28. Spanning Tree
ROX™ v2.2 User Guide
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RuggedBackbone™ RX1500
• Disabled : STP is disabled on this port.
• Link Down : STP is enabled on this port but the link is down.
• Discarding : The link is not used in the STP topology but is standing by.
• Learning : The port is learning MAC addresses in order to prevent flooding when it begins
forwarding traffic.
• Forwarding : The port is forwarding traffic.
STP Role
Synopsis: string - one of the following keywords { ----, master, backup, alternate, designated,
root }
The role of this port in the spanning tree:
• Designated : The port is designated for (i.e. carries traffic towards the root for) the LAN it is
connected to.
• Root : The single port on the bridge, which provides connectivity towards the root bridge.
• Backup : The port is attached to a LAN that is serviced by another port on the bridge. It is not
used but is standing by.
• Alternate : The port is attached to a bridge that provides connectivity to the root bridge. It is not
used but is standing by.
• Master : Only exists in MSTP. The port is an MST region boundary port and the single port on the
bridge, which provides connectivity for the Multiple Spanning Tree Instance towards the Common
Spanning Tree root bridge (i.e. this port is the root port for the Common Spanning Tree Instance).
STP Cost
Synopsis: unsigned integer
The total cost of the path to the root bridge composed of the sum of the costs of each link in the
path. If custom costs have not been configured. 1Gbps ports will contribute a cost of four, 100 Mbps
ports will contribute 19 and 10 Mbps ports will contribute 100. For the CIST instance of MSTP, this
is an external root path cost, which is the cost of the path from the IST root (i.e. regional root) bridge
to the CST root (i.e. network "global" root) bridge.
Desig Bridge Priority
Synopsis: integer
The bridge identifier of this bridge.
Desig Bridge MAC
Synopsis: Ethernet MAC address in colon-separated hexadecimal notation
The bridge identifier of this bridge.
28.6. Clearing Spanning Tree Statistics
Figure 28.25. Clear-stp-stats Menu Action