Comment Re:Not a 486 thing, but... (Score 1) 125
I also like the idea that if you stick a copper SFP into modern "merchant silicon" switch (Broadcom Jericho), you may or may not get working autonegotiation. And copper devices like to have that on by default, even if it's technically not needed for Gigabit Ethernet. And then there might be half-assed support where support for autonego is only for clause 37, but not clause 73 (or vice versa, don't remember which. Anyway, it meant that hooking up a Juniper SRX to a Cisco NCS 57C3 (or anything else using Jericho 2) does not work if autonegotiation is on...)
Then there's the whole thing that if you use copper SFP, even if the SFP itself would support it, the switch doesn't like downgrading to 10 or 100 Mbps.
Of course, complaining about the fact that 10/100Mbps or autonego does not work sounds odd when on the same device you can stick a QSFP and 400G optics, but if you'd prefer to have a single 1U that could handle everything it would be nice to have maximum compatibility... Because now we have to stick another unit into the rack to handle "legacy connectivity", usually just some IPMI or similar stuff.