[ppml] "Recommended Practices" procedure

Hello;

On Jun 30, 2006, at 9:38 AM, Scott Leibrand wrote:

> On 06/30/06 at 9:01am -0400, Robert E.Seastrom  
> <ppml at rs.seastrom.com> wrote:
>
>> Scott Leibrand <sleibrand at internap.com> writes:
>>
>>> To multihome with PA space, you must ensure that your transit  
>>> providers,
>>> and any of their transit providers (recursive), accept your /48  
>>> from each
>>> other.
>>>
>>> Still pretty simple, no?
>>
>> There's an implicit assumption here that peers (as opposed to  
>> upstream
>> transits) do not filter.  History has shown counting on this to be  
>> unwise.
>
> No, I'm not making that assumption.  I'm saying that only your
> transit-free transit providers need to exchange your route.   
> Everyone else

How do I determine which of my transit providers are transit-free ?

What do I do if one fine day no provider available to me is transit- 
free ?

Regards
Marshall

> can send the traffic towards the provider's /32 aggregate, and once it
> enters the provider's network the more-specific /48 will take over.
> That's not ideal for traffic engineering or route optimization, but  
> it's
> adequate for reachability.
>
> -Scott