I am actually working in a TELCO planning the MetroEthernet and it is already deployed. We have a problem at the begining because there was two kinds of MST developed. MST Pre-Standard and MST Standard. The "big" Switches supported MST Std but the CPEs dont and that was the reason that lead us to deploy MST std in the backbone and RSTP in the CPEs rings. At this time CPEs like ME-3400 supoort MST Std so we are planning the migration to MST Std in the CPEs rings. For that, we are going to have one MST Region in the Core and 1 region per ring. Well thats my expierence, hope someone get help. Asks are welcome. John.
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