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BCP38 - Internet Death Penalty

On Thu, Mar 28, 2013 at 10:51 AM, Adam Vitkovsky <adam.vitkovsky at swan.sk> wrote:
> What I got on my mind was an eBGP session to stub site /single homed
> customer.

Hi Adam,

"Single homed stub site" is not a configuration option in any BGP
setup I'm aware of, so how would the router select RPF as the default
for a single-homed stub site?

On the other hand, a router can usually make a determination about
"routing protocol is active on this interface."  That's not true of a
few BGP-only configurations, but it's true everywhere else in the
network interior.

Any interface where the routing is 100% static is by definition a
single-homed stub. And for the purposes of this discussion, radius,
tacacs and dhcp are not routing protocols; a radius-assigned route is
static on the interface to which it is assigned. Hence RPF could
safely enable itself by default there.

Bill Herrin

William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004