Cheap? Mikrotik.
A Mellanox SNxxxx would likely be the best performance/$ option, depending upon how many ports you need, though. See the tips ‘n tricks thread for more on those.
Arista is my personal favorite, but they’re more power hungry (assuming that matters to you).
The appropriate way to say that is along the lines of: “as of MFT version XYZ, mst start is no longer necessary.”
I provided the environment details to avoid exactly that sort of future visitor sharpshooting BS.
QSFP (quad) to SFP is purely passive and mechanical: a four lane signaling interface is reduced to a single lane. There’s nothing complicated about it. SFP to RJ45 is an active conversion, but the source of the single lane is irrelevant.
Assuming there isn’t any transceiver vendor ID...
No, the TCAM with the internet FlexRoute policy can store up to 1.2M IPv4 prefixes on the original 7280R.
ETA: Here’s one source for that number Arista Community
ETA The Second: You’re not wrong about the lifetime of this hardware, though. There’s a reason it‘s available at the price it is.
That's going to depend on how well FlexRoute works with your peering relationships, but with a 32 bit image (don't use 64 bit EOS on an 8GB 7280R!) 2-3 tables from distinct neighbors is within the realm of possibility.
These platforms are cheap because 1) 10GBASE-T is going the way of the Dodo...
That does seem high. Here's a machine I have sitting here in my office with a H12SSL-i and 7B13 in it:
nvme-pci-0100
Adapter: PCI adapter
Composite: +37.9°C (low = -20.1°C, high = +89.8°C)
(crit = +94.8°C)
k10temp-pci-00c3
Adapter: PCI adapter
Tctl: +33.0°C...
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