108 BES50 administrationItem Descriptionis attached to this segment, the port with the smaller IDforwards packets and the other port is discarding. All portsare discarding when the switch is booted, and then some ofthem change state to learning, and then to forwarding.Forward Transitions The number of times this port has changed from the Learningstate to the Forwarding state.Designated Cost The cost for a packet to travel from this port to the root in thecurrent Spanning Tree configuration. The slower the media, thehigher the cost.Designated Bridge The bridge priority and MAC address of the device through whichthis port must communicate to reach the root of the SpanningTree.Designated Port The port priority and number of the port on the designatedbridging device through which this switch must communicate withthe root of the Spanning Tree.Oper Path Cost The operational path cost of the LAN segment attached to thisinterface. This parameter is determined by manual configurationor by autodetection, as described for Admin Path Cost in"Configuring STA settings for interfaces" (page 67).Oper Link Type The operational point-to-point status of the LAN segment attachedto this interface. This parameter is determined by manualconfiguration or by autodetection, as described for Admin LinkType in "Configuring STA settings for interfaces" (page 67).Oper Edge Port This parameter is initialized to the setting for Admin Edge Portin "Configuring STA settings for interfaces" (page 67) (true orfalse), but it is set to false if a Bridge Protocol Data Unit (BPDU) isreceived, indicating that another bridge is attached to this port.Port Role Roles are assigned as follows:• The port is part of the active topology connecting the bridgeto the root bridge (root port).• The port is connecting a LAN through the bridge to the rootbridge (designated port).• The port is the MSTI regional root (master port).• The port is an alternate or backup port that may provideconnectivity if other bridges, bridge ports, or LANs fail or areremoved.The role is set to disabled (disabled port) if a port has no rolewithin the spanning tree.Trunk Indicates if a port is a member of a trunk.SMBUsing the Nortel Business Ethernet Switch 50 SeriesNN47924-301 01.01 Standard1.00 October 2006Copyright © 2006, Nortel Networks Nortel Networks Confidential.
