7
Latency of 10GBASE-SR/-LR vs SFP+ DAC is very closely the same - in contrast to 10GBASE-T which adds appr. 1.5 μs.
Majorly, latency is caused by the line encoding overhead. In the case of -R PHYs, that's 64b66b code which requires little processing. SFP+ cages are directly fed with an -R data stream, which DACs then couple onto copper twinax and SFP+ ...
2
You can do basically anything that can be done from the GUI via either API calls or the NXOS CLI. Take a look at the various show commands here to get started. There's also a hyperlink to an index with every available CLI command.
2
You need to remember that ping is bidirectional. You send out an ICMP echo request, and you hope to get back an ICMP echo reply. That means that the replying device must also have a route back to the original sender.
You did not include the R3 routing table, but it would seem that R3 does not have a route back to the source of the ICMP echo request. It is ...
1
Neither of your switches has a layer-3 interface configured, and only one even has a gateway configured. Without an address, your switches cannot participate in any network layers above layer-2.
Switching happens at layer-2, and unmanaged switches cannot ping or be pinged. A managed switch with a configured management interface (and gateway to be able to ...
1
I think this is something on what you can't affect from your side. I suppose the best option will be to create a support ticket with a feature request. But there is a really small chance that Cisco will do something with it. I have multiple examples when more problematic cases were marked as "wont-fix".
I have this output by the way:
# show version
Role ...
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