Cisco NM-16ESW - EtherSwitch Switch Manuel d'utilisateur télécharger pdf (Page 32)

Configuring the Cisco Gigabit EtherSwitch EHWIC

How to Configure Gigabit EtherSwitch EHWICs

Configuring the Cisco Gigabit EtherSwitch EHWIC

OL-23155-01

3. spanning-tree vlan vlan_ID cost port_cost

4. end

DETAILED STEPS

Calculating Port Cost

Port cost value calculations are based on the bandwidth of the port. There are two classes of values. Short

(16-bit) values are specified by the IEEE 802.1D specification, and range in value from 1 to 65535. Long

(32-bit) values are specified by the IEEE 802.1t specification, and range in value from1 to 200,000,000.

Assigning Short Port Cost Values

You can manually assign short port costs in the range of 1 to 65535. Table 3 lists the default short port

cost values.

Command Purpose

Step 1

interface gigabitethernet 0/slot/port

Example:

Router(config)#interface gigabitethernet 0/1/2

Selects an interface to configure.

Step 2

spanning-tree cost port_cost

Example:

Router(config-if)#spanning-tree cost 50

Configures the port cost for an interface. The value of

port_cost can be from 1 to 65535.

Use the no form of this command to restore the defaults.

Step 3

spanning-tree vlan vlan_ID cost port_cost

Example:

Router(config-if)#spanning-tree vlan 1 cost 50

Configures the VLAN port cost for an interface. The value

of port_cost can be from 1 to 65535.

Use the no form of this command to restore the defaults.

Step 4

end

Example:

Router(config-if)#end

Exits configuration mode.

Table 3 Default Short Port Cost Values

Port Speed Default Cost Value

10 Mbps 100

100 Mbps 19

1000 Mbps 4

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 89 90

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Cisco NM-16ESW - EtherSwitch Switch Manuel d'utilisateur Page 32

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