Configuring Point-to-Point WANs

This brief section explains how to configure leased lines between two routers, using both HDLC and PPP. The required configuration is painfully simply—for HDLC, do nothing, and for PPP, add one interface subcommand on each router’s serial interface (encapsulation ppp). However, several optional configuration steps can be useful, so this section explains those optional steps and their impact on the links.