Cisco NM-16ESW - EtherSwitch Switch Manuale Utente Scaricare il pdf (Pagina 58)

Configuring the Cisco Gigabit EtherSwitch EHWIC

How to Configure Gigabit EtherSwitch EHWICs

Configuring the Cisco Gigabit EtherSwitch EHWIC

OL-23155-01

Note Only network administrators with a good understanding of how switches and STP function should make

adjustments to spanning-tree parameters. Poorly planned adjustments can have a negative impact on

performance. A good source on switching is the IEEE 802.1d specification.

Changing the Switch Priority

You can globally configure the priority of an individual switch when two switches tie for position as the

root switch, or you can configure the likelihood that a switch will be selected as the root switch. This

priority is determined by default; however, you can change it.

Beginning in privileged EXEC mode, follow these steps to change the switch priority.

SUMMARY STEPS

1. configure terminal

2. bridge bridge-group priority number

3. end

DETAILED STEPS

No no form of this command exists. To return to the default setting, use the bridge bridge-group priority

number command in global configuration mode, and set the priority to the default value. To change the

priority on an interface, use the bridge-group priority command in interface configuration mode

(described in the next section).

Changing the Interface Priority

You can change the priority for an interface. When two switches tie for position as the root switch, you

configure an interface priority to break the tie. The switch with the lowest interface value is selected.

Beginning in privileged EXEC mode, follow these steps to change the interface priority.

Command Purpose

Step 1

configure terminal

Example:

Router#configure terminal

Enters global configuration mode.

Step 2

bridge bridge-group priority number

Example:

Router(config)#bridge 1 priority 50

Changes the priority of the switch.

• For bridge-group, specify the bridge group number. The range is 1

to 255.

• For number, enter a number from 0 to 65535. The default is 32768.

The lower the number, the more likely the switch will be chosen as

the root.

Step 3

end

Example:

Router(config)#end

Returns to privileged EXEC mode.

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Cisco NM-16ESW - EtherSwitch Switch Manuale Utente Pagina 58

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