Hi Luke, Just to be my annoying self -- this is the kind of thing that it would be great to have a short memo about. The steps aren't complicated, but you do have to get everything right at the switch / receive-side for things to work.
Speaking to your original question -- the latest ROACH2 library (roach2 branch of mlib_devel) supports multicast sending (and receiving, though I've never used that). I believe I've used multicast tx on an Arista 7050QX-32 switch and a Mellanox SX1012 to good effect. Needless to say, I didn't write the above memo which I'm gently suggesting you do. :) Good luck! Jack On Mon, 28 Jan 2019 at 09:36, David MacMahon <[email protected]> wrote: > > Hi, Luke, > > I have not used a ROACH2 to send multicast packets, but the MeerKAT folks > certainly have. My understanding is that the 10 GbE block does the proper > mapping of multicast destination IP address to multicast destination MAC > address so it should "just work". > > I recommend starting with a direct connection between a ROACH2 and a PC. > That way the PC's NIC will get the packets without having to interact with an > intervening switch. That will let you examine the packets using tcpdump or > wireshark. To get the kernel to pass the multicast packets up the network > stack, I think you will still need to use the IP_ADD_MEMBERSHIP socket option > (see "man 7 ip" for details). When you have that working, then you can add a > switch into the path. The IP_ADD_MEMBERSHIP option will inform the switch > (via IGMP) of the multicast group (i.e. address) that you wish to receive > packets for. > > HTH, > Dave > > > On Jan 28, 2019, at 08:08, Luke Hawkins <[email protected]> wrote: > > > > CASPERites, > > > > Has anybody been using ROACH2s to transmit multicast packets? > > > > I found the following two threads on the mailing archive, and was > > wondering if the 10GbE blocks had been updated since then in ways that > > could impact multicasting, or if anybody had any comments on preferred > > IGMP snooping switches, etc... > > > > https://www.mail-archive.com/[email protected]/msg06132.html > > https://www.mail-archive.com/[email protected]/msg04527.html > > > > -Luke Hawkins > > > > -- > > You received this message because you are subscribed to the Google Groups > > "[email protected]" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > -- > You received this message because you are subscribed to the Google Groups > "[email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected].
