> On Dec 7, 2018, at 10:19 AM, Theo Voss <[email protected]> wrote: > > Hi all, > > we’re experiencing a strange issue on MPC7, configured for 2x40G 4x100G. On > two different routers, two different QSFP28 (not same PIC/Port) ports on MPC7 > do not recognize the inserted 100G LR4 transceiver while showing I2C errors. > We’ve already exchanged the transceiver and verified that the transceivers > are OK. Next step is a PIC and FPC reboot, then JTAC case. Just wanted to > check if someone has seen an identical issue? >
I don’t know the electrical design of the MPC7 but ideally you want either to be doing a bitbang i2c or be going via an i2c mux. I’ve seen issues with cheaper optics and not handling the higher i2c rates, eg: over 100. You start to see errors when asking them to respond. I ask my vendors to make sure they’re implementing reading of all the SFF reading relevant for the optic families that we use. Make sure you ask and specify a revision number, eg: version 12.2 of the document, or sff-8690 if your hardware needs that. - Jared _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
