[116327] in North American Network Operators' Group
Re: Subnet Size for BGP peers.
daemon@ATHENA.MIT.EDU (Roy)
Thu Jul 30 17:01:53 2009
Date: Thu, 30 Jul 2009 14:01:36 -0700
From: Roy <r.engehausen@gmail.com>
CC: nanog@nanog.org
In-Reply-To: <20090730202224.GA54330@geeks.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Doug McIntyre wrote:
> 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).
>
>
Since it isn't PtP, one also has to allow the customer to connect
multiple devices.
