Has the group considered a Bier model for multicast in the home?
On 2/20/15, 9:41 AM, "Toerless Eckert" <[email protected]> wrote: >I have seen more L2 switches that have broken IGMP/MLD snooping than >working ones. I am not aware of real proliferation of PIM snooping. >Snooping in transit LANs with PIM is a bad idea anyhow, and i have >tried to steer any customer who asked me away from it. > >Bidir-PIM makes snooping particularily difficult. For once >you have to track DF-winner election messages (difficult) and >secondly you have to then flood all multicast to all DF winners >because you don't know which group-range is served by which RP. > >IMHO, there is never enough multicast to justify this snooping complexity. >The only thing to worry about is what packets to send out from a router >to ensure the snooping doesn't screw up the traffic flow. > >I would be surprised to find equipemnt that does PIM snooping by default. > >So, i'd recommend to a homenet router: > >-> even if you don't do PIM, send out PIM Hellos. This should > effectively make all stupid "enterprise class" IGMP/MLD snooping > switches (that often have broken IGMP/MLD snooping) send > you all multicast traffic (inhibits snooping). > >-> Still send MLD/IGMP memberships to get traffic through the > L2 home equipment that has likely never heard about PIM. > I'd guess that eg: powerline equipment falls into this > category. > >Cheers > Toerless > >On Fri, Feb 20, 2015 at 11:04:41AM +1100, Andrew Mcgregor wrote: >> Why? PIM and MLD snooping are pretty standard on very low-end >>enterprise >> switches, which will be next year's midrange consumer models. If the >> dumb-as-rocks stuff goes away, that would generally make people happier. >> >> On 20 February 2015 at 05:22, Mikael Abrahamsson <[email protected]> >>wrote: >> >> > On Thu, 19 Feb 2015, Ted Lemon wrote: >> > >> > On Feb 19, 2015, at 1:08 PM, Mikael Abrahamsson <[email protected]> >>wrote: >> >> >> >>> I would like my router-to-router links to not have a lot of hosts in >> >>> them if I can avoid it. >> >>> >> >> >> >> Why is that? >> >> >> > >> > If we're going to be routing multicast within the home, we're most >>likely >> > going to have to use some kind of variant of PIM. Asking the L2 >>switches >> > people connect to the router to support both PIM and MLD snooping >>seem like >> > it might be asking too much. >> > >> > I might be wrong though. >> > >> > -- >> > Mikael Abrahamsson email: [email protected] >> > >> > _______________________________________________ >> > homenet mailing list >> > [email protected] >> > https://www.ietf.org/mailman/listinfo/homenet >> > >> >> >> >> -- >> Andrew McGregor | SRE | [email protected] | +61 4 1071 2221 > >> _______________________________________________ >> homenet mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/homenet > > >-- >--- >Toerless Eckert, [email protected] > >_______________________________________________ >homenet mailing list >[email protected] >https://www.ietf.org/mailman/listinfo/homenet > _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
