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Intel® Gigabit Ethernet Switch AXXSW1GB User Guide 101
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.
— Internal Port — Indicates the port is within the same MSTP region.
• 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.
— Rapid STP — Rapid STP is enabled on the device. This is the default value.
— Multiple STP — Multiple STP is enabled on the device.
• Interface Priority — Defines the interface priority for the specified instance. The
default value is 128. Priority should defined be between 0 and 240 in steps of 16.
• Path Cost — Indicates the port contribution to the Spanning Tree instance. The range
should always be 1-200,000,000. The default value is 4.
• 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 port or LAG has been
changed from a Forwarding state to a Discarding state.
• Remain Hops — Indicates the hops remaining to the next destination.