[j-nsp] RIB and FIB - Memory for MX with LR

[Mark Tinka]

On Friday, June 28, 2013 06:52:54 AM joel jaeggli wrote:

> which means the bgp rib can grow to fairly outlandish
> size and not crap up the fib associated with that
> logical system.

I wonder how much more room you could gain if you didn't 
even have to install BGP routes in the RIB.

In IOS XE on the ASR1000, Cisco have a feature, so-called, 
BGP Selective Route Download. It prevents routes from 
entering the RIB on dedicated route reflectors if the route 
reflector clients are all setting the NEXT_HOP attribute to 
"self".

This, apparently, provides a theoretical upper limit of 
between 22,000,000 - 24,000,000 million routes that a single 
router with 16GB of RAM can handle in the control plane a 
dedicated route reflector role. 

The number is brought down by one-third, however, if routes 
are allowed to enter the RIB.

I'll be testing this out myself soon.

Mark.
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