On Wed, 11 May 2022 at 21:22, Grant Taylor via NANOG <nanog@nanog.org> wrote: > > On 5/11/22 10:53 AM, Job Snijders via NANOG wrote: > > This knob slightly increase your own memory consumption, but makes your > > router more “neighbourly”! :-) > > I question how accurate "slightly" is. > > My understanding is that soft reconfiguration inbound (whatever the > syntax for a given IOS is) causes a full copy of the received prefix > list to be retained in memory for each of the peers with soft > reconfiguration enabled. > > So, to me, the amount of impact to memory will be based on both the > number of prefixes advertised and the number of peers that soft > reconfiguration is enabled on. > > Please enlighten me if I'm wrong / misunderstanding something.
True and the amount of memory used per prefix also depends on things like BGP communities. When I tested this, on 32 bit XR I had a memory increase of about 400 MB for a full feed 2 years ago. But with or without soft-reconfig inbound always, your memory usage increases with more prefixes. I don't see any drastic change in scaling numbers because of this on today's HW. Lukas
