How to configure HDLC and PPP step by step guide and example
In this article I will demonstrate how can you configure wan encapsulation protocols. HDLC is the default encapsulation for synchronous serial links on Cisco routers. You should only use the encapsulation hdlc command to return the link to its default state. For practical example of HDLC PPP create a simple topology as shown in figure or download this pre configured topology and load it in packet tracer. Double click on R1 and check the default encapsulation Router> Router#show interfaces serial 0/0/0 Serial0/0/0 is up, line protocol is up (connected) Hardware is HD64570 Internet address is 20.0.0.1/8 MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) [output is omited] As you can verify that default encapsulation on router is HDLC. A wan link work only when it detects same protocols on same sides. To check it change the default encapsulation to PPP. Router#configure terminal Router...

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