Alcatel-Lucent 7210 SAS M Service Manual page 264

VPLS Features
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The 7210 SAS supports two BDPU encapsulation formats, and can dynamically switch between
the following supported formats (on a per-SAP basis):
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Page 264
improvement and transitions conform to 802.1w in 30 seconds (both modes implement
fast convergence over point-to-point links).
In the RSTP mode, the transmitted BPDUs contain the port's designated priority vector
(DPV) (conforms to 802.1D-2004). Older implementations may be confused by the DPV
in a BPDU and may fail to recognize an agreement BPDU correctly. This would result in a
slow transition to a forwarding state (30 seconds). For this reason, in the comp-dot1w
mode, these BPDUs contain the port's port priority vector (conforms to 802.1w).
IEEE 802.1D STP
Cisco PVST
7210 SAS M Services Guide