The MPLS-OPS Archive

["Aries C" <cariesc@hotmail.com>]

Wang,

Thanks for the explanation. I believe my mistake was between RT and RD. It's 
clear for me now. Though I have some questions in my previous email ;-)

As Martin says, "Beginner". ;-)

Regards,

Aries C.


>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 21:05:45 +0800
>
>
>Sorry ,make a little mistake in the answer ^_^
>
>Perhaps i don't understand your question very well,but if you only want to 
>let
>the route be transfered between VPN-A and VPN-B,it is nothing with RD
>you can do like this:
>
>PE2 (config)#ip vrf VPN-A
>PE2 (config-vrf)#rd 100:27
>PE2 (config-vrf)#route-target 2:2
>PE2 (config-vrf)#exit
>
>PE3 (config)#ip vrf VPN-B
>PE3 (config-vrf)#rd 100:26
>PE3 (config-vrf)#route-target 2:2
>PE3 (config-vrf)#exit
>
>so ,you see when route study among different VPNs(or we can say VRFs),it 
>only needs
>the same route target.
>if you want to control route study more subtly,you can use the "import" and 
>"export" option
>
>
>----- Original Message -----
>From: "Aries C" <cariesc@hotmail.com>
>To: <mpls-ops@mplsrc.com>
>Sent: Sunday, February 16, 2003 7:53 PM
>Subject: Re: [MPLS-OPS]: Route Distinguisher Questions
>
>
> >
> > >From: "john smith" <johnsmith0302@hotmail.com>
> > >To: wanglei@harbournetworks.com, cariesc@hotmail.com, 
>mpls-ops@mplsrc.com
> > >Subject: Re: [MPLS-OPS]: Route Distinguisher Questions
> > >Date: Sun, 16 Feb 2003 11:18:05 +0000
> > >
> > >>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?
> > >
> >
> > That's a good question. Again, the book mentioned :
> >
> > "However, if this site at some point in the future will become a
> > member of an extranet VPN, do not take this approach because it might 
>incur
> > config. issues when trying to provision the extranet VPN.
> >
> > For example, suppose a different RD is used for each VPN. If a 
>particular
> > site wants to be a member of multiple VPNs, it's not possible to to 
>identify
> > which route distinguisher to use for the site because it belongs to more
> > than one VPN."
> >
> > But I could not digest, where the issue would be, as I have different RD 
>for
> > different VPN anyway. Why I can not route site A of VPN-A (RD 100:27) 
>and
> > site B of VPN-B (RD 100:26) ?? What's the issue ?
> >
> > The problem with assigning unique RD per VRF (even in the same VPN) is
> > operation issue, and perhaps scalability.
> >
> >
> > TIA
> >
> > Aries C.
> >
> >
> >
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