nanog mailing list archives
Re: Cisco PPP DS-3 limitations - 42.9Mbpbs?
From: "Stephen Sprunk" <ssprunk () cisco com>
Date: Wed, 20 Feb 2002 12:29:07 -0600
Thus spake "Randy Bush" <randy () psg com>
if you're using five min (or three min) samples, and you're seeing 70%, peaks are likely much higher and some users' packets are being dropped. by 80%, enough packets are being dropped that users are likely to see the effects of exponential backoff. things do not improve above 80%.
One should note that any utilization up to 59.8% is, on average, indistinguishable from an empty line. 70% = 1.6x delay, 80% = 3.2x, 90% = 8.1x, and 95% = 18.05x. Of course, once you figure in finite buffering, anything past 59.8% is likely to be dropping packets. ObMath: Plot r^2/(1-r). Where the derivative exceeds one (r~0.598), delay increases faster than traffic rate. Assumes random arrival times. S
Current thread:
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs?, (continued)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Stephen J. Wilcox (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs?y Neil J. McRae (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Randy Bush (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Greg Maxwell (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Randy Bush (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Alex Rubenstein (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Jon Mansey (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Iljitsch van Beijnum (Feb 20)
- RE: Cisco PPP DS-3 limitations - 42.9Mbpbs? Steve Naslund (Feb 20)
- RE: Cisco PPP DS-3 limitations - 42.9Mbpbs? Iljitsch van Beijnum (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Stephen Sprunk (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Randy Bush (Feb 20)
- Re: Cisco PPP DS-3 limitations - 42.9Mbpbs? Dave Israel (Feb 20)
- RE: Cisco PPP DS-3 limitations - 42.9Mbpbs? Steve Naslund (Feb 20)