From this mode, you can configure address family parameters for BGP VPN services or RIP VPN services.
From Global Configuration mode, type the router bgp command to enter Router Configuration mode for BGP. Type either the address-family ipv4 or address-family vpnv4 command, and then press Enter.
host1(config)#router bgp 100 host1(config-router)#address-family ? ipv4 Configure IPv4 address family vpnv4 Configure VPN-IPv4 address family
From Global Configuration mode, type the router rip command to enter Router Configuration mode for RIP. Type the address-family ipv4 command, and then press Enter.
host1(config)#router rip 100 host1(config-router)#address-family ? ipv4 Configure IPv4 address family