Allied Telesis AT-S63 - Manual (Page 469)

AT-S63 Management Software Menus Interface User’s Guide
Section V: Spanning Tree Protocols 469
Backup - The port on a designated switch that provides a backup for
the path provided by the designated port.
Designated - The port on the designated switch for a LAN that has the
least cost path to the root switch. This port connects the LAN to the
root switch.
Master - Similar to the root port. When the port is a boundary port, the
MSTI port roles follow the CIST port roles. The MSTI port role is called
“master” when the CIST role is “root.”
P2P
Whether or not the port is functioning as a point-to-point port. The
possible settings are Yes, No, and Auto-Detect.
Version
Whether the port is operating in MSTP mode or STP-compatible mode.
Internal Port-Cost
The port cost when the port is connected to a bridge in the same
MSTP region.