From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Tue Mar 06 2007 - 15:41:03 ART
PPP Reliable Transmission
http://www.faqs.org/rfcs/rfc1663.html
1. Introduction
By default, PPP packets over HDLC framed links consist of
"connectionless" datagrams. If reliable transmission over the HDLC
link is desired, the implementation MUST specify the Numbered-Mode
Configuration Option during Link Establishment phase.
Generally, serial link reliability is not a major issue. The
architecture of protocols used in datagram networking presume
best-effort non-sequential delivery. When errors are detected,
datagrams are discarded.
However, in certain circumstances, it is advisable to provide a
reliable link, at least for a subset of the messages. The most
obvious case is when the link is compressed. Since the dictionary is
recovered from the compressed data stream, and a lost datagram
corrupts the dictionary, datagrams must not be lost. Not all
compression types will require a reliable data stream, since the cost
to detect and reset a corrupt dictionary is small.
--Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP) bdennis@internetworkexpert.com Internetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Direct: 775-745-6404 (Outside the US and Canada)
On 3/6/07 10:06 AM, "nhatphuc" <nhatphuc@gmail.com> wrote:
> Hi Group > > Using ppp reliable-link makes the link reliable. Can you tell me what > reliable link is? > > Thanks > > Phuc > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Apr 01 2007 - 06:35:50 ART