SMC Networks SMC6824M manual 167, Ad B

SPANNING TREE ALGORITHM CONFIGURATION

bridges, bridge ports, or LANs fail or are removed. The role is set to disabled (i.e., disabled port) if a port has no role within the spanning tree.

Alternate port receives more useful BPDUs from another bridge and is therefore not selected as the designated

port.R

R: Root Port

A:Alternate Port

D:Designated Port

B:Backup Port

R

AD B

x

Backup port receives more useful BPDUs from the same bridge and is therefore not selected as the designated

port.

RR

AD B

x

• Trunk Member11 – Indicates if a port is a member of a trunk. These additional parameters are only displayed for the CLI:

•Admin Status – Shows if this interface is enabled.

•External path cost – The path cost for the IST. This parameter is used by the STA to determine the best path between devices. Therefore, lower values should be assigned to ports attached to faster media, and higher values assigned to ports with slower media. (Path cost takes precedence over port priority.)

•Internal path cost – The path cost for the MST. See the preceding item.

•Priority – Defines the priority used for this port in the Spanning Tree Algorithm. If the path cost for all ports on a switch is the same, the port with the highest priority (i.e., lowest value) will be configured as an active link in the Spanning Tree. This makes a port with higher priority less

11.STA Port Information only.

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