On 14/09/2015 23:15, Crist J. Clark wrote: > I am not exactly sure of the design decisions behind the choice to use LRM > over > SMF to orginally connect the distro to the core when the campus was built. But > given that it was working, and we already had almost enough spare LRMs on hand > to complete the project, It Seemed Like a Good Idea at the Time.
Right. :-( > We also have OM3 MMF between the buildings so replacing this all with SR is > the main plan right now, but whatever the problem is with the LRM modules > looks more like software/firmware than a problem with the fiber paths (the > links > always do eventually come up with good light readings and no errors), and we > were just curious if anyone had seen this issue with 5ks and LRM before and > found a way to deal with it. LRM transceivers are a bit of a curiosity tbh. I've never seen anyone using them in production. Because they're uncommon, this has the consequence that they will not be well debugged. In many situation this is not a problem, but if you have dispersion problems, it can be, because dispersion compensation on 10G SFPs is handled on the switch / router motherboard. I.e. this can easily be a software problem. Also, if you're using LRM out of spec (SMF cabling instead of MMF), you should probably expect problems. LR SFPs are cheap: ~$100 each for transceivers from reputable third parties. You will save yourself time, money and heartache by sticking with LR over SMF for longer runs and not using MMF Nick _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
