Thanks for the clarification - So RP1 will accept up to available ram in RIB 
(What happens when it exceeds available ram?), and then FIB will accept up to 
1M prefixes(best path), which is currently ~460K....so on an RP1 you have an 
additional ~500k of prefixes(IPv4) that it will still accept?
 

> CC: [email protected]
> From: [email protected]
> Subject: Re: [c-nsp] ASR1000 RP1 and BGP
> Date: Fri, 6 Sep 2013 08:07:05 +0200
> To: [email protected]
> 
> You're mistaking FIB for RIB. RIB will take whatever fits in available 
> memory, usually way more than 1M of IPv4 routes. FIB is limited to 1M 
> prefixes, but only bestpaths land here, so with number of full feeds you'll 
> usually anyway land at around 460k of prefixes. Try to search in archives for 
> a lot of details.
> 
> -- 
> ./
> 
> > On 6 wrz 2013, at 07:51, CiscoNSP List <[email protected]> wrote:
> > 
> > 
> > Another question on the ASR1000 :)
> > 
> > RP1 supports 1M IPv4 routes i.e. ~2 full tables...If you bring on a third 
> > full table, will you see rib failure (memory) for all routes that exceed 
> > 1M? (Assume yes?)
> > 
> > How is the rib allocation calculated?  if you added(peered) 4 full tables 
> > (sequentially, one after the other), would the bgp sessions after the 1st 
> > and second be the ones that are rejected, and then it is based on route 
> > churn? (So would routes from peer 3 and 4 be added during churn?)
> > 
> > Cheers.                         
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