[c-nsp] BGP table growth and memory

[Joe Maimon]

Gert Doering wrote:
> Hi,
> 
> On Mon, Jun 20, 2005 at 10:04:25AM -0700, Rick Ernst wrote:
> 
>>Is there any way of estimating base/operating memory requirements based on
>>table size, number of peers, etc?  Is 256MB only OK "for another 2-3
>>years", or am I turning myself into Chicken Little?
> 
> 
<snip>
> you use a more memory hungry IOS, like 12.2(25)S.  Dunno about 12.3 or 
> recent 12.0S memory usage rates.  (And of course, this is pure speculation).
> 
Two full tables,Multipath, NPE-G1, 12.4(1a)

Processor Pool Total:  921695156 Used:  289057040 Free:  632638116

One full table,......

Processor Pool Total:  921695156 Used:  236149360 Free:  685545796




> We've recently started upgrading all core routers that need to be 
> touched anyway to 512 Mb or even 1 Gb in the NPE-G1 routers.  
> 
> Unfortunately, we still have a number of NPE-225 and NPE-300 routers, 
> so we're also looking at alternatives - like "drop all routes more 
> specific than a /20 from /8 blocks that live in other continents"
> (what do I care about misguided traffic engineering ideas from some
> of these networks?  They go over my upstream anyway).  
> 
> This is not unproblematic, though, so be aware of all consequences
> (especially if you have BGP downstreams that expect to receive a *full*
> BGP table from you).
> 
> gert
> 
>