@cmr - We're running MS355's on the edge, and Cisco 9500-16 as the core. The 355's are stacked. We moved equipment off the 355's and were able to communicate. When we rolled back, everything started functioning normally. We're going to stay at this release until this bug is addressed.   ... View more

We moved to this version and it broke multicast for my PA/CLOCK system. It broke it so bad the server that hangs off a Meraki switch could not talk via multicast to the speakers that were on the same switch. As soon as I rolled back to 14.38.1, the entire system came back up. Sounds like there are bugs in 15.20. Be careful.  ... View more