Juniper hardware recommendation

Sander Steffann sander at
Sun May 16 21:22:32 UTC 2021


On Sat, 2021-05-15 at 11:38 +0300, Saku Ytti wrote:
> Juniper has worked like this since day1 and shockingly the world
> doesn't care, people really don't care for accuracy. CLI and SNMP are
> both L3. If you want to report L2 'set chassis fpc N pic N
> account-layer2-overhead'.
> However, who decided that L2 is right? To me only L1 is right, I
> don't care about L2 at all. So any system I'd use, I'd normalise the
> data to L1.
> Ethernet on minimum size packets
> L1 - 100%
> L2 -  76%
> L3 -  24%
> Not sure why 76 is better than 24. Both are wrong and will cause
> operational confusion because people think the link is not congested.
> This is extremely poorly understood even by professionals, so poorly
> that people regularly think you can't get 100% utilisation, because
> you can't unless you normalise stats to L1 rate.

How do you normalise? Use L2 or L3 octets stats, and use the number of
packets to calculate the L2 and/or L1 overhead the stats are missing?
Or do you have a better way?


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