I'm designing a metro fiber ring (1000 mbps) that will have a 9-10 hop diameter. IEEE says no more than 7 hops, but a colleague says that was recommended with 10 mbps links in mind. Any thoughts on STP failing if I have the extra hops on the gig ring? I'm using rapid spanning tree now with default timers. The ring isn't complete yet, but an average rt ping is under 10ms from end to end and shouldn't increase much based on the number of hops left to install and distance to cover. I don't want to redesign this if the gig links will handle the current setup. Any insight, suggestions, best practices is greatly appreciated.