Multiple unicast routing table support

[mnxx]

Hi,

I am testing a policy-based unicast routing scheme which generates a different routing table for each policy. Is there currently any possibility to choose a specific unicast table to use with pimd?

Thank you in advance!

[troglobit]

Hi! There's nothing today, although most multicast routing is concerned with reverse-path filtering (RPF) it's often centered around the source IP of the sender, and how to reach that (to make multicast routing decisions). So it's well suited for at least source routing.

Just by googling a bit I found https://olegkutkov.me/2019/03/24/getting-linux-routing-table-using-netlink/ which discusses how to look up the correct table. So modifying src/netlink.c shouldn't be too much work. Only issue is how this should be configured, and here I'd have a look at cisco/juniper/procurve and also FRR to see what they've done.

[mnxx]

Thanks, the provided link is quite insightful!