By default, the BGP configuration done under bgp routing process will be applicable for IPv4 Unicast AFI. On the below topology, R2 and R4 acts as PE routers with VPN COKE configured. R3 acts as Route reflector for R2 and R4.
The above configuration shows that R3 is configured as Route reflector with R2 and R4 as clients. It can be noted that, the route reflection is not configured under VPNv4 AFI. So R3 will reflect only IPv4 BGP updates from R4 and R2 and not VPNv4.
The VPNv4 routes in R4 will not be present in R2’s BGP table,
Now configuring route reflection in VPNv4 AFI will enable R3 to reflect VPNv4 routes between the clients.