nanog mailing list archives
Re: [nsp] Cisco DS3 Questions..
From: Jesper Skriver <jesper () skriver dk>
Date: Fri, 22 Feb 2002 20:45:31 +0100
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 ofleasedline 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 itbewise to run HDLC or PPP? Our DS3s' here are hardly maxed out, 15% or so,soI'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.
Current thread:
- Cisco DS3 Questions.. Gyorfy, Shawn (Feb 21)
- Re: Cisco DS3 Questions.. Christopher A. Woodfield (Feb 21)
- Re: Cisco DS3 Questions.. Justin Streiner (Feb 21)
- Re: Cisco DS3 Questions.. Barton F Bruce (Feb 21)
- Re: [nsp] Cisco DS3 Questions.. Stephen Sprunk (Feb 22)
- Re: [nsp] Cisco DS3 Questions.. Bill Woodcock (Feb 22)
- Re: [nsp] Cisco DS3 Questions.. Niels Bakker (Feb 22)
- Re: [nsp] Cisco DS3 Questions.. Jesper Skriver (Feb 22)
- Re: [nsp] Cisco DS3 Questions.. Mike Joseph (Feb 22)
- Re: [nsp] Cisco DS3 Questions.. Jesper Skriver (Feb 22)
- Re: [nsp] Cisco DS3 Questions.. Eliot Lear (Feb 25)
- Re: [nsp] Cisco DS3 Questions.. Jesper Skriver (Feb 25)
- Re: [nsp] Cisco DS3 Questions.. Robert E. Seastrom (Feb 25)
- Re: [nsp] Cisco DS3 Questions.. Jesper Skriver (Feb 25)
- Re: Cisco DS3 Questions.. Christopher A. Woodfield (Feb 21)