One more thing from our tests this week. We noticed when testing at busy times that link-local multicasts were often dropped. We would see quite long gaps when discovery and flooding simply did not occur. Suspecting that the wireless network was limiting the rate of multicasts, I cheated for a few minutes by sending multicasts 10 times more frequently, and the gaps in performance vanished.
According to the NOC: > > Do the access points throttle the rate of IPv6 link-local multicasts? > Yes, we do MLD snooping on our wireless LAN controllers to prevent > multicast storms over the air. The MLD timeout and MLD query interval are > set to 60 seconds and 20 seconds, respectively. So, on a busy network the effect of that is apparently to incent a protocol like GRASP to increase its rate of LL multicasts to grab a sufficient share of capacity. Since we need the autonomic mechanisms to work well in times of overload, this effect needs to be understood by implementors. Regards Brian _______________________________________________ Anima mailing list Anima@ietf.org https://www.ietf.org/mailman/listinfo/anima
