However, to change the encapsulation back to HDLC from PPP, use the following command from interface configuration mode: Router(config-if)#encapsulation hdlc HDLC is the default encapsulation on serial links in a Cisco router. PPP has to be used when communicating with non-Cisco devices. This field makes it possible for a single serial link to accommodate multiple network-layer protocols.Ĭisco’s HDLC is a point-to-point protocol that can only be used on serial links or leased lines between two Cisco devices. Because the standardized HDLC cannot support multiple protocols on a single link (lack of a mechanism to indicate which protocol is carried), Cisco developped a proprietary version of HDLC, called cHDLC, with a proprietary field acting as a protocol field. HDLC is a data link protocol used on synchronous serial data links.
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