What's wrong with the rb750r2??

RouterOS General
1

I install a lot of RB750 without any problem.
The rb750r2 with exactly the same configuration have a high RMA. All exactly have the same symptom: all LEDs off, and is only accessible by pressing the reset button…

The setup is simple: Bridge over all ports, IP over the bridge, and a MAC bridge filter / filter. Nothing more …
Even today, I upgrade 6.27 to 6.30.2 was the same …all leds off, and RB750r2 dead…

I will not install more RB750r2 until this problem is solved (this problem did not exist with RB750)

2

indeed, I believe that the fatal error occurs when attempting reboot

3

We have tested hEX lite on our lab and have not managed to reproduce issue like one that you mentioned.

You mentioned that router is only accessible if you press reset button. Did you mean that you reset router or do you run backup bootloader?

Can you please send supout file to support@mikrotik.com with your configuration? It sounds like issue might be triggered with specific configuration so we need to see it in order to reproduce issue and after that fix it.

4

Thank you very much for answer.
I am not able to access the router after the fault by IP address (mac telnet and mac winbox are always disabled in my configuration, but the LEDs are off when it fails, so I think that is impossible to access, I do not know…)

To get access again, I push the back button to restore factory settings. It’s the only way I found.

I can not generate the supout.rif because I can not access the router, but if I can send you an identical supout.rif from a router that is working with exactly the same configuration.

Now I have here a router with this problem. I do not have access (all leds off). Do you wish to do some testing with it? (I do not know how). I am very interested to solve this problem, I can try send you the router (for free) if you give me an address.

Note.- All untis have 6.27 when fail.

The config that I use is:
(executed under default configuration)
/interface set 0 name=ether1
/interface set 1 name=ether2
/interface set 2 name=ether3
/interface set 3 name=ether4
/interface set 4 name=ether5

/interface ethernet
set [ find default-name=ether3 ] master-port=none
set [ find default-name=ether4 ] master-port=none
set [ find default-name=ether5 ] master-port=none

/interface bridge
add mtu=1500 name=bridge1
/ip neighbor discovery
set ether1 discover=no
set ether2 discover=no
set ether3 discover=no
set ether4 discover=no
set ether5 discover=no
set bridge1 discover=no

/interface bridge filter
add chain=forward disabled=yes in-interface=ether2 out-interface=ether1 src-mac-address=00:00:00:00:00:00/FF:FF:FF:FF:FF:FF
add chain=forward disabled=yes in-interface=ether3 out-interface=ether1 src-mac-address=00:00:00:00:00:00/FF:FF:FF:FF:FF:FF
add chain=forward disabled=yes in-interface=ether4 out-interface=ether1 src-mac-address=00:00:00:00:00:00/FF:FF:FF:FF:FF:FF
add chain=forward disabled=yes in-interface=ether5 out-interface=ether1 src-mac-address=00:00:00:00:00:00/FF:FF:FF:FF:FF:FF
add action=drop chain=forward disabled=yes in-interface=ether2 out-interface=ether1
add action=drop chain=forward disabled=yes in-interface=ether3 out-interface=ether1
add action=drop chain=forward disabled=yes in-interface=ether4 out-interface=ether1
add action=drop chain=forward disabled=yes in-interface=ether5 out-interface=ether1
add chain=forward in-interface=ether1
add chain=forward out-interface=ether1
add action=drop chain=forward
add action=drop chain=input disabled=yes in-interface=!ether1

/interface bridge port
add bridge=bridge1 interface=ether1
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
add bridge=bridge1 interface=ether5
/ip firewall connection tracking
set enabled=no
/ip address
add address=172.16.0.100/20 interface=bridge1 network=172.16.0.0
/ip dns
set allow-remote-requests=yes servers=172.16.0.1
/ip route
add distance=1 gateway=172.16.0.1
/ip upnp
set allow-disable-external-interface=no
/snmp
set trap-community=public
/system watchdog
set automatic-supout=no
/system clock
set time-zone-autodetect=no
/system clock manual
set time-zone=+02:00
/system identity
set name=“Switch RB750 172.16.0.100”
/system ntp client
set enabled=yes primary-ntp=188.40.42.71 secondary-ntp=185.18.149.149
/tool mac-server
set [ find default=yes ] disabled=yes
add disabled=yes interface=ether2
add disabled=yes interface=ether3
add disabled=yes interface=ether4
add disabled=yes interface=ether5
set 0 disabled=yes
set 1 disabled=yes
set 2 disabled=yes
set 3 disabled=yes
set 4 disabled=yes
/tool mac-server mac-winbox
set [ find default=yes ] disabled=yes
add disabled=yes interface=ether2
add disabled=yes interface=ether3
add disabled=yes interface=ether4
add disabled=yes interface=ether5
set 0 disabled=yes
set 1 disabled=yes
set 2 disabled=yes
set 3 disabled=yes
set 4 disabled=yes

/ip dhcp-client remove 0
/ip dhcp-server remove 0
/ip dhcp-server network remove 0
/ip pool remove 0
/ip firewall nat remove 0
/ip service set www disabled=no
/ip address remove 0

5

How do you perform upgrade? Do you use “/system package update” or do you simply upload/download file to router and then reboot it?

