Why not take a look at X.25 the protocol accounted for "missing frames".
I'm not sure about the specifics of what HDLC does if a CRC error occurs,
but I'd imagine it would re-transmit
At 01:16 PM 3/26/01 -0700, you wrote:
>I did read your statement correctly.
>
>Which datalink protocols retransmit errored frames without the
>knowledge of the host? Are there some that do it by default? Are there
>some that don't do this by default but can be configured to do so?
>
> >>> "Brandon Ripper" <[EMAIL PROTECTED]> 3/26/01 12:43:16 PM
> >>>
>
>What can be seen by my statement is that the host would re-transmit
>unless
>there was a CRC problem on the serial link that the protocol corrected
>on
>its own. Please read more carefully.
>
>
>At 11:40 AM 3/26/01 -0700, you wrote:
> >Lest we go through all of this again, a few weeks ago there was a
>great
> >thread on this very topic. The resolution was that in just about
>every
> >situation, it is the hosts that do the retransmitting, NOT the
>routers!
> >To find out why, go to the archives and search through the last three
> >months for a topic similar to this one. There is a some very useful
> >information contained therein.
> >
> >HTH,
> >John
> >
> > >>> "Brandon Ripper" <[EMAIL PROTECTED]> 3/26/01 11:25:10
>AM
> > >>>
> >Hello,
> >
> > Well, it depends what type of transmission problem occurs.
>If
> >a
> >CRC failure occurs on the serial link depending upon the protocol
>being
> >
> >used between devices then that data may or may not be re-transmitted.
> >However, if either error checking is not present, or the devices do
>not
> >
> >notice a problem, then the sending host will re-transmit packets per
> >TCP/IP
> >standard. The receiving host will actually request the
>re-transmission.
> >But
> >like I said, if a CRC error were to occur in a serial line protocol
> >then
> >neither host would be the wiser, and it would the routers would
> >re-transmit.
> >
> >Brandon Ripper -ccna
> >
> >At 10:37 AM 3/26/01 -0700, you wrote:
> > >Hi All,
> > >
> > >I know I should know this, but frankly I can not remember the
>details
> >to
> > >save my life...
> > >
> > >Let's say we have two routers connected over a serial link, they
>are
> >doing
> > >routing, not bridging. If the serial line takes a hit who is
> >responsible for
> > >retransmitting? The sending host or the first router?
> > >
> > >Now let's say same config but the routers are bridging over the
>serial
> >line.
> > >Who retansmits, the sending host or the first bridge?
> > >
> > >TIA
> > >
> > >John Hardman
> > >
> > >
> > >_________________________________
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> >
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