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2960-L series 48 port switch - Power Over Ethernet (POE) issue

abfisher
Level 1
Level 1

Over the past few years, we have experienced multiple POE issues from ports 41 to 48.  Since we experienced POE issues in the past, we would turn off POE to all other ports that do not require power.  From time to time, we would see our devices go offline and the users would report they had no power.  While trying to troubleshoot this issue, we would power off the switch for 10 to 20 minutes and sometimes it would fix this issue.  Just recently, I discovered port 33 & 34 was the solution to this issue.  At this time, I can only report on port 41 and 42, but I would guess the following ports match up; 43 - 35, 44 - 36, 45 - 37, ect.  Once port 33 and 34 were shut/no shut, the affected POE ports would start working again.  I also discover if you shutdown port 34, port 41 will go down and the same for port 42.

 

To fix this issue;

conf t

int range gi0/33 - 34

shut

no shut

 

Configured switch ports:

ports 1 - 4 POE turned off

ports 5 - 6 POE turned on (almost never an issue)

ports  7 - 40 POE turned off

ports 41 - 48 POE turned on (ports )

 

Switch model:  WS-C2960L-48PS-LL

Current IOS: c2960l-universalk9-mz.152-7.E0a.bin

1 Reply 1

Leo Laohoo
Hall of Fame
Hall of Fame

Upgrade the firmware of the switch first and try again.

A version number that ends with a "0" does not bode well.

Review Cisco Networking for a $25 gift card