http://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/12_2sy/mp_12_2sy_book/mp_vpn_ipv4_ipv6.html#wp1055032
The following is an example of a multiprotocol VRF with route-target policies defined in both global and address-family areas:
- For IPv6, the route-target definitions are defined under the address family. These definitions are used and the route-target definitions in the global area are ignored. Therefore, the IPv6 VPN ignores import 100:2.
- For IPv4, no route-target policies are defined under the address family, therefore, the global definitions are used.
vrf definition vfr1
route-target export 100:1
route-target import 100:1
route-target import 100:2
!
address-family ipv4
exit-address-family
!
address-family ipv6
route-target export 100:1
route-target import 100:1
route-target import 100:3
exit-address-family
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