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Configuring the Cisco Gigabit EtherSwitch EHWIC

How to Configure Gigabit EtherSwitch EHWICs

Configuring the Cisco Gigabit EtherSwitch EHWIC

OL-23155-01

Voice Traffic and VVID

The Cisco Gigabit EtherSwitch EHWIC can automatically configure voice VLAN. This capability

overcomes the management complexity of overlaying a voice topology onto a data network while

maintaining the quality of voice traffic. With the automatically configured voice VLAN feature, network

administrators can segment phones into separate logical networks, even though the data and voice

infrastructure is physically the same. The voice VLAN feature places the phones into their own VLANs

without the need for end-user intervention. A user can plug the phone into the switch, and the switch

provides the phone with the necessary VLAN information.

Configuring a Single Subnet for Voice and Data

For network designs with incremental IP telephony deployment, network managers can configure the

Cisco Gigabit EtherSwitch EHWIC so that the voice and data traffic coexist on the same subnet. This

might be necessary when it is impractical either to allocate an additional IP subnet for IP phones or to

divide the existing IP address space into an additional subnet at the remote branch. It might be necessary

to use a single IP address space for branch offices. (This is one of the simpler ways to deploy IP

telephony.)

This configuration approach must address two key considerations:

• Network managers should ensure that existing subnets have enough available IP addresses for the

new Cisco IP phones, each of which requires a unique IP address.

• Administering a network with a mix of IP phones and workstations on the same subnet might pose

a challenge.

Beginning in privileged EXEC mode, follow these steps to automatically configure Cisco IP phones to

send voice and data traffic on the same VLAN.

Step 3

interface type 0/slot/port

Example:

Router(config)#interface gigabitethernet

0/3/1

Enters the interface configuration mode and the port to be

configured.

Step 4

switchport mode trunk

Example:

Router(config-if)#switchport mode trunk

Configures the port to trunk mode.

Step 5

switchport voice vlan vlan-id

Example:

Router(config-if)#switchport voice vlan 1

Configures the voice port with a VVID that will be used

exclusively for voice traffic.

Step 6

end

Example:

Router(config-if)#end

Returns to privileged EXEC mode.

Command Purpose

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