Re: MPLS L3 VPN Questions

Route Targets simply tell what one router is exporting and what other router
should import ..

For example if you want R1 to talk to R2 ....

On r1 ; you say route-target export 1:1111 and on r2 you say route-target
import 1:1111

Thanks
Gaurav Madan

On Fri, Jun 3, 2011 at 9:01 PM, Elliott Reyes <
fontananetworkengineer_at_gmail.com> wrote:

> Hey Guys,
>
> I'm just trying to get a better understanding of how to build these
> MPLS VPN's properly and I guess the documentation and INE workbook just
> confuses me a little bit. So if anyone can assist me that would be great.
>
>
> Like Denzel in the movie Philadelphia. Explain it to me like I'm a 6 year
> old.
>
> 1. When defining the VRF's between two PE routers.
>
>
> Example
>
> R1
>
> Step 1 - Create VRF locally on R1
>
> ip vrf VPN_A
>
> rd 100:1 <---- ROUTE DISTINGUISHER (This is locally significant to R1 and
> add's a 8 byte value to IPV4 prefix to create a VPNIPV4 prefix. )
>
>
> Step 2 - Assign Route-Target command
> route-target both 100:1 <----- allows routing information from to traverse
> from R1 VPN_A to R2 VPN_A thru their connected interfaces and import/export
> routing information.
>
> R1 <----------> R2
>
> int fa0/1 (R1)
> ip vrf forwarding VPN_A
> ip add 10.1.1.1 255.255.255.0
>
>
> R2
>
> Step 1 - Create VRF locally on R2
>
> ip vrf VPN_A
>
> rd 100:1 <---- ROUTE DISTINGUISHER (This is locally significant to R2 and
> add's a 8 byte value to IPV4 prefix to create a VPNIPV4 prefix. )
>
>
> Step 2 - Assign Route-Target command
> route-target both 100:1 <----- allows routing information from to traverse
> from R2 VPN_A to R1 VPN_A thru their connected interfaces and import/export
> routing information.
>
> Question - Does the route-target have to match the route distinguisher on
> both ends. if the route-target is say 100:2 and the route distinguisher is
> 100:1 on VPN_A this technically shouldn't work
> across the VPN correct.
>
> R2 <----------> R1
>
> int fa0/1 (R2)
> ip vrf forwarding VPN_A
> ip add 10.1.1.2 255.255.255.0
>
>
> thanks
>
>
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Received on Fri Jun 03 2011 - 21:37:45 ART