Brian E Carpenter <brian.e.carpen...@gmail.com> wrote:
> 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.
It seems like a bad way to go open-loop.
> Since we need the autonomic mechanisms to work well in times of
> overload, this effect needs to be understood by implementors.
Given an ACP, the L2 devices should only see unicast ESP packets.
--
Michael Richardson <mcr+i...@sandelman.ca>, Sandelman Software Works
-= IPv6 IoT consulting =-
signature.asc
Description: PGP signature
_______________________________________________ Anima mailing list Anima@ietf.org https://www.ietf.org/mailman/listinfo/anima
