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posh4529
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A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Wed Jul 31, 2019 11:13 pm

Hi everybody!

Today I had enough free time as I thought to update the RouterOS on my 2 Mikrotik routers from ver.6.45.1 to ver.6.45.2. So I did it as usal. Just copied new OS files from the appropriate section on Mikrotik official website (https://mikrotik.com/download) devoted to RB4011 to the router file destination (Files\File list) and rebooted. What a great surprise I had finding out after reboot and upgrade that I had lost access to Internet. After carefull review I found out that my router lost it's ability to obtain the ip-address from ISP via DHCP. As my ISP provides dynamic ip-addresses only by DHCP that was really a quest. What made the situation worse was that I had not only upgraded the RouterOS but the firmware too. Now I know it's a bad habbit to upgrade both of them. Will never do such reckless things again. The good point was I always make backups in .backup and .rsc. So all configurations were safe. Buttt!!! It was a real brainstorm how to downgrade the firmware. As to the RouterOS - there was no problem and the process is clearly described in many sources. But I did a long investigation on third-party forums how to downgrade the firmware. Now I want to address to the Mikrotik support team. Why is there no information on Mikrotik official website? Please do your job. If anyone encounters such a problem - the issue is as follows:
1. Downgrade the RouterOS to the needed version (you can find the version you need here: https://mikrotik.com/download/archive).
2. In New terminal window type: system routerboard upgrade (Yes,yes. This is not a mistake. You have to type not DOWNGRADE but UPGRADE!!! Though in fact your firmware will be downgraded to the current RouterOS version that you have downgraded to in the 1 step.
3. After a promt DO YOU REALLY WANT TO UPGRADE THE FIRMWARE Y/N just type Y and the firmware will downgrade!
4. Reboot the router.
5. Done.
But my bad luck at this time was not gone. After downgrading both firmware and RouterOS to the previous version my router still refused to obtain the ip-address from the ISP via DHCP. I got in touch with the ISP support and they checked that the switch port my RB is connected to is set properly (negotiation off, speed-duplex force1g-full nonegotiate slave) as only such settings work in RB4011 SFP+ cage when using SFP 1G modules. After the ISP confirmed that the settings meet my requirements I unplugged the RB4011 (pay attention, not rebooted but unplugged. As it turned out that on reboot the SFP module stays powered on) and in a minute plugged in again. The RB4011 booted and at this time obtained the ip-address via DHCP correctly without any issues.
I don't know what the Mikrotik engineers did wrong but I do strongly advise you not to update to RoterOS version 6.45.2 and keep away from it. They call it stable but my experience shows it's faulty. Hope all Mikrotik users are the same level skilled as me otherwise there are not so many ISPs who can or will offer as skilled support. My e-mail is SL4529@GMAIL.COM if you have similar issues or any questions left.
Last edited by posh4529 on Thu Aug 01, 2019 9:06 am, edited 1 time in total.
 
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mozerd
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Thu Aug 01, 2019 12:16 am

But my bad luck at this time was not gone. After downgrading both firmware and RouterOS to the previous version my router still refused to obtain the ip-address from the ISP via DHCP. I got in touch with the ISP support and they checked that the switch port my RB is connected to is set properly (negotiation off, speed-duplex force1g-full nonegotiate slave) as only such settings work in RB4011 SFP+ cage when using SFP 1G modules. After the ISP confirmed that the settings meet my requirements I unplugged the RB4011 (pay attention, not rebooted but unplugged. As it turned out that on reboot the SFP module stays powered on) and in a minute plugged in again. The RB4011 booted and at this time obtained the ip-address via DHCP correctly without any issues.
thank you for posting your observations .... especially the part where you UNPLUGGED then after a minute plugged in again and this time your SFP+ INTERFACE obtained the ip. very interesting indeed.

Can you please tell us which SFP MODULE you are using? Is it the one provided by your ISP or one that you purchased?
 
posh4529
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Thu Aug 01, 2019 8:59 am

The SFP module I'm using is a local brand (SNR) used by my ISP. So I had not so much of a choice unless use the one advised by my ISP. All I can say it's parameters on my side are TX 1550 RX 1310.
 
TimurA
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Thu Aug 01, 2019 9:54 am


But my bad luck at this time was not gone. After downgrading both firmware and RouterOS to the previous version my router still refused to obtain the ip-address from the ISP via DHCP.
Hi, at 6.45.1 there is such a problem, if the switch of the ISP is turned off and turned on after a short period, due to the loss of light, let's say. You have to pull the sfp module manually.

Put 6.46beta16 - there is no such problem.

PS
6.45.2 complete shit for RB4011
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IYARINDRA
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Thu Aug 01, 2019 9:53 pm

Maybe you might wanna try 6.45.3
I saw it on the main download page but have not updated need to download manually I think.
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But for me 6.44.3 is my most stable at the moment.
 
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Jotne
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Thu Aug 01, 2019 11:37 pm

6.45.3

*) rb4011 - fixed SFP+ interface linking (introduced in v6.45.2);
 
How to use Splunk to monitor your MikroTik Router

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mozerd
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Fri Aug 02, 2019 1:52 pm

6.45.3

*) rb4011 - fixed SFP+ interface linking (introduced in v6.45.2);
Very strange that no official announcement on the Forum and when using Winbox "Check for updates" only 6.45.2 displays.
 
posh4529
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Fri Aug 02, 2019 2:50 pm

I prefer to stay on 6.45.1 until Mikrotik team stops this storm of bugs and lets the community know we can safely update avoiding significant issues. Otherwise will have to think twice if it's worth using Mikrotik hardware once you may quite unexpectedly get a swarm of bugs and issues.
 
stuartkoh
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Sat Aug 10, 2019 9:00 pm

I prefer to stay on 6.45.1 until Mikrotik team stops this storm of bugs and lets the community know we can safely update avoiding significant issues. Otherwise will have to think twice if it's worth using Mikrotik hardware once you may quite unexpectedly get a swarm of bugs and issues.
They do warn you to stick with "longterm" for mission critical installations.

https://wiki.mikrotik.com/wiki/Manual:U ... ase_chains

Each user has to decide for him or herself what they value most. If you value stability and lack of bugs, then "longterm" is probably your best bet.

I like the fact that I get a choice of which release chain to use. There are other vendors where you don't get a choice.
 
mare92
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Mon Sep 02, 2019 8:23 pm

I had the same issue with SFP completely stopped working, there was no traffic, nothing helped so I updated to beta FW.
But the problem repeated on 6.46beta38, so I downgraded to 6.45.5 and it’s up again.
It is definetely a problem with RouterOS and I can replicate it.
Last edited by mare92 on Tue Sep 10, 2019 2:13 pm, edited 1 time in total.
 
posh4529
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Tue Sep 03, 2019 12:05 pm

I have downgraded to RouterOS 6.44.5 and can state the stable functionality of the RB4011. Now I'm a bit puzzled when and whether it's a good idea to upgrade to any later release. The point is that all releases beginning with 6.45.* have different issues causing malfunctions of either SFP+ interface or WiFi interfaces.
It's a pitty that MikroTik keeps silence as though the problem doesn't exist.
 
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mozerd
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Re: A serious issue on RB4011 after upgrade to RouterOS version 6.45.2

Mon Sep 09, 2019 5:24 pm

6.45.3

*) rb4011 - fixed SFP+ interface linking (introduced in v6.45.2);
Fixed? I do not believe its fixed based on the experience in the Following thread"
MikroTik RB4011 SFP+ GPON

How disappointing and unprofessional!

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