IPv6 BGP & kernel 4.19

[Frederik Kriewitz]

On Sun, Dec 1, 2019 at 12:57 PM Daniel Suchy <danny at danysek.cz> wrote:
> One idea that comes in my mind is default kernel limit for IPv6 routes
> in memory (sysctl net.ipv6.route.max_size); and such default is quite
> low for fullbgp/DFZ IPv6 deployments and it's still set to 4096 on
> Debian/Buster with stock kernels. Can people having issues with 4.19
> kernels check sysctl mentioned above?

This is our current suspicion too. neighbours and routes are well
below 4096 in our case. We also had to adjust
net.ipv6.neigh.default.gc_thresh1/2/3. Since the adjustment it's been
working fine.