MST Access Gateway is not really running spanning tree. All it does is send pre-canned BPDU into access network at hello timer and snoop the TCN from access network, flush its local MAC address table and trigger VPLS MAC withdrawal accordingly.
You can find more details here:
ASR9000/XR Using MST-AG (MST Access Gateway), MST and VPLS
well i did not explain the situation thoroughly, and i realize this is probably not a MSTAG issue, but i give it a shot here anyway.
I have set up a complete MSTAG between two asr9k. The MSTAG is configured at one subinterface per asr9k.
The access swtiches (3560:s) does block a port according to the mst configuation of the switches witch is correct.
I create a new subinterface (vlan) at the asr:s, but the 3560s is blocking this vlan since vlan 1-4094 is configured as a part of the MST.
So, what do i do to not make the switches block this vlan.
I have tried to put the vlan in another MST instance without any luck. A have also tried to do 'no spanning-tree vlan x' at the switch, but without any luck. The 3560 is still blocking the vlan at the same port.
From my basic LAN knowledge I know MST always runs Internal Spanning Tree (IST, instance 0). It always exists on ALL ports.
We cannot disable STP on a per vlan basis in MST. Actually, MST is not running per vlan. MST is calculating the topology for several instances, completely independently of the existence of any vlan. Vlans are then mapped to the instances as to the mst configuration.
You may ask LAN switching community gurus to clarify/confirm this.
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