Alcatel OS-LS-6224 User Manual page 225

• Disabled — Indicates that STP is disabled on the port.
• Port State — Indicates whether the port is enabled for the specific instance. The
possible field values are:
• Enabled — Enables the port for the specific instance.
• Disabled — Disables the port for the specific instance.
• Type — Indicates whether the port is a Boundary or Master port. The possible field
values are:
• Boundary Port — Indicates that the port is a Boundary port. A Boundary port
attaches MST bridges to LANs in an outlying region. If the port is a Boundary
port, this field also indicates whether the device on the other side of the link is
working in RSTP or STP mode
• Master Port — Indicates the port is a master port. A Master port provides
connectivity from a MSTP region to the outlying CIST root.
• Role — Indicates the port role assigned by the STP algorithm to provide to STP
paths. The possible field values are:
• Root — Provides the lowest cost path to forward packets to the root device.
• Designated — Indicates the port or LAG through 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 or when a LAN has two or more connections
connected to a shared segment.
• Disabled — Indicates the port is not participating in the Spanning Tree.
• Mode — Indicates the STP mode by which STP is enabled on the device. The
possible field values are:
• Classic STP — Classic STP is enabled on the device. This is the default value.
• Rapid STP — Rapid STP is enabled on the device.
• Multiple STP — Multiple STP is enabled on the device.
• Interface Priority — Defines the interface priority for the specified instance. The
default value is 128.
• Path Cost — Indicates the port contribution to the Spanning Tree instance. The
range should always be 1-200,000,000.
• Designated Bridge ID — Displays the ID of the bridge that connects the link or
shared LAN to the root.
• Designated Port ID — Displays the ID of the port 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 page.
• Forward Transitions — Indicates the number of times the LAG State has
changed from a Forwarding state to a Blocking state.
• Remain Hops — Indicates the hops remaining to the next destination.
Configuring Spanning Tree
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