I don't know the limitations of your Netgear smart switches, but the last time I had to deal with unicast packet storms was:
- someone creating an actual loop - single massive VLAN with dozens of subnets in it that fouled up Spanning Port (basically, addresses would age-very quickly because the table was so big, and nothing had been tuned). If you don't have a sniffer, or a Fluke or any other diagnostic information, then if you think it could be a loop, disable redundant switch uplinks, and re-enable them until the problem comes back. Mike On Mon, Jul 11, 2016 at 5:34 PM, Gilbert Wilson <gilb...@watchhouse.org> wrote: > Last week our network was intermittently brought to it’s knees for short > periods of time because of what appeared to be unicast packet storms. What > we experienced looked almost exactly like this: > > https://supportforums.cisco.com/discussion/12395006/packet-storm-c3750x > > Another person who saw the same thing pinpointed it to faulty Apple > Thunderbolt Displays (which we do have plenty of on our network): > > https://discussions.apple.com/thread/6443650?start=0&tstart=0 > > I’ve tried to search for the garbage hardware addresses in our switch > address tables, but the results come up blank. I don’t know why it comes up > blank, but assume it has something to do with the nature/character of the > packet storm to begin with. For instance, I *think* I read somewhere a long > time ago that Netgear Smart switches will devolve to dumb hubs if they are > spammed with too many hardware addresses in a short period of time. If > that’s the case, I could see that contributing to the problem. > > Given the limitations of my Netgear Smart Switches what other tools and > techniques would you use to try to track down the source of this kind of > traffic? Any pointers are most appreciated! > > Gil > _______________________________________________ > Tech mailing list > Tech@lists.lopsa.org > https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech > This list provided by the League of Professional System Administrators > http://lopsa.org/ >
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