So I'm in a bit of a pickle...
I've been following this thread for a while, got a few LB6Ms for a LAB environment, and I'm having an issue with one after flashing it.
Well that's certainly interesting. If you answer each question below we should hopefully be able to fix this quick
1. Do you have other flashed LB6M's plugged in while trying to set up and ping/use this broken LB6M? If so they all have the same mac address if you haven't changed it, which would explain these issues. You say that you couldn't even make contact using the IN band management, which tells me it's some kind of software or network issue
2. Stupid question, but the IP you're assigning the switch is in the same subnet as the tftp server right? and you're sure it's plugged into mgmt port 1, not 2?
3. In the brocade bootloader on the broken switch, run the below command. It should reboot back into the bootloader, now with a fresh valid MAC. Give it an IP and try pinging out to something in the same subnet again. If it still fails, try the t2 ethernet test, then try again.
set ether-address 748e.f8e2.d200
#pull power, then re-power. the "reset" command doesn't work in brocade BL so it can't be used
If it's not a MAC conflict with your other flashed switches, it could potentially be it using an invalid MAC. it tries to pull the chassis MAC address from EEPROM, when it sees the garbage data in there leftover from Quanta it should ignore it, but I guess it's possible that's not happening. The above command would resolve that
4. If all the above fails, try a different ethernet cable of a different length, plugged into a different switch/endpoint if you have one. If you're using a shorter cable, find a longer one, vice versa. If it IS your mgmt port refusing to work with the brocade fw EQ/clock values, changing the impedance/distance on the ethernet side has a slim chance of helping
Try all that and let me know what happens. Worst case it shouldn't come to JTAG. The units can be quite expensive with the right firmware on ebay. Another STH user completely bricked his, he shipped it to me and back so I could JTAG it, I think it cost him $40 total. I'd be willing to do the same for your chassis (if you're in the USA) if we can't get it figured out