Accton Technology VS4512DC Management Manual page 113

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.)
• 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.
• Admin Edge Port – You can enable this option if an interface is attached to a
LAN segment that is at the end of a bridged LAN or to an end node. Since end
nodes cannot cause forwarding loops, they can pass directly through to the
spanning tree forwarding state. Specifying Edge Ports provides quicker
convergence for devices such as workstations or servers, retains the current
forwarding database to reduce the amount of frame flooding required to rebuild
address tables during reconfiguration events, does not cause the spanning tree
to reconfigure when the interface changes state, and also overcomes other
STA-related timeout problems. However, remember that Edge Port should only
be enabled for ports connected to an end-node device.
• Admin Link Type – The link type attached to this interface.
- Point-to-Point – A connection to exactly one other bridge.
- Shared – A connection to two or more bridges.
- Auto – The switch automatically determines if the interface is attached to a
point-to-point link or to shared media.
R
A D
x
Spanning Tree Algorithm Configuration
Backup port receives more
useful BPDUs from the same
bridge and is therefore not
selected as the designated
port.
R
B
3-83