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Bridging
5-18 Bridge Spanning Tree
Path Cost
Displays the cost that this port will contribute to the calculation of the overall
Root path cost in a Configuration BPDU transmitted by this bridge port. You can
lower a port’s Path Cost to make the port more competitive in the selection of the
Designated Port – for example, you may want to assign a lower path cost to a port
on a higher performance bridge. The allowable range is 1 to 65535.
Designated Cost
Displays the cost of the path to the Root Bridge of the Designated Port on the
LAN to which this port is attached. This cost is added to the Path Cost to test the
value of the Root Path Cost parameter received in Configuration BPDUs.
Designated Root
Displays the unique bridge identifier of the bridge that is assumed to be the Root
Bridge.
Designated Bridge
Displays the network address portion of the Bridge ID (MAC address/priority
component) for the bridge that is believed to be the Designated Bridge for the
LAN associated with this port.
The Designated Bridge ID, along with the Designated Port and Port Identifier
parameters for the port, is used to determine whether this port should be the
Designated Port for the LAN to which it is attached. The Designated Bridge ID is
also used to test the value of the Bridge Identifier parameter in received BPDUs.
Designated Port
Displays the network address portion of the Port ID (which includes a
manageable Priority component) of the port believed to be the Designated Port
for the LAN associated with this port.
The Designated Port ID, along with the Designated Bridge and Port Identifier
parameters for the port, is used to determine whether this port should be the
Designated Port for the LAN to which it is attached. Management also uses it to
determine the Bridged LAN topology.
Topology
This indicates how many times the bridge’s Topology Change flag has been
changed since the selected module was last powered up or initialized. The
Topology Change flag increments each time a bridge enters or leaves the network,
or when the Root Bridge ID changes.
Changing Bridge Spanning Tree Parameters
The Bridge Spanning Tree window allows you to update the following
parameters for your bridge. When you have finished making changes to the
following individual parameters, you must click on at the bottom of the
Spanning Tree window to write the changes to the selected module.