Lab Objective:
The objective of this lab exercise is to learn and understand how power over ethernet enables connections to devices that can draw their power source from the network.
Lab Purpose:
PoE is a technology used for wired Ethernet LANs that enables electrical current to be carried over data cables as an alternative to a power cord. PoE is used for technology such as voice over IP phones, IP cameras and wireless access points. As corporate and SME networks are moving towards IP telephony, providing power over the network to these devices has become very popular. You will need access to PoE switch for this lab, such as a 3560 (or use Packet Tracer).
Lab Tool:
Packet Tracer.
Lab Topology:
Please use the following topology to complete this lab exercise.
Task 1:
Configure the hostnames on PoE switch Sw1 as illustrated in the topology. 3560-24PS is a PoE switch if you are using Packet Tracer. You learned how to do this in earlier labs.
You will need to click on the IP Phone and drag the power cable to the interface.
Task 2:
Connect Cisco IP phone to Switch using an Ethernet cable. Use 7960 IP phone if you are using packet tracer.
NOTE: This lab is done using packet tracer as 3560 is a PoE switch. So, once you make the connection between an IP phone and switch, IP phone will start automatically.
Task 3:
Use the relevant show commands to verify the power supplied to Cisco IP phone. Your output may differ from mine but the connected interface should be drawing power. A Fast Ethernet connection is shown in the network topology but you may have connected using a Gigabit Ethernet port which is shown in the below output.
Sw1>enable
Sw#show power inline
Available:370.0(w) Used:10.0(w) Remaining:360.0(w)
Interface Admin Oper Power Device Class Max
(Watts)
——— —— ———- ——- ——————- —– —-
Fa0/1 auto on 10.0 Switch 7960 3 15.4
Fa0/2 auto off 0.0 n/a n/a 15.4
Fa0/3 auto off 0.0 n/a n/a 15.4
[Output Truncated]
Switch#show power inline gigabitEthernet 1/0/1
Interface Admin Oper Power Device Class Max
(Watts)
——— —— ———- ——- ——————- —– —-
Gi1/0/3 auto on 30.0 Ieee PD 4 30.0
Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
———- ————— ——————–
Gi1/0/3 30.0 15.4
NOTE: Some of this output is from a live Cisco switch C2960X. Packet Tracer doesn’t support this command.
Task 4:
Specify the maximum power to offer on an interface.
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#interface gigabitethernet 1/0/6
Switch(config-if)#power inline auto max 20000
Switch(config-if)#end
Switch#
NOTE: This output is from Cisco switch C2960X. Packet Tracer doesn’t support this command.
Switch#show power inline gigabitEthernet 1/0/6
Interface Admin Oper Power Device Class Max
(Watts)
——— —— ———- ——- ——————- —– —-
Gi1/0/6 auto off 0.0 n/a n/a 20.0
Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
———- ————— ——————–
Gi1/0/6 20.0 15.4
Note:
We illustrated some commands using a live switch, but if you are using Packet Tracer, just use the ones available to you.
