Cisco NM-16ESW - EtherSwitch Switch Manual de usuario descargar pdf (Pagina 56)

Configuring the Cisco Gigabit EtherSwitch EHWIC

How to Configure Gigabit EtherSwitch EHWICs

Configuring the Cisco Gigabit EtherSwitch EHWIC

OL-23155-01

Configuring the Bridge Table Aging Time

A switch forwards, floods, or drops packets based on the bridge table. The bridge table maintains both

static and dynamic entries. Static entries are entered by you. Dynamic entries are entered by the bridge

learning process. A dynamic entry is automatically removed after a specified length of time, known as

aging time, from the time the entry was created or last updated.

If you are likely to move hosts on a switched network, decrease the aging-time to enable the switch to

quickly adapt to the change. If hosts on a switched network do not continuously send packets, increase

the aging time to keep the dynamic entries for a longer time and thus reduce the possibility of flooding

when the hosts send again.

Beginning in privileged EXEC mode, follow these steps to configure the aging time.

SUMMARY STEPS

1. configure terminal

2. bridge bridge-group aging-time seconds

3. end

DETAILED STEPS

To return to the default aging-time interval, use the no bridge bridge-group aging-time command in

global configuration mode.

Filtering Frames by a Specific MAC Address

A switch examines frames and sends them through the internetwork according to the destination address;

a switch does not forward a frame back to its originating network segment. You can use the software to

configure specific administrative filters that filter frames based on information other than the paths to

their destinations.

You can filter frames with a particular MAC-layer station destination address. Any number of addresses

can be configured in the system without a performance penalty.

Command Purpose

Step 1

configure terminal

Example:

Router#configure terminal

Enters global configuration mode.

Step 2

bridge bridge-group aging-time seconds

Example:

Router(config)#bridge 1 aging-time

Specifies the length of time that a dynamic entry remains in the bridge

table from the time the entry was created or last updated.

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

to 255.

• For seconds, enter a number from 0 to 1000000. The default is 300.

Step 3

end

Example:

Router(config)#end

Returns to privileged EXEC mode.

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Cisco NM-16ESW - EtherSwitch Switch Manual de usuario Pagina 56

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