[j-nsp] Independent domain

[biwa net]

Thanks Jeff and David

Makes so much more sense now ,

I wish Juniper docs would be as explicit in their docs

Thanks

On 27 July 2011 16:53, David Ball <davidtball at gmail.com> wrote:

>  Here's how I would nutshell it.  You have a customer VRF whose AS is
> 1.  They advertise routes to you via iBGP. Your core network (the
> primary routing instance) uses AS3.
>
>  Without independent-domain configured, if the customer advertises
> 10.0.0.0/24 to you via iBGP, it'll have their AS1 in the AS path, but
> to transport the advertisement across your core to the other PEs where
> they connect, your core AS3 is added to the AS path by MP-BGP (AS path
> is now  3 1).  When it comes 'out' of the core back into the L3VPN at
> a remote PE, the L3VPN AS1 is added again, making the AS Path  1 3 1,
> which is an AS Loop.  Similar happens if they're doing eBGP with you.
>
> The independent-domain knob ensures that only the ASes in the
> routing-instance are checked during loop detection, and the
> main/primary routing instances (your core's AS3) is not considered.
> By default this is done, per the docs, by using transitive attribute
> 128 which hides the route's as path, LP, etc in the AttrSet so those
> attributes are hidden away during the loop checking.  In newer code
> (10.3+ ?) you can use the 'no-attr-set' knob following the
> 'independent-domain' knob which doesn't use AttrSet and simply does
> loop checking on routing-instances ASes without considering your
> core's AS used in MP-BGP.
>
> HTH,
>
> David
>
>
>
> On 27 July 2011 01:05, biwa net <biwa2go at gmail.com> wrote:
> > Dear All
> >
> > I am having a hard time understanding the concept of "independent-domain
> " ,
> >
> > Although I read the doc about it , the explanation, is not very clearly
> > explained and not very clear in practical terms
> >
> > Anyone can explain in leman terms what is the role of it , and especially
> > can anyone give me some real life example where and how this would be
> > applied ?
> >
> > Thanks
> >
> > Biwa
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>