nanog mailing list archives
Re: Juniper hardware recommendation
From: Sander Steffann <sander () steffann nl>
Date: Sun, 16 May 2021 23:22:32 +0200
Hi! 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? Cheers, Sander
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Current thread:
- Re: Juniper hardware recommendation, (continued)
- Re: Juniper hardware recommendation Baldur Norddahl (May 10)
- RE: Juniper hardware recommendation Michael Fiumano (May 14)
- RE: Juniper hardware recommendation Adam Thompson (May 14)
- Re: Juniper hardware recommendation Jason Healy (May 16)
- Re: Juniper hardware recommendation Colton Conor (May 16)
- Re: Juniper hardware recommendation Mark Tinka (May 16)
- Re: Juniper hardware recommendation Jon Lewis (May 16)
- RE: Juniper hardware recommendation Adam Thompson (May 14)
- Re: Juniper hardware recommendation Saku Ytti (May 15)
- Re: Juniper hardware recommendation Mark Tinka (May 15)
- Re: Juniper hardware recommendation Saku Ytti (May 15)
- Re: Juniper hardware recommendation Sander Steffann (May 16)
- Re: Juniper hardware recommendation Saku Ytti (May 17)
- RE: Juniper hardware recommendation Jean St-Laurent via NANOG (May 17)