Another thing to keep in mind is that Cisco does not use a standard HDLC
header. That's why PPP is recommended for interoperability with non-Cisco
devices. Cisco doesn't take advantage of any of the reliability features of
standard HDLC, and Cisco added a field to the header to identify the next
layer up, such as IP, DDP, DECnet, etc.
Cisco's HDLC has been discussed many times on this list, so check the
archives for more details.
Priscilla
At 05:34 AM 9/6/00, michael champion wrote:
>They are all based on the original work done by IBM for SDLC. SDLC uses a
>complicated master-slave scheme that is not used in the other protocols.
>However, the fields in all of the frames of the protocols mentioned were
>basically derived from a special case of the SDLC protocol.
>
>Regards,
>MLC
>
>perez claude-vincent <[EMAIL PROTECTED]> wrote in message
>[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Dear all,
> >
> > I am a little bit confused about the difference of
> > framing between hdlc, sdlc, lapb, lapd, llc2.
> >
> > Can someone help me?
> >
> > Thank you, cvp.
> >
> >
> >
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