LevelOne GSW-2692 manual Ad B

Spanning Tree Algorithm Configuration 3

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

ADB

x

•Trunk Member – Indicates if a port is a member of a trunk. (STA Port Information only)

These additional parameters are only displayed for the CLI:

•Admin status – Shows if this interface is enabled.

•Path cost – 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.)

•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 likely to be blocked if the Spanning Tree Algorithm is detecting network loops. Where more than one port is assigned the highest priority, the port with the lowest numeric identifier will be enabled.

•Designated root – The priority and MAC address of the device in the Spanning Tree that this switch has accepted as the root device.

•Fast forwarding – This field provides the same information as Admin Edge port, and is only included for backward compatibility with earlier products.

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