[nsp] sizing a router

[Rubens Kuhl Jr.]

> i need some help in sizing a router for the following scenario. perhaps
> people can share their experiences and what theyve got in production. i'd
> want the box to be comfortable on cpu and other resources to cater for
spike
> load etc..
>
> box will be running atm OC3 155Mbps pretty much at full capacity, with Gig
> Ethernet to local lan, and will be running bgp,ospf,netflow,wccp with
> standard imix packet size.

Nothing can assure you that inbound packet size will be imix... and during
some kinds of DDoS, even outbound packet size will get smaller (RSTing
unallowed connections, for instance).

Unless your upstream can do some sort of limiting by packets per second,
you'll have to use the smallest packet size in your design.


Rubens