[c-nsp] problem of both "ip route 0.0.0.0" and "ip default-gateway" configured

[sthaug at nethelp.no]

> Someone mentioned that configuring both commands on the same router/switch
> causes trouble, i wonder if someone can help me understand why?
> 
> 1) ip route 0.0.0.0 next-hop
> 2) ip default-gateway next-hop

Why do you *want* to configure both? 1 is supposed to be used for an L3
box (router), 2 is supposed to be used for an L2 box (switch).

> Also why would configuring a couple of static routes with the next hop being
> an interface name not an ip address cause high CPU ?

If the interface in question is a broadcast medium (Ethernet), the router
doesn't know the next-hop address, resulting in a high rate of ARPs. This
has been dicussed on the list many times before, and the advice is simple:
Don't do it!

Steinar Haug, Nethelp consulting, sthaug at nethelp.no