Instruction Manual
72
Applying Changes to STP Port Setting
This page allows you to configure STP Port Settings on a per port basis.
1.
On the STP Port Setting page, enter the following information:
•
Port Select :
Select port number from this drop-down list.
•
External Cost (0 = Auto):
Controls the path cost incurred by the port.
The Auto setting will set the path cost as appropriate by the physical link
speed, using the 802.1D recommended values. Using the Specific setting, a
user-defined value can be entered. The path cost is used when establishing
the active topology of the network. Lower path cost ports are chosen as
forwarding ports in favor of higher path cost ports. Valid values are in the
range 1 to 200000000.
•
Edge Port
: Controls whether the operEdge flag should start as being set or
cleared (The initial operEdge state when a port is initialized).
•
BPDU Filter:
Control whether a port explicitly configured as Edge will
transmit and receive BPDUs.
•
BPDU Guard:
Control whether a port explicitly configured as Edge will
disable itself upon reception of a BPDU. The port will enter the error-
disabled state, and will be removed from the active topology.
•
P2P MAC:
Controls whether the port connects to a point-to-point LAN
rather than a shared medium. This can be automatically determined, or
forced either true or false. Transition to the forwarding state is faster for
point-to-point LANs than for shared media.
Note:
This applies to physical ports only. Aggregations are always forced
Point-to-Point.
•
Migrate:
If at any time the switch detects STP BPDUs, including
Configuration or Topology Change Notification BPDUs, it will automatically
set the selected interface to forced STP compatible mode. However, you can
also use the Protocol Migration button to manually re-check the appropriate
BPDU format (RSTP or STP compatible) to send on the selected interfaces.
The default setting is unchecked.
2.
Click on the
Apply
button to apply the port changes.
By default, the system automatically detects the speed and duplex mode used
on each port, and configures the path cost according to the values shown below.
Path cost “0” is used to indicate auto-configuration mode. When the short path
cost method is selected and the default path cost recommended by the IEEE
