In the older version of 3560/3750, this issue was reported and logged as a bug. Eventually the issue was resolved for the older version of switches. The bug id was CSCsi78581 and it was fixed in 12.2(44)SE.
In newer versions of 3750 switches, same issue was reported but this time the developers confirmed that the process utilization is by design. As documented in bug CSCtn42790
Hulc LED Process - Is responsible for link status detection.
Hulc LED Process uses 15-30% CPU on Catalyst 3560X/3750X platforms.
The is seen in 12.2(53)SE releases or later.
This is an expected behavior and there is no workaround.
Further Problem Description:
The "Hulc LED" process does following tasks:
- Check Link status on every port - If the switch supports POE, it checks to see if there is a Power Device (PD) detected - Check the status of the transceiver - Update Fan status - Set Main LED and ports LEDs - Update both Power Supplies and RPS - Check on system temperature status
The listed bug is correct, the LED process will hover like that. It's the expected behaviour of the and there's not a thing you can do. Least that is what TAC told me.
According to whatyou have posted though, there are other issues. STP process is fairly high, it shouldn't be that high. Once STP is completed, then the process should stay much lower than that - like .0something% not 1.x something%.
That switch is getting pushed because of something and I don't think it's this process.
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