[136051] in North American Network Operators' Group
Re: IPv6: numbering of point-to-point-links
daemon@ATHENA.MIT.EDU (Seth Mattinen)
Mon Jan 31 22:43:59 2011
Date: Mon, 31 Jan 2011 19:43:01 -0800
From: Seth Mattinen <sethm@rollernet.us>
To: nanog@nanog.org
In-Reply-To: <4D46EDA4.2030907@ispn.net>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 1/31/11 9:13 AM, Blake Hudson wrote:
>
> I setup a p2p /127 link and found that BGP would not peer over the link;
> Changing to /126 resolved the problem. I never looked into it further
> because I had intended to use /126 from the start. My guess is that
> while BGP should be a unicast IP, Cisco's implementation uses an anycast
> in some cases, disregarding the configured unicast address.
>
> Just one practical example...
>
Sprint runs a /127 for my dual stack circuit with BGP; I know their side
is Cisco as is mine.
~Seth
