[116326] in North American Network Operators' Group
Re: Subnet Size for BGP peers.
daemon@ATHENA.MIT.EDU (Doug McIntyre)
Thu Jul 30 16:22:43 2009
Date: Thu, 30 Jul 2009 15:22:24 -0500
From: Doug McIntyre <merlyn@geeks.org>
To: nanog@nanog.org
In-Reply-To: <F791F668922D4322B895CAEB05DF1A72@bvsupport>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, Jul 30, 2009 at 12:22:27AM -0400, Barton F Bruce wrote:
> So what is wrong with a /31? We use /30s but if you are short on IP space,
> look at using /31 rather than /30 links. Cuts your space usage in half.
/31's are only defined for point-to-point links.
Ethernet isn't considered PtP in general..
Many devices won't accept a /31 on anything but a PtP WAN media type link.
(or not at all).
