Vpnv4 And Ipv4

Hi dear!

The IPv4 address family is for advertising IPv4 Network Layer Reachability Information (NLRI) meaning regular IPv4 networks.

The VPNv4 address family is used to advertise VPNv4 NLRI. VPNv4 address consists of 64-bit Route Distinguisher (RD) prepended to IPv4 prefix. This is to make routes unique that are in different VRFs. The NLRI also includes Route Targets (RT) which are extended communities attached to the NLRI used for defining the topology of the VPN which could be fully meshed, hub and spoke and so on. The VPNv4 family is also used to advertise the VPN label which is used so that the Provider Edge (PE) routers can know which VPN the traffic belongs to.

Hope this helps!

Hi,
IPv4: Exchanges BGP Update messages that contain only routing information. By default, BGP does not allocate labels to common IPv4 routes.
VPNv4: routes in the BGP VPNv4 address family, which are used for route crossover based on RTs to implement mutual access between VPN routes. The Update message exchanged with BGP contains route information, RD information of the VPN to which the route belongs, and label value assigned to the route. BGP allocates labels to VPNv4 routes by default.