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