Virtual Private LAN Services
7210 SAS M Services Guide Page 267
MSTP for QinQ SAPs
MSTP runs in a MVPLS context and can control SAPs from source VPLS instances. QinQ SAPs
are supported. The outer tag is considered by MSTP as part of VLAN range control
Provider MSTP
Provider MSTP is specified in (IEEE-802.1ad-2005). It uses a provider bridge group address
instead of a regular bridge group address used by STP, RSTP, MSTP BPDUs. This allows for
implicit separation of source and provider control planes.
The 802.1ad access network sends PBB PE P-MSTP BPDUs using the specified MAC address
and also works over QinQ interfaces. P-MSTP mode is used in PBBN for core resiliency and loop
avoidance.
Similar to regular MSTP, the STP mode (for example, PMSTP) is only supported in VPLS
services where the m-VPLS flag is configured.
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