IPv4 address

The IP addressing schema selected for this book follows the template outlined here:

• Loopback Interface IP: x.x.x.x/32, where x is the router number, 1 for PE1, 2 for P2 and so on.
• Physical Interface IP: The Point-to-Point (P2P) link subnet is xy.0.0.0/24, where x < y

  Nx: xy.0.0.x/24, Ny: xy.0.0.y/24, for link between Nx: PE1 and Ny: P2, it would be 12.0.0.1/24 and 12.0.0.2/24, respectively, and so on

The loopback IP schema helps identify the router easily, while the P2P link IP schema helps in identifying the routers at either end of a particular link. The next section provides the template using this schema.

Template

The template used for configuring the loopback interface is as follows.

Interface Loopback0

The best practice for IP address configuration of a loopback interface is to use a host address with a /32 notation, as it does not participate in any subnet, as shown here:

interface Loopback0
 ipv4 address {{ x.x.x.x }} 255.255...