Option 3: Multi-Hop MP-eBGP Between RR and eBGP Between ASBRs
This approach is considered to be more scalable than option 1 or option 2. In this option, VPNv4 information is held by the RRs. To meet this requirement, each provider needs to have local RRs for VPNv4 prefix distribution and eBGP connection to exchange prefixes with the external peer. The ASBRs in this option participate in exchange of BGP next-hop-address using IPv4 labels, and RRs form an MP-eBGP session to transport VPNv4 information. Figure 7-25 shows a multiprovider VPN network that is providing VPN services to sites belonging to Customer A.
Figure 7-25. MPLS VPN Network Using Option 3
P1-AS1-RR and P1-AS2-RR are RRs that are local to each of the provider’s ...
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