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Problems configuring multi-chassis LAG with STP to core router
I am trying to configure two M7100-24X in a configuration that looks exactly like this http://i.imgur.com/huVN2h9.png, ready to take to our datacenter and migrate our existing hosts onto it. The datacenter provide us only with two links, a gateway address and tell us to use STP (they can't/won't aggregate these links at their end). My test platform for their equipment is two links terminating at a bridged interface on a pfsense box with STP configured. The issue is that flows arriving at the switch with the backup link (i.e. the one blocked by STP) seemingly won't cross the bridge to get to the gateway (or the other switch, if attempting to access the management interface, meaning one of the switches is inaccessible from the router side). Flows between interfaces assigned to a VPC are rerouted and work as they should under all faliure modes, so it's seemingly just flows that need to cross the bridge that don't terminate at an MLAG interface that are affected. STP is enabled on all ports and LAG interfaces, router has highest STP priority, one switch has higher priority than the other and the correct ports are designated as the next hops. Non-MLAG terminated flows just won't cross the bridge. Can someone shed some light on: a) If this is actually possible on this hardware? b) If it is, what is the suggested configuration? Thanks.