Routing Question

[dspazman at epicup.com]

That is what I thought, but I had someone questioning me, so I wanted to make sure from the experts... ;)

Thanks!

-----Original Message-----
From: "Alex Bligh" <alex at alex.org.uk>
Sent: Thursday, June 28, 2012 10:00am
To: dspazman at epicup.com, bird-users at trubka.network.cz
Cc: "Alex Bligh" <alex at alex.org.uk>
Subject: Re: Routing Question



--On 28 June 2012 09:47:56 -0700 dspazman at epicup.com wrote:

> If you have 2 discrete sites, both with BGP, one announces a
> 100.100.100.0/20, and another announcing 100.100.100.0/24, will traffic
> for the /24 block always go to the site announcing the /24, even if it's
> closer to the site announcing the /20?

The more specific route, if accepted, will always win, irrespective of
any other consideration. This is true on both IPv4 and IPv6, and is
fundamental to IP routing rather than specific to BGP.

-- 
Alex Bligh