spanning-tree vlan cost

Description

Configures the spanning tree cost for the VLAN. This is the cost to reach the root port.

The no form of this command sets the port cost to the default value.

Command context

config-if

Parameters

<VLAN-LIST>

Specifies the number of a single VLAN, or a series of numbers for a range of VLANs, separated by commas (1, 2, 3, 4), dashes (1-4), or both (1-4,6).

<PORT-COST>

Specifies the spanning tree cost for the VLAN. Range: 1-200,000,000. Default is calculated from the port link speed:

• 10 Mbps link speed equals a path cost of 2,000,000.

• 100 Mbps link speed equals a path cost of 200,000.

• 1 Gbps link speed equals a path cost of 20,000.

• 2 Gbps link speed equals a path cost of 10,000.

• 10 Gbps link speed equals a path cost of 2,000.

• 100 Gbps link speed equals a path cost of 200.

• 1 Tbps link speed equals a path cost of 20.

Authority

Administrators

Examples

Setting port cost:

switch# config
switch(config)# interface 1/1/1
switch(config-if)# spanning-tree vlan 5 cost 100000

Setting port cost to the default:

switch# config
switch(config)# interface 1/1/1
switch(config-if)# no spanning-tree vlan 5 cost