ISP MPLS Core Network

[EbrahimAlkhayat]

Dear All,

I have a topology which represent an ISP MPLS Core Network. the topology use BGP, OSPF, EIGRP, MPLS and VRFs. the topology consist of 5 BGP autonomous systems, 4 autonomous system have 2 customer sites. 1 autonomous system connect the 4 autonomous systems together. each autonomous system use OSPF as internal routing protocol. customer sites use VRFs in PE routers and EIGRP. the purpose is to make all customers sites ping each other. the question is how to make the ping goes from one site in autonomous system 1 to another site in autonomous system 2 or 3 or 4 ?. redistribution was done in OSPF for BGP subnets and in BGP for OSPF routes, this makes all 5 autonomous systems able to ping each other but not the VRFs.  please look at the attachment to view the topology.

[BannerMOTD]

You will need to setup MPLS VPN and get your route-targets configured. Route-targets allowed for certain traffic to be imported and exported from a given VRF. You will need to setup multiprotocol BGP with the VPNv4 address family extension.  

https://www.cisco.com/c/en/us/td/docs/net_mgmt/vpn_solutions_center/2-0/mpls/provisioning/guide/PGmpls1.html

[EbrahimAlkhayat]

this can be done between PE routers who have VRFs with CE routers. but what about the PE routers that connect to the autonomous system 500 (Core Network)?. they do not have any VRFs, they only connect the autonomous system to the main autonomous system 500 who route the traffic to another autonomous systems. please take a look at the attachment.