Table 4-65 Default Sta Path Costs; Default Setting - SMC Networks 8126PL2-F - annexe 1 Management Manual

Port Type
Ethernet
Fast Ethernet
Gigabit Ethernet

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
Ethernet
Fast Ethernet
Gigabit Ethernet
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• This command is used by the Spanning Tree Algorithm 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.
• When the spanning-tree pathcost method (page 4-201) is set to short, the
maximum value for path cost is 65,535.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree cost 50
Console(config-if)#
Table 4-64 Recommended STA Path Cost
Link Type IEEE 802.1D-1998
Half Duplex 100
Full Duplex
95
Trunk
90
Half Duplex 19
Full Duplex 18
Trunk 15
Full Duplex 4
Trunk 3
Table 4-65 Default STA Path Costs
Link Type
Half Duplex
Full Duplex
Trunk
Half Duplex
Full Duplex
Trunk
Full Duplex
Trunk
Spanning Tree Commands
IEEE 802.1w-2001
2,000,000
1,999,999
1,000,000
200,000
100,000
50,000
10,000
5,000
IEEE 802.1w-2001
2,000,000
1,000,000
500,000
200,000
100,000
50,000
10,000
5,000
4
4-207