I did just test your configuration and router works after upgrade without any problems for me.

Is there something else what you might have forgotten to say about this configuration?

6

Hi,
I use /system package update, because this router was installed in a client.

There is no more relevant information… I just upgrade and reboot… and then it die with all leds off.
One script that I cut in the previus script, was a reboot every four days (and I think that others routers die at reboot, but I can not be sure)

All routers have 6.27 and routerboard firmware updated.
If I push reset button to get default configuration, the router can be used again without problems, it’s mean, the router is not damaged

7

Once installed, I only access to the router to:

  • Enable or disable ether ports (to add or delete customers access)
  • Set mac address in bridge filter to allow only router mac address of the customer
    and just this. There is no other uses.

I use winbox to access. In a first step I use Chrome, and when I see that is RouterOS (and not SWOS), I close Chrome and use Winbox only (old Winbox version)

8

Hi,
I have news. This week has died two rb750r2. Neither has been recovered with the reset button. They definitely dead. But one of them we know why:

First one:
It was powered by poe in ether1. Power contacts in RJ45 POE works perfectly, but data contacts of POE was wrong. That is, the link: on/off/on/off/on/off… That killed the RB750vr2. Now the USR is: off/ a bit on / fully on. Changes in these three states.

The second:
The USR light is always off, and we don’t know why fail.

Reset button, has no effect…

Until now:
0 units fail RB750 / RMA (I have many installed)
6 units fail RB750vr2 / RMA (I have only installed a few)
(identical use and configuration)

9

You can try to see if your device is damaged by overvoltage. See the this PDF file for instructions (the file is usually provided to distributors)

http://www.mikrotik.com/download/share/overvoltage_guide_2015_08_06.pdf

10

I used a passive poe + original 12v RB750r2 power adapter.
I test power adapter, and it’s OK

Finally, the RJ45 cable was OK, the fault was in previus 260GS, that don’t work well, and all ether ports of this switch was wrong with continues link on/link off, and in some way, kill the RB750r2

11

Every week, 1-3 RB750r2 dies… all IN THE SAME WAY.

There is obviously a serious problem. Mikrotik not recognize the problem and does not give a solution.
How many warnings are required for Mikrotik to accept the problem?
Please … a solution!

12

I’ve got the same problem! RB750r2 just died! All Leds OFF.

13

I reinstalled 260GS for avoid this. Mikrotik denies the problem so RB750r2 is not a option at this moment for me…

14

I also just had a horrible experience with the RB750Gr2. I powered it up and updated it to current firmware and bootloader.
I set it up for the client and powered it off. I arrived at clients and hooked up the Ethernet cables and applied power and only the PWR light came on. No beep or USR light or eth lights. Tried different power supplies with same result. I unplugged all of the Ethernet cables and retried and got it to boot once. I commanded a reboot from Winbox and then it went into a reboot loop. Then I managed to do a Netinstall but in the process the license was destroyed even though I had netinstall keep existing. So now if I can get it to actually do a bootup it has no license. Something is seriously wrong in the software or hardware and it really needs to be addressed.

15

Hi guys, I just ran into this - still investigating, but the device will power back up if you leave it unpowered for over a minute or two. then any reboot or power cycle following will reproduce the non-booting issue. I’ll continue mucking around with it. EDIT: rb750gr2 here. network tech was just turning it into a bridge.

16

I have a mountain of broken rb750r2. Today one more fail.
My dealer knows this problem. It is general.

Mikrotik, will be honest tell us the problem, to identify and to replace the affected units installed in our customers…

17

factory reset it with reset button held down, mac-winboxed in and ensured was reset, presented with option to remove configuration, etc… still locks up after power cycle, only USR light shows up. Have to wait another 2 min or so to boot. Going to try netinstall if I can get it into that mode.

18

did we have any official response for the problems?
I need to buy many not expensive routers with 64ram and I thought it was great idea to buy this one but I am afraid I will not.

19

i only see a couple of user reporting issues

i think is a specific issue not with the equipment

i have some rb750gr2 working without problems

20

After much research, I know which is the reason.
The difference between my failed configuration, and others, is that I do a reboot every 3 days (scheduled) . If reboot is not done, I think it does not fail.

I think there is a random problem at boot the units.