On our campus, we have a pair of Nexus 5596 cores connected to 5548s at the distro layer using SFP-10G-LRM optics. We ran into some of the layer 3 limitations inherent in the 5596s and are moving to a Catalyst 6880X core. To be safe, we just copied the existing design and put in SFP-10G-LRM optics to link the 6880 to the 5548s. It did not go well.
The links flap at the 5548 side and eventually drop into the "linkFlapErrDisabled" state... most of the time. Given enough retries, minutes or hours later, they all seem to eventually come up. And once they come up, they look OK. Before we started, we verified the SFP-10G-LRM was supported on 6880s. After a lot of troubleshooting, we eventually realized that the optics are NOT listed as supported for 5548s or 5596s. That is despite the fact we've been running our campus on that for the last three years. We're obviously looking at getting new optics, but we're wondering why what we have works and if it still isn't possible to get the Nexus 5548 and Cat 6880X links to behave better. We're working with TAC and our Cisco reps, but wonder if other customers have experience with 5000s and SFP-10G-LRM modules. -- Crist J. Clark _______________________________________________ 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/