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Re: Route Distinguisher Questions

  • From: Ajay Simha <asimha@cisco.com>
  • Date: Mon, 17 Feb 2003 10:09:49 -0500
  • Cc: wanglei@harbournetworks.com, cariesc@hotmail.com, mpls-ops@mplsrc.com
  • Resent-Date: Mon, 17 Feb 2003 11:41:27 -0500
  • To: john smith <johnsmith0302@hotmail.com>
  • User-Agent: Mutt/1.4i

On Sun Feb 16 11:18:05 2003, john smith wrote:
> >From: "wanglei" <wanglei@harbournetworks.com>
> >To: "Aries C" <cariesc@hotmail.com>, <mpls-ops@mplsrc.com>
> >Subject: Re: [MPLS-OPS]: Route Distinguisher Questions
> >Date: Sun, 16 Feb 2003 17:58:20 +0800
> >
> >   RD is the identifier of a vrf,it must be unique in a PE,
> >so in PE ,when a route comes,the PE can find which vrf it
> >belongs to.
> >   Route Target is mainly used for controlling the route table
> >import and export policy.
> >   Don't mix the two.
> >in my opinion:
> >1?? RD is the identifier of VRF, it must be unique in one PE.
> >it can be different even in the same VPN but not in the same PE.
> >but in order to reduce the memory requirements ,each vrf in the
> >same VPN can use the same RD.
> >the core is that RD is the identifer to identify different vrfs
> >in one PE.
> >
> 
> why would i want to use 2 RDs in the same VPN? can you give me a specific 
> example?

May be you did not get a chance to read the entire thread. I had posted details
of hub-and-spoke where you'd need 2 RDs for the same VPN.

-ajay
> 
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