ECS4110-28T_Management Guide

C HAPTER 35 | Spanning Tree Commands
– 1105 –
RELATED COMMANDS
spanning-tree edge-port (1106)
spanning-tree spanning-disabled (1114)
spanning-tree cost This command configures the spanning tree path cost for the specified
interface. Use the no form to restore the default auto-configuration mode.
SYNTAX
spanning-tree cost cost
no spanning-tree cost
cost - The path cost for the port. (Range: 0 for auto-configuration,
1-65535 for short path cost method, 1-200,000,000 for long path
cost method)
27
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)
Table 137: Recommended STA Path Cost Range
Port Type Short Path Cost
(IEEE 802.1D-1998)
Long Path Cost
(IEEE 802.1D-2004)
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
27. Use the spanning-tree pathcost method command to set the path cost method. The range
displayed in the CLI prompt message shows the maximum value for path cost. However,
note that the switch still enforces the rules for path cost based on the specified path cost
method (long or short).
Table 138: Default STA Path Costs
Port Type Short Path Cost
(IEEE 802.1D-1998)
Long Path Cost
(IEEE 802.1D-2004)
Ethernet 65,535 1,000,000
Fast Ethernet 65,535 100,000
Gigabit Ethernet 10,000 10,000