Lab Objective:
Learn how to configure a dual power supply on a Cisco switch.
Lab Purpose:
Business continuity is a hot topic for any corporate network. One aspect of this is dual power supplies, whereby your device can continue to operate when one of the supplies fails. Many are hot-swappable, meaning you can remove and insert them while the device is live.
Lab Tool:
Packet Tracer
Lab Topology:
Please use a Cisco 3650 switch for this lab:
Lab Walkthrough:
Task 1:
Drag a Cisco 3650 model switch onto the canvas. By default, it will have no power supplies connected. Drag two into the blank power bays. The switch should power up.
Task 2:
At the command line, run the show power inline command. Note the available wattage.
Switch#show power inline
Available:780.0(w) Used:0.0(w) Remaining:780.0(w)
Interface Admin Oper Power Device Class Max
(Watts)
——— —— ———- ——- ——————- —– —-
Gig1/0/1 auto off 0.0 n/a n/a 30.0
Gig1/0/2 auto off 0.0 n/a n/a 30.0
Gig1/0/3 auto off 0.0 n/a n/a 30.0
Gig1/0/4 auto off 0.0 n/a n/a 30.0
[output truncated]
Task 3:
Execute the show environment power command. Note the slot naming convention (1A and 1B), the model number (you would use ‘PWR-C2-640WAC‘ to order the replacement), and the serial number (you would quote ‘QIBQWVUF8UX’ for a warranty or support contract). Drops or surges in available power will usually trigger an alert if you have configured monitoring for your devices.
Switch#show environment power
SW PID Serial# Status Sys Pwr PoE Pwr Watts
— —————— ———- ————— ——- ——- —
1A PWR-C2-640WAC QIBQWVUF8UX OK Good Good 640
1B PWR-C2-640WAC DSBEPETTTHB OK Good Good 640
Task 4:
Drag one of the power supplies off the chassis (back to where it came from) and then run the two commands again. Note any changes.
Switch#
Mar 1 00:26:01.678 : %PLATFORM_FEP – 6 – FRU_PS_OIR : Switch 1 : FRU power supply A removed
Switch#show environment power
SW PID Serial# Status Sys Pwr PoE Pwr Watts
— —————— ———- ————— ——- ——- —
1A Not Present
1B PWR-C2-640WAC DSBEPETTTHB OK Good Good 640
Switch#show power inline
Available:390.0(w) Used:0.0(w) Remaining:390.0(w)
Interface Admin Oper Power Device Class Max
(Watts)
——— —— ———- ——- ——————- —– —-
Gig1/0/1 auto off 0.0 n/a n/a 30.0
Gig1/0/2 auto off 0.0 n/a n/a 30.0
Gig1/0/3 auto off 0.0 n/a n/a 30.0
Gig1/0/4 auto off 0.0 n/a n/a 30.0
[output truncated]
Notes:
Your device may ship with only one power supply (such as the switch above), and you would have to pay for additional ones. There are command-line instructions you can input to disable/enable the PSU; however, these are not available on Packet Tracer.
