When LCP finishes the link-quality determination phase, network-layer
protocols can be separately configured by the appropriate NCP and can
be brought up and taken down at any time.
In this phase, the PPP devices send NCP
packets to choose and configure one or more network-layer protocols
(such as IP). When each of the chosen network-layer protocols has been
configured, datagrams from each network-layer protocol can be sent
over the link. If LCP closes the link, it informs the network-layer
protocols so that they can take appropriate action. When PPP is
configured, you can check its LCP and NCP states by using the show
interfaces command.
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