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