Cisco SGE2000 Reference Guide - Page 181
Interface Priority, Path Cost, Designated Bridge ID, Forward Transitions, Remaining Hops
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Chapter SGE2000/SGE2000P Gigabit Ethernet Switch Reference Guide 10 - 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. Chapter 10: Configuring Spanning Tree 173 Defining Multiple Spanning Tree
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