RE: Link capacity upgrade threshold

2009-09-02 Thread Frank Bulk
ptember 02, 2009 1:32 AM To: Bill Woodcock; nanog Subject: Re: Link capacity upgrade threshold > So, in summary: Your dropped packet counters are the ones to be looking at > as a measure of goodput, more than your utilization counters. Indeed. Capacity upgrades are best gauged by drop

Re: Link capacity upgrade threshold

2009-09-02 Thread Richard A Steenbergen
On Wed, Sep 02, 2009 at 08:39:20AM +0200, Mikael Abrahamsson wrote: > On Tue, 1 Sep 2009, Kevin Graham wrote: > > >Indeed. Capacity upgrades are best gauged by drop rates; bit-rates > >without this context are largely useless. > > If you're dropping packets, you're already over the cliff. Our jo

Re: Link capacity upgrade threshold

2009-09-02 Thread Jack Bates
Mikael Abrahamsson wrote: If you're dropping packets, you're already over the cliff. Our job as ISP is to forward the packets our customers send to us, how is that compatible with upgrading links when they're so full that you're not only buffering but you're actually DROPPING packets? Many

Re: Link capacity upgrade threshold

2009-09-01 Thread Mikael Abrahamsson
On Tue, 1 Sep 2009, Kevin Graham wrote: Indeed. Capacity upgrades are best gauged by drop rates; bit-rates without this context are largely useless. If you're dropping packets, you're already over the cliff. Our job as ISP is to forward the packets our customers send to us, how is that compat

Re: Link capacity upgrade threshold

2009-09-01 Thread Kevin Graham
> So, in summary: Your dropped packet counters are the ones to be looking at > as a measure of goodput, more than your utilization counters. Indeed. Capacity upgrades are best gauged by drop rates; bit-rates without this context are largely useless. When you're only aware of the RX side though,

Re: Link capacity upgrade threshold

2009-09-01 Thread Jack Bates
Holmes,David A wrote: 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 Sounds great, unless you don't own the router on the other side of the

RE: Link capacity upgrade threshold

2009-09-01 Thread Deepak Jain
> 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... Without getting into each permutation of a device's architecture, aren't buffer fills really just buffer drops? There are means t

RE: Link capacity upgrade threshold

2009-09-01 Thread Holmes,David A
: 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 b

Re: Link capacity upgrade threshold

2009-09-01 Thread Aaron J. Grier
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

Re: Link capacity upgrade threshold

2009-09-01 Thread Paul Jakma
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

Re: Link capacity upgrade threshold

2009-08-31 Thread Mohacsi Janos
On Sun, 30 Aug 2009, Randy Bush wrote: If your 95th percentile utilization is at 80% capacity, it's time to start planning the upgrade. s/80/60/ the normal snmp and other averaging methods *really* miss the bursts. Agreed. Internet traffic is very burtsy. If you care your customer expe

RE: Link capacity upgrade threshold

2009-08-30 Thread Erik L
> > > If your 95th percentile utilization is at 80% capacity, > it's time to > > > start planning the upgrade. > > > > s/80/60/ > > > > the normal snmp and other averaging methods *really* miss > the bursts. > > s/60/40/ > What is this "upgrade" thing you all speak of? When your links become

Re: Link capacity upgrade threshold

2009-08-30 Thread Richard A Steenbergen
On Sun, Aug 30, 2009 at 01:03:35PM -0400, Patrick W. Gilmore wrote: > >Also, a gig link on a Cisco will do approx 93-94% of imix of a gig > >in the values presented via SNMP (around 930-940 megabit/s as seen > >in "show int") before it's full, because of IFG, ethernet header > >overhead etc.

