Activate IPv6 Address Family for Dynamic BGP Neighbors Using User Defined VRF

To configure multi-protocol BGP for exchanging IPv6 prefixes over IPv4 BGP Sessions for Dynamic BGP Neighbors using user defined VRF, do the following:

Access global configuration mode.
```
 device# configure terminal 
```
Access BGP configuration mode.
```
device(config)# router bgp
```
Specify the autonomous system in which your device resides.
```
device(config-bgp-router)# local-as 1000
```

Navigate into the Peer Group context.

device(config-bgp-router)# neighbor pgMain peer-group
	%Warning: Please activate Peer-group for IPv6 address-family

Specify the autonomous system in which the remote dynamic BGP neighbors reside. Assign the remote-as to the peer-group.
```
device(config-bgp-router)# neighbor pgMain remote-as 1001
```

Navigate to the IPv4 Unicast Address Family context of the user defined VRF.

device(config-bgp-router)# address-family ipv4 unicast vrf red
device(config-bgp-ipv4u-vrf)#

Specify the IPv4 address range assigned to the dynamic BGP neighbors and assign that range to the peer group.
```
device(config-bgp-ipv4u-vrf)# listen-range 10.0.2.0/24 peer-group pgMain 
```

Exit out of the IPv4 Address Family context.

device(config-bgp-ipv4u-vrf)# exit
device(config-bgp-router)#

Navigate to the IPv6 Unicast Address Family context of the user defined VRF. This enables IPv6 address family for the VRF.
```
device(config-bgp-router)# address-family ipv6 unicast vrf red
device(config-bgp-ipv6u-vrf)#
```

Exit out of the IPv6 Address Family context.

device(config-bgp-ipv6u-vrf)# exit
device(config-bgp-router)#

Configure the IPv6 address family.

device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)#

Activate the IPv6 Address Family for the peer group.
```
device(config-bgp-ipv6u)# neighbor pgMain activate
```

Example

The following is a consolidation of tasks to perform to activate IPv6 address family for a BGP peer using default VRF.

router bgp
local-as 1000
neighbor pgMain peer-group
neighbor pgMain remote-as 1001
address-family ipv4 unicast vrf red
listen-range 192.0.2.0/24 peer-group pgMain
address-family ipv6 unicast vrf red
address-family ipv6 unicast 
neighbor pgMain activate