[c-nsp] Cisco Layer 3 Switch Recommendation

[Florian Weimer]

* Randy Bush:

> ok, i gotta ask.  'switches' do layers 3 & 4 (bgp, ...).  'routers
> do layer 2 (atm, atmv2, ...).  so what is the technical difference
> between a router and a switch?

Switches can duplicate packets efficiently for monitoring purposes,
and routers can't.

This seems to be the only difference is left beyond marketing
(switches are for enterprise networks, routers are for the Internet
core).  Lawful Interceptd is likely going to fix it, though.