C
HAPTER
33
| Spanning Tree Commands
– 770 –
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.
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 path cost method (page 762) 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)#
spanning-tree edge-
port
This command specifies an interface as an edge port. Use the no form to
restore the default.
SYNTAX
[no] spanning-tree edge-port
DEFAULT SETTING
Disabled
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
Table 102: Default STA Path Costs
Port Type Link Type IEEE 802.1w-2001
Fast Ethernet Half Duplex
Full Duplex
Trunk
200,000
100,000
50,000
Gigabit Ethernet Full Duplex
Trunk
10,000
5,000
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