We will generally refer to IPv4 in this book; IPv6 is supported in the same way as IPv4, as a different address family.
See RFC 2547bis.
See draft-ietf-l3vpn-ipsec-2547 (work in progress).
See draft-townsley-l2tpv3-mpls (work in progress).
See draft-ietf-l3vpn-gre-ip-2547 (work in progress).
For general considerations about route reflectors, consult Cisco ISP Essentials, ISBN 1-58705-041-2; MPLS and VPN Architectures, ISBN 1-58705-002-1.