[c-nsp] IOS XR BGP

[Mark Tinka]

On Tuesday, November 29, 2011 09:40:30 PM Gert Doering 
wrote:

> Most ISPs these days do not seem to have customers that
> use BGP-based multihoming using networks from the ISP's
> PA blocks - but of course, exceptions happen (we have
> one customer that uses an IPv6 /48 from our /32 due to
> historic reasons).

We do have some customers that announce our own space back 
to us because they multi-home to us and need some kind of 
independent route control.

However, we make it mandatory that we can only allow for 
this kind of scenario if the customer uses a private ASN to 
peer with us.

If the customer has their own PI or PA space, chances are 
they have (or can easily get) a public ASN.

If the customer has a public ASN and they want to multi-home 
with it, they should use their own PI or PA space to connect 
to us.

This policy ensures that if customers ever announce our own 
routes back to us legally, those routes ALWAYS stay within 
our network, and never leak on to the Internet or to other 
eBGP peers. Keeps the global table lean and mean, keeps us 
good netizens.

Mark.
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