Outlines operational restrictions and guidelines for implementing MSTP to ensure network stability and compliance with supported features.
MSTP restrictions
Apply these restrictions when deploying MSTP on Cisco 8000 Series Router interfaces and bridge domains:
-
Configure MSTP only on the main Layer 3 or Layer 2 interface.
-
Map subinterfaces to MSTI instances by the outermost VLAN tag ID, regardless of whether encapsulation uses QinQ or a single VLAN tag.
-
Treat split-horizon group alignment and MSTI grouping by VLAN ID as independent requirements.
-
Use the same MSTI for all subinterfaces in a bridge domain when MSTP runs on the main interface.
-
Do not create an untagged subinterface when MSTP runs on the main interface.
-
Ensure the bridge-domain design meet the supported interface and VLAN-mapping rules before deploying MSTP.
-
Redesign the interface and bridge-domain layout if your design requires a different encapsulation or subinterface model.