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Sample configuration for Voice and Data deployment on a Switch

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Sample configuration for Voice and Data deployment on a Switch

Case 1: Phone and PC's on different/dedicated switch ports on the switch

Creating VLAN's

Voice VLAN

Switch#conf t

Switch(config)#vlan <VLAN ID>

Switch(config-vlan)#name Voice - description of the VLAN

Similarly for the Data VLAN

Creating VLAN interfaces (SVI's) and assigning IP address to them:

Switch#conf t

Switch(config)#interface vlan <VLAN ID>

Switch(config-if)#ip address <X.X.X.X> <X.X.X.X> - IP address Subnet Mask

(The ip address should be one of the useable IP addresses of the phone or data subnet)

Similarly for the Data VLAN

Interface configuration - Data/Voice

Switch#conf t

Switch(config)#interface GigabitEthernet <interface ID>

Switch(config-if)#switchport mode access

Switch(config-if)#switchport access vlan <VLAN ID> - data VLAN in case of PC

or

Switch(config-if)#switchport voice vlan <VLAN ID> - Voice VLAN in case of phone

If QOS is to be applied

Switch(config)#mls qos  -  Enabline QOS globally on the switch

Switch(config)#interface GigabitEthernet <interface ID>

Switch(config-if)#auto qos voip trust

Case 2: PC's connected via switchport behind the IP phone.

Creating VLAN's

Voice VLAN

Switch#conf t

Switch(config)#vlan <VLAN ID>

Switch(config-vlan)#name Voice - description of the VLAN

Similarly for the Data VLAN

Creating VLAN interfaces (SVI's) and assigning IP address to them:

Switch#conf t

Switch(config)#interface vlan <VLAN ID>

Switch(config-if)#ip address <X.X.X.X> <X.X.X.X> - IP address Subnet Mask

(The ip address should be one of the useable IP addresses of the phone or data subnet)

Similarly for the Data VLAN

Interface configuration - Data/Voice

Switch#conf t

Switch(config)#interface GigabitEthernet <interface ID>

Switch(config-if)#switchport trunk encapsulation dot1q

Switch(config-if)#switchport mode trunk

Switch(config-if)#switchport trunk native vlan <VLAN ID> - Data VLAN

Switch(config-if)#switchport access vlan <VLAN ID> - Voice VLAN


OR

Switch#conf t

Switch(config)#interface GigabitEthernet <interface ID>

Switch(config-if)#switchport trunk encapsulation dot1q

Switch(config-if)#switchport mode access

Switch(config-if)#switchport voice vlan <Voice VLAN ID>

Switch(config-if)#switchport access vlan <VLAN ID>

* With newer IOS it is not required that a switchport connecting a phone piggybacking a PC to be configured as a trunk specifically. Please see the secondary configuration above.

If QOS is to be applied

Switch(config)#mls qos  -  Enabline QOS globally on the switch

Switch(config)#interface GigabitEthernet <interface ID>

Switch(config-if)#auto qos voip trust

Or

Switch(config-if)#auto qos voip trust cisco-phone (specifically for Cisco IP phones)

Note: The above mentioned commands are version specific, however are same or similar in most of the cases.

Comments
Beginner

excellent. thanks for your open contribution. please post some more real time senarios, i mean seriously real time, where you see in companies.that would help someone, like us.

cheers

red

Beginner

Hi,

Could someone confirm if I need the PC with 802.1 authentication which is connected via Avaya phone[without 802.1x authentication].

How should be that possible ?

Thank you!

Beginner

Hello. Some clarifications, if I may:

Switch#conf t
Switch(config)#interface GigabitEthernet <interface ID>
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode trunk
Switch(config-if)#switchport trunk native vlan <VLAN ID> - Data VLAN
Switch(config-if)#switchport access vlan <VLAN ID> - Voice VLAN

What is the point of defining an access vlan above? The switchport is in trunk mode.

Also:

Switch#conf t
Switch(config)#interface GigabitEthernet <interface ID>
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode access
Switch(config-if)#switchport voice vlan <Voice VLAN ID>
Switch(config-if)#switchport access vlan <VLAN ID>

What is the point on defining dot1q encapsulation above, since the switchport mode is access?

 

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