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Date: Fri, 22 Feb 2002 20:45:31 +0100 From: Jesper Skriver <jesper@skriver.dk> To: Stephen Sprunk <ssprunk@cisco.com> Cc: "Gyorfy, Shawn" <sgyorfy@elinkny.com>, nanog@merit.edu, cisco-nsp@puck.nether.net Message-ID: <20020222204531.A1555@skriver.dk> Mail-Followup-To: Jesper Skriver <jesper@skriver.dk>, Stephen Sprunk <ssprunk@cisco.com>, "Gyorfy, Shawn" <sgyorfy@elinkny.com>, nanog@merit.edu, cisco-nsp@puck.nether.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <036701c1bbc8$016edaa0$e1876540@ssprunkpc>; from ssprunk@cisco.com on Fri, Feb 22, 2002 at 11:27:16AM -0600 Errors-To: owner-nanog-outgoing@merit.edu On Fri, Feb 22, 2002 at 11:27:16AM -0600, Stephen Sprunk wrote: > > Thus spake "Gyorfy, Shawn" <sgyorfy@elinkny.com> > > Since the topic exploded, what are your opinions on encapsulation of > leased > > line DS3s. We currently use Frame Relay for out Point to Point DS3 > > connections. Personally, I don't know why we use FR as our encapsulation, > > and so the question to all. If you are running Cisco to Cisco, would it > be > > wise to run HDLC or PPP? Our DS3s' here are hardly maxed out, 15% or so, > so > > I'm not complaining about the few extra bits I can squeeze out them but > > maybe that 15% can shrink to 10% with less overhead. Opinions or examples > > of life appreciated. > > As you're finding out, this is largely a religious issue. There are no > significant differences in overhead between HDLC, PPP, and FR. Any > performance difference can be more easily attributed to vendor > implementation than to protocol efficiency. > > In practice, HDLC is the dominant encapsulation, primarily since it's > Cisco's default. If for no other reason, you should use HDLC because almost > everyone expects you to be using it. PPP is obviously present in non-Cisco > shops, and anywhere MLPPP or LFI is needed. FR is only used as a p-t-p > encapsulation in certain cases that require it; almost nobody uses it > without a good reason. We allways use PPP, the primary reasons being: - The line protocol goes down when the line is looped. - It's easier to debug than HDLC /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Work: Network manager @ AS3292 (Tele Danmark DataNetworks) Private: FreeBSD committer @ AS2109 (A much smaller network ;-) One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
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