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Chapter 10: Configuring Spanning Tree
Defining Multiple Spanning Tree
SGE2000/SGE2000P Gigabit Ethernet Switch Reference Guide
Chapter
10
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Boundary Port
— Indicates the port is a boundary port. A Boundary port attaches MST
bridges to LAN in an outlying region. If the port is a boundary port, it 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
— 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
— Indicates the port is not participating in the Spanning Tree.
•
Mode
— Indicates the current Spanning Tree mode. The Spanning Tree mode is selected in the
Global STP
page. The possible field values are:
–
Classic STP
— Indicates that Classic STP is enabled on the device.
–
Rapid STP
— Indicates that Rapid STP is enabled on the device.
–
Multiple STP
— Indicates that Multiple STP is enabled on the device.
•
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 1-200,000,000.
•
Designated Bridge ID
— Indicates that the bridge ID number that connects the link or shared LAN
to the root.
•
Designated Port ID
— 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 page.
•
Forward Transitions
— Indicates the number of times the port has changed from Forwarding state
to Blocking state.
•
Remaining Hops
— Indicates the hops remaining to the next destination.
