Help with "SCHAN errors detected on SoC unit 1" messege.

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(B2H124-48P - Fw:04.02.13.0003)
Who can help me with the mean of the following message:
<162>Jan  1 00:00:00 10.248.0.20-1 UNKN[203503288]: broad_system.c(3605) 1190333 %% 7 SCHAN errors detected on SoC unit 1
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Pedro Sebastiao

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Posted 4 years ago

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Jason Parker, Employee

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Please open a ticket with the GTAc. Is this reproducible? Thanks
Jason
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Pedro Sebastiao

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Yes, it is happening every time (several times per hour).
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Jason, Employee

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Please read the submitted article on the Hib
C2/B2/A2-Series with Errors Detected on SoC Unit
Then contact support to isolate root cause
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Patrick M

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Jason, is there any solution other than RMA?  I have had to RMA many switches for SCHAN issues.
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Jason, Employee

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Patrick
I was looking to get this documented in the GTAC
Some history
Some customer of lab people have only seen this on time
Some customers have cleared the configuration and put it back on the switch
Getting this documented (as we have not consistently seen the issue could help
Other Lessions could be learned such as
If you pulled certain ports and the issue stopped but put it back on could let us know if we are handling the packets the wrong way
We are not trying to put through any pain but maybe this could help us determine the root cause that it could help all customers
Your thoughts
Jason
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Patrick M

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I normally see parity errors on the console during system boot diagnostics along with the SCHAN errors and have always assumed hardware issues with the memory subsystem and RMAs have always been handled without question.

You are correct that unplugging and plugging ports can force the generation of error messages.  When traffic does flow, performance is very poor.   SCHAN errors can be seen on a test bench with minimal traffic, e.g. a single laptop connected to the switch with no other traffic.  The SCHAN errors will normally appear immediately.

I would imagine that I would have tried clearing the configuration and concluded that that did not help, but I will certainly try that again when I next see a switch with SCHAN errors.
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Jason Parker, Employee

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Please note that we are trying to improve what is hardware vs. software issues . Here is another article to review
https://community.extremenetworks.com/extreme/topics/c5-c3-b5-b3-series-firmware-resolution-for-dma-...

Jason