CISCO_HDLC(4)               BSD Programmer's Manual              CISCO_HDLC(4)

NAME
     ciscohdlc - Cisco HDLC serial line encapsulation

SYNOPSIS
     #include <sys/types.h>
     #include <sys/ioctl.h>
     #include <net/if.h>
     #include <net/pppioctl.h>

     options CISCOHDLC

DESCRIPTION
     The CISCO_HDLC serial line encapsulation provides a method for transmit-
     ting datagrams over synchronous serial point-to-point links.  The current
     Cisco HDLC implementation includes support for the Cisco Serial Line Ad-
     dress Resolution Protocol (SLARP).

     The kernel configuration option CISCO_HDLC should be defined to include
     the relevant code in the kernel.

     Cisco HDLC encapsulation and SLARP have no configurable options.

     Since synchronous interfaces support more than one link-level protocol,
     Cisco HDLC should be selected before any data will be transmitted through
     the interface.  Currently, to select Cisco HDLC on synchronous inter-
     faces, the interface flag IFF_LINK0 should be cleared (see ifconfig(8)).

SEE ALSO
     ioctl(2),  socket(2),  intro(4),  ifconfig(8),

BUGS
     Currently only IP transport level is supported; future releases may be
     extended to include OSI and Xerox NS.

BSDI BSD/386                    March 27, 1993                               1