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Non-Cisco SFP in a Cisco small biz switch?

2021-08-28 by: David White
From: David White 
Anyone know if you can get a Dell SFP-10G-SR optic to work in a Cisco Small
Business switch for 10G connectivity?

I have one of the new Cisco Small Business switches (CBS350), and it has 4x
10GB sfp+ ports.

In the web UI, I see this in the logs:
%NSFP-I-SFPGibicDetected: te1/0/1 SFP port is present, module type - 10G

I SSH'd to the switch, and tried the hidden comments, but I'm wondering if
Cisco just doesn't support those commands in the small biz series? I don't
know. I've only heard about the hidden command to enable non-Cisco optics,
I've never actually used it before.

switchaf1971(config)#service unsupported-transceiver
% Unrecognized command

switchaf1971(config)#errdisable detect cause gbic-invalid
% Unrecognized command

I tried running those commands on the actual interface as well, and got
similar unhelpful results:

switchaf1971(config-if)#service unsupported-transceiver
% Ambiguous command

switchaf1971(config-if)#errdisable detect cause gbic-invalid
% Unrecognized command

Any ideas? Or do I need to bite the bullet and buy an official Cisco optic?

David White

=============================================================== From: Ben Bryan ------------------------------------------------------ The SG350 use IOS "light." It's not the usual full Cisco IOS commands work. There should be a cli guide somewhere for the SG350 series switches. This might be it: https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/350xg/cli_guide/CLI_Tesla_SG350X_SG350XG_2_2_5.pdf I searched some of your commands and they aren't in that pdf. Not sure if this is relevant but I know the previous generation (SG-300 series) I had no trouble using unsupported optics. I never had to input a special command to use unsupported optics.  I did have some issues using 100Mb BIDI optics which are super odd-duck but that's about it. Things to consider. Are both optics 10G Base-SR? If you have more than one fiber jumper in use you might need to "roll" the tx/rx fibers to get a link. If you have SFPs that support DDMI you can do "show fiber-ports optical-transceiver interface X"    Port      Temp  Voltage Current Output  Input   LOS              [C]   [Volt]  [mA]    Power   Power                                    [mWatt] [mWatt] ----------- ------ ------- ------- ------- ------- ---     gi1       0      0.0     0.0    1.00    1.00   No That will tell you if you are receiving light from the other end. I bought off brand optics from fs.com and _never_ had compatibility issues with the Cisco SG-300s.  Hope that helps. Hit me up tomorrow if you are stuck. Ben

=============================================================== From: David White ------------------------------------------------------ I'm guessing my problem is on the other side, as I was hoping to test a Ubiquiti 10G-Base SR (SFP+) in a Ubiquiti EdgeRouter that only has SFP. But I'm reading that won't work.. I don't have any spare 1Gb optics, but this was only for a test scenario anyway. My prod environment is 10Gb to 10Gb. Worst case, I have copper on the server that needs the connectivity too, and I can just re-IP the server interface in question when I go to make the changes I'm planning on in the next few weeks. -- David White

=============================================================== From: Dave Brockman ------------------------------------------------------ *chuckle* No, that won't work :) I can't speak specifically to the CBS models, but their previous generation counterparts had no issues with whatever optics you threw at them. If they passed light, the SG3[0|50[X][G] and 5xx series counterparts will light them. They also do not have a setting for unsupported transceivers, nor automatic errRecovery options for unsupported-transceivers. Cheers, -Dave o cli_guide/CLI_Tesla_SG350X_SG350XG_2_2_5.pdf id Current Output=C2=A0 Input=C2=A0=C2=A0 LOS =A0 [C]=C2=A0=C2=A0 [Volt]=C2=A0 [mA]=C2=A0=C2=A0=C2=A0 Power=C2=A0=C2=A0= Power=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [mWatt] [mWa= tt]=C2=A0=C2=A0=C2=A0=C2=A0 =A0=C2=A0=C2=A0=C2=A0 0.0=C2=A0=C2=A0=C2=A0=C2=A0 0.0=C2=A0=C2=A0=C2=A0 1= .00=C2=A0=C2=A0=C2=A0 1.00=C2=A0=C2=A0 No=C2=A0 Hit

=============================================================== From: Sudo Bash ------------------------------------------------------ Just buy some supported ones, but in case you're interested: https://hackaday.io/project/21725-pihat-sfp-encoder https://www.fs.com/products/75866.html https://sfptotal.io https://www.google.com/amp/s/m.made-in-china.com/amp/product/SFP-Qsfp-XFP-Optical-Module-Codingbox-PCB-Encoder-747243252.html

=============================================================== From: Dave Brockman ------------------------------------------------------ LOL, unless you deal with massive quantities, just buy them from fs.com. With Gratitude, Dave Brockman Chief Backup Officer Gig City Cloud, LLC FP-Optical-Module-Codingbox-PCB-Encoder-747243252.html t - o

=============================================================== From: Stephen Kraus ------------------------------------------------------ You can get compatible ones from Amazon, I've purchased a few without issue, but you gotta be specific and ensure you are buying a model with known Cisco compatibility.

=============================================================== From: David White ------------------------------------------------------ Yeah, that's what I figured. Thanks. I've decided to go with DC Blox, and I hope to start moving equipment in the next week or two. I got a tour of their datacenter last week. Pretty nice in there. It'll be more than I'm paying now, but I think it'll be worth it in the long run, especially since I have a half rack to grow into and only need 7U right now. -- David White