[c-nsp] Router recommendation for small ISP

[Nick Hilliard]

On 17/02/2011 09:11, Mounir Mohamed wrote:
> It depends on the number of BGP sessions you gone use, multiple BGP sessions
> with full internet routing table (340K right now) will be stored smoothly on
> an RP with 4G or 8G memory, but after completing the BGP decision process it
> will end up with less than 500k on the forwarding path (ESP5 with 500k
> limit), so till now no problem,  but if you are planning to use a multipath
> option (rare in ISP) you may have a problem.

A hard 500k prefix limit means that the hardware has an effective useful 
lifetime in the DFZ of maybe 2 years at a maximum.  If your depreciation 
period is > 2 years, you need to consider getting a device with more tcam 
than this.  The larger asr1ks fit the bill in this regard.

Nick