I was reading about the Inter-AS MPLS VPN Option C from book ' MPLS in the SDN Era' . In it , the author establishes the BGP-LU peering between PEs and ASBRs and between RR and ASBR only.No BGP-LU peering between PEs and RR.

There is only VPNv4 BGP peering between PEs and RRs.

The reason author mentioned this in bullet point is below (copied from the book 'MPLS in the SDN Era'):

The RRs do not reflect BGP-LU prefixes. The only reason why they negotiate the IPv4-LU address family is for inter-AS RR reachability.

Can someone please explain why RRs dont reflect the BGP-LU prefixes? Many Thanks

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