RE: rd (route distinguisher) in mpls l3vpn

Thanks Paul, What does make the vpn? Is it the pe's matching up of the vrf
instance and igp to the mp-ibgp ipv4 add fam ? is that were the pairing
happens? And then the pe's rcv'd vpnv4 mpbgp nlri will lock in on the rd
header and strip that and direct the remaining ipv4 nlri into the local vrf
that the rd matched to? Does this have something to do with the makings of
the anatomy of a vpn ? (from the perspective of one pe) ?

Aaron

-----Original Message-----
From: Paul Negron [mailto:negron.paul_at_gmail.com]
Sent: Saturday, March 10, 2012 3:45 PM
To: Aaron; 'CCIE GROUPSTUDY'
Subject: Re: rd (route distinguisher) in mpls l3vpn

The next hop of the route should be different, even if the RD's are the same
on 2 different routers.

The RD's do not HAVE to be different but it is recommended that they should.

The VRF's do not HAVE to be different or the same. It really is a matter of
how confusing you want it to be.:-)

In either case........Neither the RD or the VRF identify the VPN.

Paul

--
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
> From: Aaron <aaron1_at_gvtc.com>
> Reply-To: Aaron <aaron1_at_gvtc.com>
> Date: Sat, 10 Mar 2012 15:16:25 -0600
> To: 'Aaron' <aaron1_at_gvtc.com>, 'CCIE GROUPSTUDY' <ccielab_at_groupstudy.com>
> Subject: RE: rd (route distinguisher) in mpls l3vpn
> 
> I think it's self-explanatory..how would you be able to *distinguish*
routes
> if they header (rd) prepended to the ipv4 prefix isn't unique from
another.
> 
>  
> 
> So within a L3VPN..
> 
>  
> 
> Ce1----pe1----p----pe2-----ce2
> 
>  
> 
> .I understand that the pe's have the vrf and rd's within them...does the
vrf
> A rd of pe1 need to be different than the vrf A rd of pe2 ?
> 
>  
> 
> Aaron
> 
>  
> 
>  
> 
> From: Aaron [mailto:aaron1_at_gvtc.com]
> Sent: Saturday, March 10, 2012 3:11 PM
> To: 'CCIE GROUPSTUDY'
> Subject: rd (route distinguisher) in mpls l3vpn
> 
>  
> 
> does the rd have to be unique?
> 
>  
> 
> Aaron
> 
> 
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