Patch panel cabling doesn't work after power outage

[szymonsikorski]

We've had a power outage on one of our site impacting a 4 stack of Cat9300 switches. One switch died completely and needs an RMA. The other 3 switches are powered on and stacked correctly.

The weirdest thing is that the patch paneling for that switch no longer works. All the interfaces are down/down but if we bypass the cabling and plug a laptop directly into the switch the interface comes up. 

Has anyone ever had any issues with patch paneling following a power outage? I've never heard of something like that but who knows these days.

[Leo Laohoo]

Post the complete output to the command "sh post".

[szymonsikorski]

Stored system POST messages:

Switch 1
---------

POST: MBIST Tests : Begin
POST: MBIST Tests : End, Status Passed

POST: CRYPTO Tests : Begin
POST: CRYPTO Tests : End, Status Passed

POST: PHY Loopback: loopback Test : Begin
POST: PHY Loopback: loopback Test : End, Status Passed

POST: SIF Tests : Begin
POST: SIF Tests : End, Status Passed

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed

POST: Thermal, Temperature Tests : Begin
POST: Thermal, Temperature Tests : End, Status Passed

POST: Thermal, Fan Tests : Begin
POST: Thermal, Fan Tests : End, Status Passed

Switch 2
---------

POST: MBIST Tests : Begin
POST: MBIST Tests : End, Status Passed

POST: CRYPTO Tests : Begin
POST: CRYPTO Tests : End, Status Passed

POST: PHY Loopback: loopback Test : Begin
POST: PHY Loopback: loopback Test : End, Status Passed

POST: SIF Tests : Begin
POST: SIF Tests : End, Status Passed

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed

POST: Thermal, Temperature Tests : Begin
POST: Thermal, Temperature Tests : End, Status Passed

POST: Thermal, Fan Tests : Begin
POST: Thermal, Fan Tests : End, Status Passed

Switch 4
---------

POST: MBIST Tests : Begin
POST: MBIST Tests : End, Status Passed

POST: CRYPTO Tests : Begin
POST: CRYPTO Tests : End, Status Passed

POST: PHY Loopback: loopback Test : Begin
POST: PHY Loopback: loopback Test : End, Status Passed

POST: SIF Tests : Begin
POST: SIF Tests : End, Status Passed

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Passed

POST: Thermal, Temperature Tests : Begin
POST: Thermal, Temperature Tests : End, Status Passed

POST: Thermal, Fan Tests : Begin
POST: Thermal, Fan Tests : End, Status Passed

Switch 3 is missing as it's being RMAed

[Leo Laohoo]

"sh post" output is fine. 

Get a reputable cabler to test the cable runs.  

[sphillips]

Yes, patch panels can go bad. They have PCBs in them that can melt if the cabling got hot enough. You might also see scorched spots in the RJ45s. Run a basic tester on your runs to make sure all pairs pass before reusing it.