Partial vs Full tables

Mike Hammett nanog at
Sat Jun 6 11:10:30 UTC 2020

Does anyone have a non-paywalled version of that FIB Compression page? 

Mike Hammett 
Intelligent Computing Solutions 


----- Original Message -----

From: "Yang Yu" <yang.yu.list at> 
To: "William Herrin" <bill at> 
Cc: "Tore Anderson" <tore at>, nanog at 
Sent: Friday, June 5, 2020 8:07:52 PM 
Subject: Re: Partial vs Full tables 

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. 

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