Dell PowerConnect 5548 User Guide - Page 457
Designated Bridge ID
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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. - Role - Displays the port role assigned by the STP algorithm in order to provide to STP paths. The possible options are: • Root - This port provides the lowest cost path to forward packets to root switch. • Designated - This port is the interface through which the bridge is connected to the LAN, which provides the lowest cost path from the LAN to the Root Bridge. • Alternate - This port provides an alternate LAG to the root switch from the root interface. • Backup - This port provides a backup path to the designated port. 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 - This port is not participating in the Spanning Tree. - Interface Priority - Enter the interface priority for specified instance. - Path Cost (1-200,000,000) - Enter the port contribution to the Spanning Tree instance. If a loop occurs, the spanning tree considers path cost when selecting an interface to put in the Forwarding state. - Default Path Cost - Check to use the default path cost. - Designated Bridge ID - Displays the bridge ID number that connects the link or shared LAN to the root. - Designated Port ID - Displays the Port ID number on the designated bridge that connects the link or the shared LAN to the root. - Designated Cost - Displays the cost of the path from the link or the shared LAN to the root. - Forward Transitions - Displays the number of times the port changed to the forwarding state. - Remain Hops - Displays the number of hops remaining to the next destination. Dell PowerConnect 55xx Systems User Guide 457