mpls vpn route-target

OK. I have topology like this:

R1 -- R3 -- R2 --R4 --R5
                        |
                       R6

R1 and R5 are pure customer routers in VPNA, and R6 is customer router in VPNB.
R3 and R4 are PE routers and R2 is just P router.
R1 and R5 are using EIGRP as routing protocol, and R6 is running OSPF.
Everything is redistributed in MP-BGP and vice-versa for every VPN and
working OK.

Task says that router R6 needs to participate in the same CUG as R1 and R5.

On R3 I have vrf:
!
ip vrf VPNA
 rd 1:20
 route-target export 1:105
 route-target import 1:105
!
on R4 vrf:
!
ip vrf VPNA
 rd 1:40
 route-target both 1:105
!
ip vrf VPNB
 rd 1:50
 route-target both 1:600

As I understand RTs, when you say route-target both in some vrf it
means that all routes which has this ext BGP community will be
exported from vrf into MP-BGP, and imported from MP-BGP into vrf,
right?

Shouldn't next solution be enough for R1 and R5 to have VPNB's OSPF
routes in its routing tables, and R6 to have VPNA's EIGRP routes in
its routing table as OSPF E2 routes:

ip vrf VPNA
 rd 1:20
 route-target export 1:105
 route-target import 1:105
route-target import 1:600 (importing routes that were exported from vrf VPNB)

ip vrf VPNB
 rd 1:50
 route-target export 1:600
 route-target import 1:600
 route-target import 1:105 (importing routes that were exported into
MP-BGP from vrf VPNA)

?? After this R6 has all VPNA's routes as E2 routes but R1 doesn't
have VPNB's routes as D EX routes ??

Solution of the task says just this:
ip vrf VPNB
   route-target both 1:105

Some clarification please. Thanks

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Received on Mon Nov 02 2009 - 19:47:52 ART