On Fri, Sep 01, 2017 at 11:36:01AM +0200, Ondrej Zajicek wrote:
Starting from kernel 4.11 (commit beb1afac518d), IPv6 are now notified using RTA_MULTIPATH, like IPv4 routes. Those routes are not handled correctly by BIRD. We handle them correctly. This also enable to parse alien routes correctly. Route modifications is still done in the old way as for insertion/deletion, this is not helpful to optimize in those cases and for replace, IPv4 case is not optimized either. It should be possible to detect appropriate support for RTA_MULTIPATH when receiving an IPv6 route with this attribute, but I don't see how it would be helpful, so I didn't do it (simpler code this way).
Hi
Thanks for the patch, it looks OK. I will try it and merge it.
We plan to simplify the multipath processing code in 2.x branch so that it will depend on the new kernel behavior (and therefore will require Linux 4.0.11 for IPv6 multipath), but we keep the current code in 1.6.x.
We have lots of kit (e.g. https://www.arista.com/en/products/7280r-series) that comes with: Linux labtest 3.4.43.Ar-3964936.4173F #1 SMP PREEMPT Mon Dec 19 14:31:21 PST 2016 x86_64 x86_64 x86_64 GNU/Linux And which is impossible for us to upgrade to newer kernel versions. If bird 2.0 will require Linux >= 4.11 for IPv6 multipath, then upgrading to bird 2.0 would not be an option for us.