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Beginner

Catalyst 3560X - Hulc LED process has extremely high CPU utilization

I've seen that many discussions already have been raised about the high CPU utilization of the Hulc LED process on 3560X-48PS. We face the same issue on all of our 3560X with Hulc LED process of around 20% to sometimes 40%. Displaying the process cpu history shows that it is constant around 40%.

We also face performance issues on the devices with the Hulc LED process around 40%. It is the only process with this high utilization.

I read different infos about the purpose of this process, reaching from checking layer 2 traffic to checking the ports (PoE etc.).

Can anyone finally explain:

1. The purpose of the Hulc LED process

2. Why the CPU utilization of 20% is a normal condition ? In my opinion this far to high

3. Can the process be influenced by changing the configs (I read in one post that the command "switchport trunk allowed vlan ...." on the uplinks  solved the problem)

Any hints and tips are very welcome

Regards

Roman 

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Hall of Fame Community Legend

What is the IOS version?

What is the IOS version?

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Beginner

We have different IOS

We have different IOS versions running; we will upgrade coming Sunday to 15.0.2-SE9 (recommended)

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Hall of Fame Community Legend

we will upgrade coming Sunday

we will upgrade coming Sunday to 15.0.2-SE9 (recommended)

Who recommended going to this version (or 15.X version)?  

What was the reason to go to this version?

Highlighted
Beginner

it is Cisco's recommended

it is Cisco's recommended version (see attachment)

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Hall of Fame Community Legend

it is Cisco's recommended

it is Cisco's recommended version (see attachment)

I am familiar what is Cisco's "recommendation" for the 3560G/X & 3750G/X, however, I don't agree with the recommendation.  

For 3560G/E/X &/or 3750G/E/X I would recommend 12.2(55)SE-train due to stability.  

Highlighted
Beginner

Hi Leo

Hi Leo

many thanks for your reply; I fully agree with you; I'm also familiar with the "recommendations", but I have some of the 3560x running with 15.x without any problems.

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