nanog mailing list archives
RE: [nsp] Cisco DS3 Questions..
From: "Daniel Golding" <dgolding () sockeye com>
Date: Fri, 22 Feb 2002 11:52:04 -0500
That sub-interface numbering is useless for a point-to-point circuits. - Daniel Golding
-----Original Message----- From: Eric So [mailto:eric.so () graduate hku hk] Sent: Thursday, February 21, 2002 5:16 PM To: Gyorfy, Shawn Cc: 'nanog () merit edu'; 'cisco-nsp () puck nether net' Subject: Re: [nsp] Cisco DS3 Questions.. The proprietry HDLC will give you headache if you want to change the platform in the future. FR encap gives you sub-interface numbering which acts as an identifier to network devices through a proper indexing scheme. -e On Thu, 21 Feb 2002, Gyorfy, Shawn wrote:Since the topic exploded, what are your opinions onencapsulation of leasedline DS3s. We currently use Frame Relay for out Point to Point DS3 connections. Personally, I don't know why we use FR as ourencapsulation,and so the question to all. If you are running Cisco to Cisco,would it bewise 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. Opinionsor examplesof life appreciated. Thanks shawn -----Original Message----- From: Iljitsch van Beijnum [mailto:iljitsch () muada com] Sent: Wednesday, February 20, 2002 4:28 PM To: Jon Mansey Cc: nanog () merit edu Subject: Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? On Wed, 20 Feb 2002, Jon Mansey wrote:OMG! Arent we missing the point here? What about neverrunning links above60% or so to allow for bursts against the 5 min average, and <shudder> upgrading or adding capacity when we get too little headroom.And here we are, nickel and diming over a few MBps near to45M on a DS3...And why not? Obviously there is a reason why they're not upgrading, because there is plenty of traffic to fill up a second or faster circuit if packets are being dropped because of congestion. (Which has not been confirmed so far.) There shouldn't be any problems pushing a DS3 well beyond 99%utilization,by the way. With an average packet size of 500 bytes and 98packets in theoutput queue on average, 99% only introduces a 9 ms delay. The extra RTT will also slow TCP down, but not in such a brutal way as significant numbers of lost packets will. Just use a queue size of 500 or so, and enable (W)RED to throttle back TCP when there are large bursts.
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- RE: [nsp] Cisco DS3 Questions.. Daniel Golding (Feb 22)
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- RE: [nsp] Cisco DS3 Questions.. Martin, Christian (Feb 22)