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User’s Manual of WGSW-24040 / WGSW-24040R
SGSW-24040 / SGSW-24040R
114
path cost ports are chosen as forwarding ports in favor of higher path cost ports.
Valid values are in the range 1 to 200000000.
• Priority
Controls the port priority. This can be used to control priority of ports having
identical port cost. (See above).
Default: 128
Range: 0-240, in steps of 16
• Edge
Controls whether the port is known to connect directly to edge devices. (no
Bridges attached). The Edge flag is cleared by receipt of any BPDUs on the port.
Transitioning to the forwarding state is faster for edge ports than for other ports.
(This applies to physical ports only. Aggregations are always Non-Edge).
• Point2Point
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.
Transitions 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).
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 4-7-1 Recommended STP Path Cost Range
Port Type Link Type IEEE 802.1D-1998 IEEE 802.1w-2001
Ethernet
Half Duplex
Full Duplex
Trunk
100
95
90
2,000,000
1,999,999
1,000,000
Fast Ethernet
Half Duplex
Full Duplex
Trunk
19
18
15
200,000
100,000
50,000
Gigabit Ethernet
Full Duplex
Trunk
4
3
10,000
5,000
Table 4-7-2 Recommended STP Path Costs