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140 - 165 IP Telephony v1.0 SBA Version 1: Copyright © 2005, Cisco Systems, Inc.
Switch1(vlan)# vlan 10 name DATA state active
Switch1(vlan)# vlan 15 name VOICE state active
Switch1(vlan)# exit
i. Configure the switch ports where the IP Phones will be connected. Despite the fact that
the IP Phones do work with access mode ports, Cisco recommends that you configure
the switch ports, connected to the IP Phones, as trunk ports. This way, it is possible to
connect a PC on the IP Phone’s PC Port (this port is present in most of the Cisco IP
Phones). In order to accomplish this task, it is necessary to tell the Switch which of the
created VLANs is the Voice Vlan (switchport voice vlan command) and to specify the
native VLAN on the link between the Switch and the IP Phone. Usually the Native
VLAN on this link will be the DATA VLAN (switchport native vlan command). The
idea is tag the traffic to the IP Phone (IP Phones do support 802.1q) and the traffic
headed to the PC will be be untagged (PC’s do not support tagged packets). Finally,
configure the port connected to the Router as a trunk port.
Switch1(config)# interface range fast0/5 – 10
Switch1(config-if-range)# switchport trunk encapsulation dot1q
Switch1(config-if-range)# switchport trunk native vlan 10
Switch1(config-if-range)# switchport mode trunk
Switch1(config-if-range)# switchport voice vlan 15
Switch1(config-if-range)# no shut
Switch1(config)# interface fast0/1
Switch1(config-if-range)# switchport trunk encapsulation dot1q
Switch1(config-if-range)# switchport mode trunk
Switch1(config-if-range)# no shut
j. Configure the switch2 (connected to R2) in a similar way.
Switch2# delete flash:vlan.dat
Switch2# erase startup-config
Switch2# reload
Switch2# vlan database
Switch2(vlan)# vlan 20 name DATA state active
Switch2(vlan)# vlan 25 name VOICE state active
Switch2(vlan)# exit
Switch2(config)# interface range fast0/5 – 10
Switch2(config-if-range)# switchport trunk encapsulation dot1q
Switch2(config-if-range)# switchport trunk native vlan 20
Switch2(config-if-range)# switchport mode trunk
Switch2(config-if-range)# switchport voice vlan 25
Switch2(config-if-range)# no shut
Switch2(config)# interface fast0/1
Switch2(config-if-range)# switchport trunk encapsulation dot1q
Switch2(config-if-range)# switchport mode trunk
Switch2(config-if-range)# no shut