Partial vs Full tables

Yang Yu yang.yu.list at
Sat Jun 6 01:07:52 UTC 2020

On Fri, Jun 5, 2020 at 10:39 AM William Herrin <bill at> wrote:
> Speak of which, did anyone ever implement FIB compression? I seem to
> remember the calculations looked really favorable for the leaf node
> use case (like James') where the router sits at the edge with a small
> number of more or less equivalent upstream transits. The FIB is the
> expensive memory. The RIB sits in the cheap part of the hardware.

fib optimize => using LPM table for LEM

FIB compression => install only 1 entry into FIB for compressable
routes with shared nexthop

The feature itself works as intended. version/platform/config
compatibility needs some considerations.

More information about the NANOG mailing list