[161917] in North American Network Operators' Group
Re: BCP38 - Internet Death Penalty
daemon@ATHENA.MIT.EDU (William Herrin)
Thu Mar 28 11:40:12 2013
In-Reply-To: <01c501ce2bc3$bb742050$325c60f0$@swan.sk>
From: William Herrin <bill@herrin.us>
Date: Thu, 28 Mar 2013 11:39:45 -0400
To: Adam Vitkovsky <adam.vitkovsky@swan.sk>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, Mar 28, 2013 at 10:51 AM, Adam Vitkovsky <adam.vitkovsky@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.
Regards,
Bill Herrin
--
William D. Herrin ................ herrin@dirtside.com bill@herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
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