Re: Link capacity upgrade threshold

2009-08-30 Thread Bill Woodcock
If your 95th percentile utilization is at 80% capacity... s/80/60/ s/60/40/ I would suggest that the reason each of you have a different number is because there's a different best number for each case. Looking for any single number to fit all cases, rather than understanding the underlying

Re: Link capacity upgrade threshold

2009-08-30 Thread Patrick W. Gilmore
On Aug 30, 2009, at 1:23 AM, Mikael Abrahamsson wrote: On Sun, 30 Aug 2009, William Herrin wrote: If your 95th percentile utilization is at 80% capacity, it's time to start planning the upgrade. If your 95th percentile utilization is at 95% it's time to finish the upgrade. I now see why pe

Re: Link capacity upgrade threshold

2009-08-30 Thread Nick Hilliard
On 30/08/2009 17:53, Shane Ronan wrote: What system were you using to monitor link usage? yrtg Nick

Re: Link capacity upgrade threshold

2009-08-30 Thread Shane Ronan
What system were you using to monitor link usage? Shane On Aug 30, 2009, at 8:26 AM, Nick Hilliard wrote: On 30/08/2009 13:04, Randy Bush wrote: the normal snmp and other averaging methods *really* miss the bursts. Definitely. For fun and giggles, I recently turned on 30 second polling on

Re: Link capacity upgrade threshold

2009-08-30 Thread Kevin Oberman
> Date: Sun, 30 Aug 2009 21:04:15 +0900 > From: Randy Bush > > > If your 95th percentile utilization is at 80% capacity, it's time to > > start planning the upgrade. > > s/80/60/ > > the normal snmp and other averaging methods *really* miss the bursts. s/60/40/ If you need to carry large TCP

Re: Link capacity upgrade threshold

2009-08-30 Thread Tom Sands
just wanted to know what is Link capacity upgrade threshold in terms of % of link utilization? Just to get an idea... If your 95th percentile utilization is at 80% capacity, it's time to start planning the upgrade. If your 95th percentile utilization is at 95% it's time to finish the up

Re: Link capacity upgrade threshold

2009-08-30 Thread Peter Hicks
Nick Hilliard wrote: Definitely. For fun and giggles, I recently turned on 30 second polling on some kit and it turned up all sorts of interesting peculiarities that were completely blotted out in a 5 minute average. Would RMON History and Alarms help? I've always considered rolling them o

Re: Link capacity upgrade threshold

2009-08-30 Thread Nick Hilliard
On 30/08/2009 13:04, Randy Bush wrote: the normal snmp and other averaging methods *really* miss the bursts. Definitely. For fun and giggles, I recently turned on 30 second polling on some kit and it turned up all sorts of interesting peculiarities that were completely blotted out in a 5 min

Re: Link capacity upgrade threshold

2009-08-30 Thread Randy Bush
> If your 95th percentile utilization is at 80% capacity, it's time to > start planning the upgrade. s/80/60/ the normal snmp and other averaging methods *really* miss the bursts. randy

Re: Link capacity upgrade threshold

2009-08-29 Thread Mikael Abrahamsson
On Sun, 30 Aug 2009, William Herrin wrote: If your 95th percentile utilization is at 80% capacity, it's time to start planning the upgrade. If your 95th percentile utilization is at 95% it's time to finish the upgrade. I now see why people at the IETF spoke in a way that "core network conges

Re: Link capacity upgrade threshold

2009-08-29 Thread William Herrin
On Sat, Aug 29, 2009 at 11:50 PM, devang patel wrote: > I just wanted to know what is Link capacity upgrade threshold in terms of % > of link utilization? Just to get an idea... If your 95th percentile utilization is at 80% capacity, it's time to start planning the upgrade. I

Re: Link capacity upgrade threshold

2009-08-29 Thread Justin Wilson - MTIN
: devang patel Date: Sat, 29 Aug 2009 21:50:41 -0600 To: Subject: Link capacity upgrade threshold Hi All, I just wanted to know what is Link capacity upgrade threshold in terms of % of link utilization? Just to get an idea... thanks, Devang Patel

Link capacity upgrade threshold

2009-08-29 Thread devang patel
Hi All, I just wanted to know what is Link capacity upgrade threshold in terms of % of link utilization? Just to get an idea... thanks, Devang Patel