User Manual

User’s Manual of LRP-422CST
Object Description
 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.
(This applies to physical ports only. Aggregations are always forced Point2Point).
 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.
(Default: Disabled)
Buttons
: Click to apply 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 8021w standard exceeds 65,535, the default is set to
65,535.
Port Type IEEE 802.1D-1998 IEEE 802.1w-2001
Ethernet
50-600 200,000-20,000,000
Fast Ethernet
10-60 20,000-2,000,000
Gigabit Ethernet
3-10 2,000-200,000
Table 4-6-1 Recommended STP Path Cost Range
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