Question about connecting SFP module to BPI-R3

Banana Pi Router design BPI-R3/R3 Mini(MT7986)
1

Hi, I’m waiting now for my SFP module. I want to replace my ISP’s ONU with it. And I have one small question about it.

Obviously, I know, that I must copy all settings from ISP’s ONU to SFP stick (serial number, ploam password etc).

But how can I make SFP module visible to me? As I understand, I must change router’s ip to something different, than 192.168.1.1 first (it is default lan ip of sfp stick). But how should I proceed after that?

Now I have br-wan bridge device with sfp1 and wan devices bridged. I think, it is default setting. I changed only mac of br-wan device, because my ISP authorizes my router via mac address. After changing default mac of br-wan device, br-wan interface receives ip from my ISP and I have connection to the internet.

Should I add new interface with single eth1 device and give to this interface 192.168.1.2 ip address?

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Anyone can share a working config for this? Currently I have internet connection via DHCP, no pppoe or something like that.

I just can’t understand, how I can reach SFP module web interface.

Or should I temporarily delete eth1 from br-wan, add eth1 to br-lan, change all necessary settings on SFP module, than delete eth1 from br-lan and add it back to br-wan?

I think it will work than, but I think, that I will not have any access to SFP module interface anymore. Right?

3

Sfps have no webservice or own ip address. Sfp is only a media converter (copper-copper or fibre-fibre). Sfp cannot hold an ip and are connected by i2c bus.

You can access the sfp via "ethtool -m " or by using i2c tools (low level access). If sfp is found or not you can also see in bootlog/dmesg

4

But how do some guys enter this web interface of SFP module? Picture

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I guess the webinterface is hosted on parent device (Your old router/ont - you have to start your own on r3) and read out information from the sfp.

6

Some SFPs have ssh/web interface, like MA5671A You can access it on LAN by creating a new interface https://openwrt.org/docs/guide-user/network/wan/access.modem.through.nat

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Thank you, it is very helpful. My module has web interface.

8

That’s true and false at the same time:

The “SFP” is a form factor, that does the signal adaptation + a few i2c commands for monitoring.

But in the specific case of more advanced technologies like *PON (GPON, XPon, …) but at the time I’ve also seen VDSL2 SFPs , the makes added a FULL linux OS (often based on OpenWRT…) within the metal case of the SFP itself. (This leads to all kind of various issues : the power supply needs to provide enough current for example, but also the i2c bus & the control lines like TX_Fault, Tx_Disable, RX_LOS , RS0 & RS1 are emulated by the OS within the SFP… with sometime “questionable” behavior)

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were you able to use plugin in the ODI PON SFP device in the SFP1 port and connect to internet without the ISP’s box? when I plug in my XGS-PON device into the SFP1 port, nothing happens, even if the fiber cable is connected to the XGS-PON device: br-wan does not receive any IP address. In port status in luci, eth1 still shows as 0B up/down. When I use an external media converter and plug then plugin to the wan ethernet port, everything works fine. There is an issue about it but closed with solution.