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Hi

We ran a alternative enhanced stack with 2pcs x695 soft EXOS 31.4.1.5 on the QSFP28 SR4 with MPO connector module and after 2 days at work, on one StackLine we observe rx under the counter. Someone meet with this problem ? Parameters module is fine. All 4 modules in stack line is the same 
 
BR 

Pawel

I've been running Extreme now for 12 years and not once can I recall seeing RX Under get flagged.


Could there be packet fragmentation going on inside your network somewhere passing over these ports?

I suspect you may need to do the same rxerrors command over your whole switch and see if any other ports are reporting the same thing. Maybe you can find the path they are coming in from and trace back to the source? Or alternatively if you can find a source port on this switch and setup a span port and dump to wireshark. You may find it's a single host with a bad network driver.


Original Message:
Sent: 12-21-2021 02:42
From: pbrzostowski
Subject: x695 Alternative Stack

Hi

We ran a alternative enhanced stack with 2pcs x695 soft EXOS 31.4.1.5 on the QSFP28 SR4 with MPO connector module and after 2 days at work, on one StackLine we observe rx under the counter. Someone meet with this problem ? Parameters module is fine. All 4 modules in stack line is the same 

 
BR 

Pawel

Hi  

There are no rx or drop errors on any of the ports in stack 695. Other switches connected to the stack also show no rx errors. I send ticket to GTAC

BR 

Pawel

Original Message:
Sent: 12-22-2021 02:46
From: Brent Addis
Subject: x695 Alternative Stack


Original Message:
Sent: 12-21-2021 02:42
From: pbrzostowski
Subject: x695 Alternative Stack

Hi

We ran a alternative enhanced stack with 2pcs x695 soft EXOS 31.4.1.5 on the QSFP28 SR4 with MPO connector module and after 2 days at work, on one StackLine we observe rx under the counter. Someone meet with this problem ? Parameters module is fine. All 4 modules in stack line is the same 

I've been running Extreme now for 12 years and not once can I recall seeing RX Under get flagged.

Receive Undersize Frames (RX Under)-The total number of frames received by the port that were less than 64 bytes long

The smallest packet size is 64 bytes.
14 bytes (MAC Header) + 46 bytes (Data) + 4 bytes (CRC) = 64 bytes

Could there be packet fragmentation going on inside your network somewhere passing over these ports?

I suspect you may need to do the same rxerrors command over your whole switch and see if any other ports are reporting the same thing. Maybe you can find the path they are coming in from and trace back to the source? Or alternatively if you can find a source port on this switch and setup a span port and dump to wireshark. You may find it's a single host with a bad network driver.

 
BR 

Pawel