[FS#103] mt7620a leaks traffic during bootloader step

[LEDE Bugs]

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FS#103 - mt7620a leaks traffic during bootloader step
User who did this: john (john)
Summary: Suspected wan port negotation issue in mt7620a switch driver -> mt7620a leaks traffic during bootloader step
Task details edited:
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I have to disconnect LAN cable and reconnect it to get a valid IP address or issue a #ifconfig eth0.1 down then up.
Problem goes away if i reboot router with wan cable disconnected wait for router to load then connect.
When you reboot router with both wan and lan cables connected router's connected lans gets the ip address of the one behind wan cable, in my case took ip 192.168.0.1xx instead of(vs) 192.168.1.1xx but you don’t get internet access.
Something i noticed when i reboot router i don’t see the usual icon for searching for connection on my PC, cable shows always connected, maybe is something to help troubleshoot
And p.s there is nothing wrong with my bootloader because i tested various ones either oem bootloader nor custom compiled local one with latest sources makes the bug go away.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=103