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11 - 165 IP Telephony v1.0 Lab 2.1.1b Copyright © 2005, Cisco Systems, Inc.
j. Configure the management VLAN subinterface with an IP address appropriate for the
management VLAN. From the subinterface configuration mode, enter the IP address for the
management VLAN based on the information found in IP Telephony Table 1. Use the command
ip address 10.X.0.1 255.255.255.0 command (where X is the pod number).
CMERouterX(config-subif)# ip address 10.X.0.1 255.255.255.0
If a switch was configured with an IP address on the same management VLAN, what would be
the default gateway IP address configured on the switch? ________________________
k. Create a subinterface for the data VLAN by entering the global configuration mode and entering
the command interface fastethernet 0/0.X0 (where X is the pod number). For example, if the
group was assigned to Pod 1, the command would be as follows: interface fastethernet 0/0.10
CMERouterX(config)# interface fastethernet 0/0.X0
l. Configure the subinterface for trunking by entering the command encapsulation dot1q X0
(where X is the pod number) native. The native keyword defines this VLAN as the one that is
not tagged with VLAN information when a frame (from VLAN X0) crosses the trunk between the
router and the switch. This allows the PC that connects to the IP phone to be on a different
subnet than the IP phone and still receive an IP address from a DHCP server. If a warning
message appears, ignore it. If this command does not work, the proper router is not being used.
CMERouterX(config-subif)# encapsulation dot1q X0 native
What is the purpose of the dot1q portion of the command?
___________________________________________________________________
m. Configure the data VLAN subinterface with an IP address appropriate for the data VLAN. From
the subinterface configuration mode, enter the IP address for the data VLAN based on the
information found in IP Telephony Table 1. Use the command ip address 10.X0.0.1
255.255.255.0 command (where X is the pod number).
CMERouterX(config-subif)# ip address 10.X0.0.1 255.255.255.0
If a host was configured on the same data VLAN, what would be the host default gateway IP
address? ________________________________________________________________
n. Create a subinterface for the voice VLAN by entering the global configuration mode, and
entering the command interface fastethernet 0/0.X5 (where X is the pod number).
CMERouterX(config-subif)# interface fastethernet 0/0.X5
o. Configure the subinterface for trunking by entering the command encapsulation dot1q X5
(where X is the pod number).
CMERouterX(config-subif)# encapsulation dot1q X5
p. Configure the voice VLAN subinterface with an IP address appropriate for the voice VLAN. Enter
the IP address for the voice VLAN based on the information found in IP Telephony Table 1. Use
the ip address 10.X5.0.1 255.255.255.0 command (where X is the pod number).
CMERouterX(config-subif)# ip address 10.X5.0.1 255.255.255.0
q. Bring the Ethernet interface to a useable condition.
CMERouterX(config)# interface fastethernet 0/0
CMERouterX(config-if)# no shutdown