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5 - 165 IP Telephony v1.0 Lab 2.1.1a Copyright © 2005, Cisco Systems, Inc.
Step 4 Configure the Router Switch Ports
a. Verify the slot into which the router switch four port module inserts by (1) viewing the router and
(2) using the show diag command. Look for the words 4 Port FE Switch.
CMERouterX# show diag
b. Based on the previous step, into what slot does the switch module insert? _________________
c. Use the show ip interface brief command to verify the slot and the format used for the
interface. For example in a 2811 ISR, the four ports list as FastEthernet 0/0/0, 0/0/1, 0/0/2, and
0/0/3.
d. Write the format in which the four ports list. _________________________________________
e. Ports 0 and 1 of the switch module will be used to connect the IP phones. These ports must be
configured as trunk modes, must have the trunking protocol configured, must identify the native
VLAN, and must identify the voice VLAN.
Note that the slot/port-adapter/port parameter that is typed depends on the router slot into which
the four port module inserts.
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 IP phone 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.
IMPORTANT: Note that the following commands must be done on both port 0 and port 1. An
alternative to the interface fastethernet command is interface range fastethernet slot/port-
adapter/port command.
CMERouterX(config)# interface fastethernet slot/port-adapter/port
CMERouterX(config-if)# switchport trunk encapsulation dot1q
CMERouterX(config-if)# switchport trunk native vlan X0 (where X is
the pod number)
CMERouterX(config-if)# switchport mode trunk
CMERouterX(config-if)# switchport voice vlan X5 (where X is the pod
number)
CMERouterX(config-if)# no shutdown
f. What is the purpose of the dot1q parameter used in the previous step? ___________________
____________________________________________________________________________
Step 5 Verify VLAN Configuration
a. From privileged mode on the router, issue the show ip interface brief command and verify that
VLAN1, X0, and X5 (where X is the pod number) have IP addresses and that their status is up
and up.
CMERouterX# show ip interface brief
b. Are all three VLAN interfaces up and up and have the proper IP address? If not, troubleshoot as
necessary. __________
If the interfaces are not there, do not have an IP address or the correct IP address, or if their
status is not up and up, do not proceed until appropriate troubleshooting has been performed.