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Global Export of IPv6 VPN Routes into the Global BGP IPv6 RIB

VPNv6 routes can be exported from the BGP RIB of an IPv6 VRF to the global IPv6 BGP RIB based on policy by means of a route map and the global export map command.

For example, if you have a mixed IPv4 and IPv6 VPN configuration, but want only the IPv6 VPN routes to be exported from the IPv6 VRF into the global IPv6 RIB, you can use a route map that matches on IPv6 access-lists (IPv6 prefix-lists). You can have the route map disallow IPv4 VPN routes by matching on IPv4 access lists that filter out IPv4 prefixes.

The following commands illustrate this behavior.

Configure an IPv6 access list to export IPv6 VPN prefixes to the global IPv6 RIB.host1(config)#ipv6 access-list everything-v6 permit any any
Configure an IPv4 access list to disallow the export of IPv4 prefixes to the global IPv4 RIB.host1(config)#access-list nothing-v4 deny ip any any
Configure a route map to permit global export of IPv6 VPN routes to the global IPv6 RIB.host1(config)#route-map export-only-v6 host1(config-route-map)#match ip address nothing-v4 host1(config-route-map)#match ipv6 address everything-v6 host1(config-route-map)#set local-preference 444 host1(config-route-map)#exit host1(config)#ip vrf foo host1(config-route-vrf)#global export map export-only-v6

If you need to export both IPv4 and IPv6 VPN routes from the IPv4/IPv6 VRF to the global IPv4 BGP RIB and to the global IPv6 BGP RIB, then configure a route map that permits both IPv4 and IPv6 prefixes.

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