nanog mailing list archives
RE: Link capacity upgrade threshold
From: "Holmes,David A" <dholmes () mwdh2o com>
Date: Tue, 1 Sep 2009 15:00:56 -0700
Another approach to collecting buffer utilization is to infer such utilization from other variables. Active measurement of round trip times (RTT), packet loss, and jitter on a link-by-link basis is a reliable way of inferring interface queuing which leads to packet loss. A link that runs with good values on all 3 measures (low RTT, little or no packet loss, low jitter with small inter-packet arrival variation) can be deemed not a candidate for bandwidth upgrades. The key to active measurement is random measurement of the links so as to catch the bursts. The BRIX active measurement product (now owned by EXFO) is a good active measurement tool which randomizes probe data so as to, over time, collect a randomized sample of link behavior. -----Original Message----- From: Aaron J. Grier [mailto:agrier () poofygoof com] Sent: Tuesday, September 01, 2009 12:19 PM To: nanog () nanog org Subject: Re: Link capacity upgrade threshold On Tue, Sep 01, 2009 at 11:55:45AM +0100, Paul Jakma wrote:
On Sun, 30 Aug 2009, Nick Hilliard wrote:In order to get a really good idea of what's going on at a microburst level, you would need to poll as often as it takes to fill the buffer of the port in question. This is not feasible in the general case, which is why we resort to hacks like QoS to make sure that when there is congestion, it is handled semi-sensibly.Or some enterprising vendor could start recording utilisation stats?
do any router vendors provide something akin to hardware latches to keep track of highest buffer fill levels? poll as frequently/infrequently as you like... -- Aaron J. Grier | "Not your ordinary poofy goof." | agrier () poofygoof com
Current thread:
- Re: Link capacity upgrade threshold Paul Jakma (Sep 01)
- Re: Link capacity upgrade threshold Aaron J. Grier (Sep 01)
- RE: Link capacity upgrade threshold Holmes,David A (Sep 01)
- RE: Link capacity upgrade threshold Deepak Jain (Sep 01)
- Re: Link capacity upgrade threshold Jack Bates (Sep 01)
- RE: Link capacity upgrade threshold Holmes,David A (Sep 01)
- <Possible follow-ups>
- Re: Link capacity upgrade threshold Kevin Graham (Sep 01)
- Re: Link capacity upgrade threshold Mikael Abrahamsson (Sep 01)
- Re: Link capacity upgrade threshold Jack Bates (Sep 02)
- Re: Link capacity upgrade threshold Richard A Steenbergen (Sep 02)
- RE: Link capacity upgrade threshold Frank Bulk (Sep 07)
- Re: Link capacity upgrade threshold Mikael Abrahamsson (Sep 01)
- Re: Link capacity upgrade threshold Aaron J. Grier (Sep 01)