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User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
552
spanning-tree cost
This command configures the spanning tree path cost for the specified interface. Use the no form to restore the default.
Syntax
spanning-tree cost cost no spanning-tree cost
(Range: 0 for auto-configuration, 1-65535 for short path cost method23, 1-200,000,000 for long path cost method)
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 5-63 Recommended STA Path Cost Range
Use the spanning-tree pathcost method command on page 4-206 to set the path cost method.
Port Type Link Type IEEE 802.1D-1998 IEEE 802.1w-2001
Ethernet Half
DuplexFull
DuplexTrunk
100
95
90
2,000,000
1,999,999
1,000,000
Fast Ethernet Half
DuplexFull
DuplexTrunk
19
18
15
200,000
100,000
50,000
Gigabit
Ethernet
Full
DuplexTrunk
4
3
10,000
5,000
Table 5-64 Recommended STA Path Cost
Default Setting
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 Link Type IEEE 802.1w-2001
Ethernet Half Duplex
Full Duplex
Trunk
2,000,000
1,000,000
500,000
Fast Ethernet Half Duplex
Full Duplex
Trunk
200,000
100,000
50,000