We always lean towards optics first because it's easy to test. We've seen packet loss with no errors with a crappy SFP from FS.
On Thu, Jul 2, 2020 at 8:53 AM Adam Moffett <dmmoff...@gmail.com> wrote: > So for the packet loss with no obvious cause, do I blame the cheap > optics or the cheap switch? Sounds like we're thinking switch. > > The most recent issue (which prompted these questions) was 1/10th second > of packet loss every 2 seconds. It was between two CRS 2xx switches > with $10 Fiberstore SFP's. I feel like one end or the other should have > been accumulating thousands of errors, but nope. No errors; nothing to > see here. And btw Rx power was around -12 on each end vs a sensitivity > of -23. OTDR trace showed nothing weird. > > On 7/2/2020 11:30 AM, Trey Scarborough wrote: > > The switch/router should report the error. The SFP is just a blinky > > light for the most part, until you get into 100g coherent optics. Some > > things that may not report errors would be interface drops, but would > > be reported as a link down. I would really like it if mikrotik would > > implement a hold time/ port flap protection. Also reading more SFP > > detail would be nice so it would now alarm levels for the RX signal. > > > > On 7/1/2020 10:53 AM, Adam Moffett wrote: > >> n something is clearly wrong, why aren't errors reported? Is it: > >> 1) Mikrotik interfaces never report errors to begin with? > >> > >> 2) My cheapo SFP's don't report an error to the host switch/router? > >> > >> 3) An error at the SFP is invisible to the host switch/router? > >> > >> > >> ......and I'm not talking about optical problems because those are > >> detectable with an OTDR pretty much 100% of the time. Talking > >> specifically about issues with switches and SFP's. > > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
-- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
