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darrin

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darrin
·9 माह पहले·discuss
The L1 path can't do any address matching and you can't overlap sources - like Ghostbusters, no crossing the streams. You can source port 1 to ports 2-4 (multicast, but static and unidirectional) and you can change a bidir connection between pairs of ports. The signal gets replicated regardless of what's in the frame. It wouldn't be practical to make it behave quite like an L2 switch.
darrin
·9 माह पहले·discuss
They're more like digital patch panels. You can connect any pair of ports together in both directions (TX/RX), just like moving a patch cable around. You can also connect an incoming RX lane to multiple TX lanes (think optical splitter but electrical). You cannot merge signals together. Some products have FPGAs that add L2+ or multiplexing functionality with packet buffers, but that's not part of the 2-5ns path.
darrin
·9 माह पहले·discuss
There are L1 crosspoint "switches" in the 2-5ns range depending on port density and similar modes in some Ethernet silicon. These are not Ethernet switches in any normal sense though. They only replicate the signal 1:1 or 1:n and do not dynamically switch the destination based on anything in the packet. The fastest L3 Ethernet switches on the market are ~90ns.
darrin
·पिछला वर्ष·discuss
When I was at a small IT consulting shop ~15 years ago, this is roughly how it worked. We'd get paid 24x7 for a week on-call at minimum wage + 1.5x normal wage for any hours we had to log in.