Announce IPv6 default route to a VPN instance of a VPNv6 peer.

The current configuration for the VPNinstanceNAME is as below:

ip vpn-instance VPNinstanceNAME

 ipv4-family

  route-distinguisher 10000:10

  export route-policy rp-AS11111-policy1-exp

  apply-label per-instance

  vpn-target 10000:10 export-extcommunity

  vpn-target 10000:10 10000:11 10000:21 import-extcommunity

 ipv6-family

  route-distinguisher 10000:10

  apply-label per-instance

  vpn-target 10000:10 export-extcommunity

  vpn-target 10000:10 10000:11 10000:21 import-extcommunity

For the old IPv4 protocol, when you configure VPNv4,  there is command below, to advertise the default route via VPN instance..

peer default-originate vpn-instance

Unfortunately, for the VPNv6 there is no such command at the moment and you will have to do the following workaround.

I recommend to configure static IPv6 route in the VPN instance and then configure BGP+4 to publish them to the VPNv6 peer.

ipv6 route-static vpn-instance  VPNinstanceNAME   :: 0  <next hop address>

#

Ipv6-family vpn-instance VPNinstanceNAME

    network ::0