kindly see following, same BGP neighbor has been activated in global, VRF & VPNv4 BGP...

router bgp 1
bgp log-neighbor-changes
neighbor 10.200.254.2 remote-as 1
neighbor 10.200.254.2 update-source Loopback0
!
address-family ipv4
redistribute rip
neighbor 10.200.254.2 activate
exit-address-family
!
address-family vpnv4
neighbor 10.200.254.2 activate
neighbor 10.200.254.2 send-community both
exit-address-family

The mention config is done for PE .

The post config is not showing any VRF detail.

BGP Global Config

router bgp 1
bgp log-neighbor-changes
neighbor 10.200.254.2 remote-as 1
neighbor 10.200.254.2 update-source Loopback0

GLOBAL ADDRESS FAMILY FOR ISP NO RELATION WITH ANY VRF - It is redistributing RIP network in BGP

address-family ipv4
redistribute rip
neighbor 10.200.254.2 activate
exit-address-family

GLOBAL CONFIG FOR ISP or PE ROUTER VPNv4 to RUN MP-BGP VPN
address-family vpnv4
neighbor 10.200.254.2 activate
neighbor 10.200.254.2 send-community both
exit-address-family

And then you can start configuring the Customer VRF in BGP Address family

For Example :

Customer Address Family

address-family ipv4 vrf Cust_A
neighbor X.X.X.X remote-as XXXX  ------ EBGP for CE
neighbor X.X.X.X activate

redistribute connected

exit-address-family

thank u..

address-family ipv4
redistribute rip
neighbor 10.200.254.2 activate
exit-address-family

neighbor 10.200.254.2 is already activated in vpnv4 add-family, i dont think we need to activate again in ipv4..

Please find more detail : For Same

BGP Global Config used for only Specify the Peers.

router bgp 1
bgp log-neighbor-changes
neighbor 10.200.254.2 remote-as 1
neighbor 10.200.254.2 update-source Loopback0

USE OF ADDRESS FAMILY IPv4

The IPv4 address family is used to identify routing sessions for protocols such as BGP that use standard IP version 4 address prefixes,  So you need to activate in IPv4  for Routing Session.

address-family ipv4
redistribute rip
neighbor 10.200.254.2 activate
exit-address-family

USE OF ADDRESS FAMILY VPNv4

The VPNv4 multicast address family is used to identify routing sessions for protocols such as BGP that use standard VPN Version 4 address prefixes.VPNv4 routes are the same as IPv4 routes, but VPNv4 routes have a route descriptor (RD) prepended that allows replication of prefixes.

Here you can See if you intergrate the same with above config : 

ip vrf Cust_A

rd 1:100

route-traget both 1:100

address-family ipv4 vrf Cust_A

redistribute Connected

neighbore X.X.X.X remote as XXXX

negihbore X.X.X.X activate

In this the address family is map with VRF Cust_A &  RD is 100

For this BGP address family will run different routing session with RD of 100 for VRF Cust_A.

And the previously address family that is not associated with any VRF it won't use VPNv4 for route update and that run in Global BGP routing table.

Hello Mukarram,

>> neighbor 10.200.254.2 is already activated in vpnv4 add-family, i dont think we need to activate again in ipv4..

No, with MP BGP you can activate PER address-family so if you want to exchange IPv4 routes and VPNv4 routes with this neighbor you need to activate on both address families

http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_bgp3.html#wp1030691

there is a default but it is the opposite for AF ipv4 unicast

As a best practice to avoid to depend from IOS image and platform I recommend to activate in all address families

In old times the switch from BGP to MP BGP was given by using

no bgp default ipv4-unicast

see

http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_bgp1.html#wp1012800

if this is used you need to activate in each address family

Hope to help

Giuseppe