To connect Cisco ACI fabric using Layer 2 with external third-party switches configured using 802.1s protocol, the two constructs required are:
Spanning tree policy for mapping MST Instances to VLANs (Option A): This policy will ensure that the Multiple Spanning Tree (MST) instances on the third-party switches are correctly mapped to the VLANs in the ACI fabric.
Static binding of native VLAN in all existing EPGs (Option E): This construct is necessary to maintain the native VLAN across all EPGs when integrating with third-party switches that use 802.1s protocol.
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