Allied Telesis AT-S63 - Manual (Page 315)

AT-S63 Management Software Menus Interface User’s Guide
Section II: Advanced Features 315
The MSTP Port State menu displays a table that contains the
following columns of information:
Port
The port number.
State
The MSTP state of the port. The possible states are:
Discarding - The port is discarding received packets and is not
submitting forwarded packets for transmission.
Learning - The port is learning the MAC address from the received
packet, but does not process or forward the packet.
Forwarding - Normal operation.
Disabled - The port has been disabled.
Role
The MSTP role of the port. The possible roles are:
Root - The port that is connected to the root switch, directly or
through other switches, with the least path cost.
Alternate - The port offers an alternate path in the direction of the
root switch.
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.