Engineering
Journal
2.4.2: PPP link negotiation
PPP ensures interoperability between
networking vendors by using several additional protocols, including
the following:
- LCP for negotiating basic line
interoperability
- A family of network control
protocols for negotiating individual Layer 3 protocols and their
options (such as IP Control Protocol [IPCP] for IP and options
such as compression)
When the PPP link is negotiated, a link
control protocol is negotiated to establish the link, and then
additional network control protocols are negotiated.
You can use the command show
interfaces to check the status
of the LCP and the network control protocol and to test the
interoperability of the network layers. There are also excellent debug
ppp
commands for troubleshooting.
To configure the serial line to use
PPP, use the encapsulation ppp
command, as follows:
Router(config)#
interface serial 0
Router(config-if)#
encapsulation ppp
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