Configure the Supported Address Families and Route Refresh

All BGP negotiated capabilities (except for the 4-Byte-AS capability) can be enabled and disabled using the following commands:
enable bgp neighbor [all |remoteaddr] capability [ipv4-unicast | ipv4-multicast | ipv6-unicast | ipv6-multicast | vpnv4 | route-refresh | ipv4-vxlan | l2vpn-evpn]

disable bgp neighbor [all | remoteaddr] capability [ipv4-unicast | ipv4-multicast | ipv6-unicast | ipv6-multicast | vpnv4 | route-refresh | ipv4-vxlan | l2vpn-evpn]
To configure the capabilities for a peer group, use the following command:
enable bgp peer-group peer-group-name capability [ipv4-unicast | ipv4-multicast | ipv6-unicast | ipv6-multicast | vpnv4 | route-refresh]

disable bgp peer-group peer-group-name capability [ipv4-unicast | ipv4-multicast | ipv6-unicast | ipv6-multicast | vpnv4 | route-refresh]
Note
ExtremeXOS allows the sending and receiving of IPV6 routes over IPV4 peering sessions, and IPV4 routes over IPV6 peering sessions.