp.dot1dStpProtocolSpecification

dot1dBridge.dot1dStp.dot1dStpPriority

dot1dBridge.dot1dTp.dot1dTpFdbTable.dot1dTpFdbEntry.dot1dTpFdbAddress

dot1dBridge.dot1dTp.dot1dTpFdbTable.dot1dTpFdbEntry.dot1dTpFdbPort

dot1dBridge.dot1dTp.dot1dTpFdbTable.dot1dTpFdbEntry.dot1dTpFdbStatus[/quote]

But I can't get results from the dot1dTp branch. Any ideas?

It was available in 2.8.x but was removed for unknown reason in 2.9.x
Ask support@ ?