PLANET WGSD-1022 - Manual (Page 60)

the outlying CIST root.
• Internal, indicates the port is an internal port.
• Role
Indicates the port role assigned by the STP algorithm in order to
provide to STP paths. The possible field values are:
• Root, provides the lowest cost path to forward packets to root
device.
• Designated, indicates the port or LAG via which the designated
device is attached to the LAN.
• Alternate, provides an alternate path to the root device from the
root interface.
• Backup, provides a backup path to the designated port path
toward the Spanning Tree leaves. Backup ports occur only when
two ports are connected in a loop by a point-to-point link.
Backup ports also occur when a LAN has two or more
connections connected to a shared segment.
• Disabled, which indicates the port is not participating in the
Spanning Tree.
• Interface Priority
Defines the interface priority for specified instance.
The default value is 128.
• Path Cost
Indicates the port contribution to the Spanning Tree instance. The
range should always be 1200,000,000.
• Designated Bridge
ID
Where indicates that the bridge ID number that connects the link or
shared LAN to the root.
• Designated Port ID By which indicates that the Port ID number on the designated bridge
that connects the link or the shared LAN to the root.
• Designated Cost
Indicates that the default path cost is assigned according to the
method selected on the Spanning Tree Global Settings screen.
• Forward Transitions This indicates the number of times the port has changed from the
Forwarding state to Blocking state.
• Remaining Hops
Indicates the hops remaining to the next destination.
„ MSTP Interface status table
The page displays the current MST Interfaces configuration and status.