They don't even need to be MethodE, that string just needs to appear
there as vendor. I think there is some part of code which uses that
vendor string to discriminate how the CuSFP does link-state.

CuSFP is notoriously difficult compared to opticals.

On 5 April 2018 at 02:59, Daniel Roesen <> wrote:
> On Wed, Apr 04, 2018 at 11:59:31AM -0500, Chris Adams wrote:
>> Has anyone tried a copper SFP in an MX204?  With 18.1R1, the ports can
>> be set to 1G mode, and I can use a fiber SFP, but a copper SFP doesn't
>> work for me.  The router sees it, but the port shows "up" (even with no
>> wire connected), and it won't actually pass any traffic when connected
>> (both ends see transmits but 0 receives).
> I've seen this with Finisar Copper-SFPs in 20x1G MICs which worked fine
> in 40x1G DPCs. Swapping them out with Methode Elec. SFPs did the trick.
> I remember that there were basically two different ways to signal
> link status from SFP to host, and the Finisars didn't do it the way the
> newer MX hardware expected it.
> Best regards,
> Daniel
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