Voice VLAN Configuration

IT


Telephony configurations have been pre-configured on R1

  1. Configure SW1’s interfaces in the appropriate VLANs.

  2. Configure ROAS for the connection between SW1 and R1.

  3. In simulation mode, ping PC2 from PC1.
    Is the traffic tagged with a VLAN ID?

  4. In simulation mode, call PH1 from PH2. Is the traffic tagged with a VLAN ID?

1. Configure SW1’s interfaces in the appropriate VLANs.

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SW1(config)#int range g1/0/2-3
SW1(config-if-range)#switchport mode access
SW1(config-if-range)#switchport access vlan 10
% Access VLAN does not exist. Creating vlan 10
SW1(config-if-range)#switchport ?
  access         Set access mode characteristics of the interface
  mode           Set trunking mode of the interface
  nonegotiate    Device will not engage in negotiation protocol on this
                 interface
  port-security  Security related command
  protected      Configure an interface to be a protected port
  trunk          Set trunking characteristics of the interface
  voice          Voice appliance attributes
  <cr>
SW1(config-if-range)#switchport voice ?
  vlan  Vlan for voice traffic
SW1(config-if-range)#switchport voice vlan 20
% Voice VLAN does not exist. Creating vlan 20

2. Configure ROAS for the connection between SW1 and R1.

SW1

Note that specifying encapsulation type might be necessary first depending if the switch supports Cisco’s ISL.

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SW1(config)#int g1/0/1
SW1(config-if)#switchport mode trunk

R1

Configure sub interfaces. 

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R1(config)#
R1(config)#int f0/0
R1(config-if)#
R1(config-if)#no shutdown

R1(config-if)#
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

R1(config-if)#int f0/0.10
R1(config-subif)#
%LINK-5-CHANGED: Interface FastEthernet0/0.10, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.10, changed state to up

R1(config-subif)#encapsulation ?
  dot1Q  IEEE 802.1Q Virtual LAN
R1(config-subif)#encapsulation dot1q ?
  <1-4094>  IEEE 802.1Q VLAN ID
R1(config-subif)#encapsulation dot1q 10
R1(config-subif)#ip address 192.168.10.1 255.255.255.0
R1(config-subif)#
R1(config-subif)#int f0/0.20
R1(config-subif)#
%LINK-5-CHANGED: Interface FastEthernet0/0.20, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.20, changed state to up

R1(config-subif)#encapsulation dot1q 20
R1(config-subif)#ip address 192.168.20.1 255.255.255.0
  1. In simulation mode, ping PC2 from PC1.
    Is the traffic tagged with a VLAN ID?

There is no dot1q in the ethernet header. Lack of TPID:0x8100

4. In simulation mode, call PH1 from PH2. Is the traffic tagged with a VLAN ID?

Yes. Packet indicates a dot1q frame.

Also TCI: 0x0014 = VLAN 20.