Configure the Corporation-A router interfaces

An example of how to configure the Corporation-A router interfaces.

These steps configure the interface addresses on the Corporation-A router.

Specify the interface that connects the Corporation-A router to this Corporation-A client.
```
vyatta@CORPA# set interfaces dataplane dp2p2p2 address 10.0.2.2/24
```
Specify the interface that provides connectivity from the Corporation-A router through the Internet to the other end of the IPsec tunnel.
```
vyatta@CORPA# set interfaces dp2p2p4 address 128.0.0.11/24
```
Ensure that there is an interface with a usable address for the virtual feature point (VFP) interface by specifying a loopback address.
```
vyatta@CORPA# set interfaces loopback lo1 address 169.254.0.1/32
```
Create the VFP interface. Ensure that it is IPv4-enabled by setting it to unnumbered and associating it with the loopback address. No traffic is actually sourced from this address. It is simply a way of enabling interface-dependent features on the VFP.
```
vyatta@CORPA# set interfaces virtual-feature-point vfp1 ip unnumbered donor-interface lo1
```

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