C
ONFIGURING
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WITCH
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• Port Role – Roles are assigned according to whether the port is part
of the active spanning tree topology:
- Root: The port is connecting the bridge to the root bridge.
- Designated: The port is connecting a LAN through the bridge to
the root bridge.
- Alternate or Backup: A port that may provide connectivity if
other bridges, bridge ports, or LANs fail or are removed.
- Disabled: The role is set to disabled if a port has no role within the
spanning tree.
• 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 STA has been enabled on this interface.
• 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 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 as Admin Edge
port, and is only included for backward compatibility with earlier
products.
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