ETH-TRUNK PORTS GETTING FLAPPED

Hello there,

1. Is there an intermediate device between the two stacks? Please check whether the physical state of the interface is normal;

2. If there is a loop, there may be a problem with the eth-trunk connection, and the interface is closed by STP. Please check the STP status;

3. Please try to switch the connection mode of eth-tunk, such as switching to manual mode or switching the speed mode of LACP;

4. Send the version and log to TAC to see if there is a bug in that version.

I hope this helps.

Normally it dosen't cause issue to use either 10G interfaces or DAC Cable, we've been using regular 10G interfaces for quite some time and didnt faced any issue, 

here are a few thing you can check for yourself quickly, 

- Check what is the physical status of your interfaces X0/0/3 or X0/0/4 when you add ports in stack, (display interface would help) there must be something written ahead of DOWN under status, see what it indicates. 

- Check the log buffer after adding your ports to stack  (run display logbuffer) and check for logs appearing earlier then your port went down

- Once you added your ports to Stack, STP shouldn't effect them but still check the STP Status (display stp brief)

- If there is any intermediate device, check if there is any MTU restrictions on the port, 

- See if you are following the basic rules for stacking Configurations

- if issue still persists then contact your local Huawei TAC with your system's diagnostics.