VRF - Definition mode
When configuring VRFs, the VRF definition mode can be used to give a VRF a name and to enter VRF configuration mode. This can be done using the following command sequence:
Router(config)# vrf definition vrf1
Once definition mode is entered, various options for configuring the VRF are made available. The following context sensitive help shows some of these:
R1(config)#vrf definition vrf1 R1(config-vrf)#? VPN Routing/Forwarding instance configuration commands: address-family Enter Address Family command mode default Set a command to its defaults description VRF specific description exit Exit from VRF configuration mode help Description of the interactive help system ipv4 VRF IPv4 configuration no Negate a command or set its defaults rd Specify Route Distinguisher route-target Specify Target VPN Extended Communities vnet Virtual NETworking configuration vpn Configure VPN ID as specified in rfc2685 R1(config-vrf)#
The available options will depend upon the platform and IOS version.
Links:
https://forum.networklessons.com/t/bgp-ipv6-route-filtering-on-cisco-ios/1238/24?u=lagapidis
https://networklessons.com/mpls/vrf-lite-configuration-on-cisco-ios
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/evn/command/evn-cr-book/evn-a1.html#wp2571401685