I am back with a different issue I need more intelligent people than myself for.
Hardware:
Router: Mikrotik CCR2004-16G-12S+ with ROS 7.15
GPON: Zyxel PMG3000-D20B
Since I have switched to the Zyxel GPON I am having spontaneous link down and ups on the SFP interface. The GPON stays up (uptime is more than 3 days during which I had ~40 disconnects).
With the ISP-provided modem, the connection was rock solid, as such it seems highly likely that it is indeed the GPON that is at fault.
The only thing that sticks out here is the following which can be found in the dmesg of the GPON:
...
[321234.652000] ERO
[321249.656000] ERO
[321281.656000] ETU
[321281.656000] ERO
[321481.660000] ERO
[322132.656000] ERO
[322224.656000] ETU
[322224.656000] ERO
[322345.648000] ERO
[322346.656000] ETU
[322790.656000] ETU
[322790.656000] ERO
[323055.652000] ETU
[323055.652000] ERO
[323056.656000] ETU
[323288.656000] ERO
[323486.652000] ERO
[323793.652000] ETU
[323793.652000] ERO
[324011.656000] ERO
[324178.652000] ERO
[324200.660000] ERO
[324304.660000] ERO
[324388.652000] ERO
[324450.648000] ETU
[324450.648000] ERO
I can only help for the Italian language issue, but it is - I believe - about a different problem, a certain Italian ISP provides a Zyxel router that is somehow mis-configured and doesn’t reach the expected upload speed.
It is a peculiar case where the contract is about up to 2.5 Gb in download (but the actual infrastructure - exception made for a few rare cases/locations - tops anyway at 1 Gb in download) and 0.5 Gb in upload, but the upload is capped (by a bug in the firmware/software) to 0.2 Gb or less.
The thread is about downgrading (with the risk of bricking the router) to an earlier release that is capped to 1.0 Gb in download, but allows 0.5 Gb in upload.
Nothing to do with frequent disconnections.
This said, it is rather common that various manufacturers SFP’s have compatibility issues with Mikrotiks, but the particular model you have (PMG3000-D20B) seems to be working fine for other members, at least on other Mikrotik hardware: http://forum.mikrotik.com/t/help-with-zyxel-sfp-gpon-module/175838/1
Yes, but on that thread, once the MTU/fasttrack issue was solved, the OP was happy with the device connected to his Hex S, this should mean that there is not a “generic” incompatibility issue between Mikrotik and that Zyxel SFP, which leaves us with:
a specific incompatibility between your CCR2004-16G-12S+ and the Zyxel PMG3000-D20B (possible but IMHO improbable)
something in the firmware or settings of the Zyxel PMG3000-D20B (what you are suspecting, most probable)
something in your Router OS settings (less probable, still possible)
For #2, I don’t think you will find many people with Zyxel experience here.
For #3, if you post your configuration, following these instructions: http://forum.mikrotik.com/t/forum-rules/173010/1
some of the more experienced members may be able to review it and possibly spot something that might be involved, or however give you some instructions on how/what to log on the Mikrotik side.
I’ll check out if I find reason for the case that the MTU is the issue. Thanks for the additional pointers. After work I will invest some mote time into this topic.
So I don’t know if I am wrong but my research says that my ISP doesn’t support an MTU/MRU of 1500 for PPPoE and still wants to have 1492 as an MTU set. If I understood you right the MTU of 1500 should be set on my physical interface. You can see both the physical interface and the tagged VLAN is at an MTU of 1500. So I should be good? Or are you referring to the actual PPPoE interface which is at 1492 but my understanding is that I can’t change that myself?
I face the same issue with the zyxel module and a rb5009 (provider is deutsche telekom). Did the FS GPON-ONU-34-20BI work without port flapping? Would you recommend it?
Yes I can fully recommend it. The only issue was getting the device ID which is only visible after logging into the GPON. This however was straightforward after checking the manual. Sorry for not confirming this earlier.
I made a support ticket at Mikrotik for the issues I had with my Telekom PMG3000. They let me know that the Zyxel SFP is not built to the SFP-MSA, and that pin 6 is not properly grounded like it is supposed tho.
The Zyxel also works fine in my Mikrotik RB260Gs switch, but i have random disconnects in my L009. Same module!
Am now also looking at a replacement module, and I want to contact telekom if they are aware that this SFP is not MSA-compliant. I hope they are willing on working to resolve this issue…
Possibly also getting the FS SFP. Did you just change the GPON S/N to the one of your Zyxel and it is now working? or did you contact telekom to have the FS ONT registered in their system/olt?
I have the RB5009UG+S+IN and the same issues with the Zyxel SFP. I got the FS.com one, but I can’t set the S/N, because the Zyxel has a 13 char S/N and a 16 char modem id (and I used the modem id to register it) and the FScom one has a 12 char serial number thats shown with onu gtcsng and a 11 char serial thats completly different thats printed on top and I can’t set a serial larger than 12 chars… I’ll try registering the FScom one with the 12 char onu serial with telekom the next days, hopefully that works…
Edit: just called telekom, switch was easy, they just need the serial from the “onu gtcsng” command and they activate the new modem. the S/N must be either 12 or 16 chars long.
