Re: Single AS multiple Dirverse Providers

["Patrick W. Gilmore" <patrick () ianai net>]

On Jun 10, 2013, at 12:54 , Joe Provo <nanog-post () rsuc gweep net> wrote:
> On Mon, Jun 10, 2013 at 11:36:44AM -0500, Dennis Burgess wrote:

> > I have a network that has three peers, two are at one site and the third
> > is geographically diverse, and there is NO connection between the two
> > separate networks.
>
> So, you have two islands? Technically, that would be separate 
> ASNs as they are separatre routing policies, but the modern 
> world has adapted. 

Should we change the rules? I know with 64-bit ASNs mean it is tough to run out of ASNs, but not sure we really want 
each island to be its own AS going forward.

Comments from the peanut gallery?

-- 
TTFN,
patrick


> > Currently we are announcing several /24s out one network and other /24s
> > out the second network, they do not overlap.  To the internet this works
> > fine, however, providers a/b at site1 do not send us the two /24s from
> > site b..   We have requested them to, but have not seen them come in,
> > nor do we have any filters that would prohibit them from coming in. 
> >
> > Is this normal?  Can we receive those routes even though they are from
> > our own AS?  What is the "best practice" in this case?  
>
> To prevent loops in the global Internet the BGP specification
> dictates this behavior, and has in all versions. Depending on 
> your platform and theirs, you will all need to turn several 
> knobs before you are allowed to break these rules. I would 
> recommend that you gain more than passing familiarity with 
> why the protocol is built this way, how it affects your use
> case, and what concerns you might have WRT your providers
> before you change the behavior for your case.
>
> Cheers,
>
> Joe
>
> -- 
>         RSUC / GweepNet / Spunk / FnB / Usenix / SAGE / NANOG