[j-nsp] Independent domain

[Jeff Richmond]

Biwa, it is most commonly used in L3VPN scenarios where you want to perform IBGP between the PE and CE instead of the more common EBGP.

It would look similar to this:

someone at R1> show configuration routing-options | match autonomous 
autonomous-system 65412;

So, my internal backbone ASN is 65412, but in this case the customer wants to do IBGP with me and their ASN is 65600.

someone at R1> show configuration routing-instances VPNC 
instance-type vrf;
interface ge-0/0/1.411;
vrf-target target:65412:600;
routing-options {
    autonomous-system 65600 independent-domain;
}
protocols {
    bgp {
        group IBGP {
            type internal;
            neighbor 192.168.30.1;
        }
    }
}

someone at R1> show route table VPNC 

VPNC.inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

10.5.0.0/16        *[BGP/170] 00:05:26, localpref 100
                      AS path: I
                    > to 192.168.30.1 via ge-0/0/1.411
10.6.0.0/16        *[BGP/170] 00:04:12, localpref 100, from 10.200.16.3
                      AS path: I
                    > to 10.200.2.2 via ge-0/0/0.110, label-switched-path R1-R9
192.168.30.0/24    *[Direct/0] 00:05:28
                    > via ge-0/0/1.411
192.168.30.2/32    *[Local/0] 00:05:31
                      Local via ge-0/0/1.411
192.168.31.0/24    *[BGP/170] 00:04:12, localpref 100, from 10.200.16.3
                      AS path: I
                    > to 10.200.2.2 via ge-0/0/0.110, label-switched-path R1-R9


Hope this helps.
-Jeff

On Jul 27, 2011, at 12:05 AM, biwa net 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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