high CPU Utilization in WS-C2960X-24TS-L

[Ranjan Singh]

Hi ,

I have WS-C2960X-24TS-L  model and i can observe CPU utilization always remain more than 22% in all X model Switches.Currently It  carries 15.2(2)E3 IOS and to also I have uploaded latest IOS on it but Utilization never comes down.

I have observed Hulc LED Proces is the bottleneck and taking high CPU process.

Please help us to reduce it.

[Georg Pauwen]

Hello,

apparently, this is normal behavior:

Hulc LED Process uses 6-23% CPU on Catalyst 2960/2960S/2960X switch
CSCtg86211
Description
Symptom:
Hulc LED Process uses 6-23% CPU on Catalyst 2960/2960S/2960X 24 or 48-port switch.

Conditions:
The CPU utilization for Hulc LED Process will be in the 6-23% range for the
Catalyst 2960 series like 2960, 2960S, 2960X switch models.

For WS-C2960X-48LPS-L which is 48ports PoE 2960X switch Hulc LED Process
Could reach about 22%-23%.

The is seen in 12.2(50)SE03 or later releases.

Workaround:
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

[nwrsm-delhi]

Hi gpauwen,

What if it comes at a specific period of time and it goes directly from 30% to 90%.

Although this is a bug but there must be some workaround to resolve it.

Please find attached.

[Georg Pauwen]

Hello, 

30 to 90 percent is high, too high actually to be blamed on the bug...

Try and shut down all unused ports, that should bring CPU utilization down at least some.