Link capacity upgrade threshold

Shane Ronan sronan at fattoc.com
Sun Aug 30 11:53:35 CDT 2009


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 some kit and it turned up all sorts of interesting  
> peculiarities that were completely blotted out in a 5 minute average.
>
> 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.
>
> There's a lot to the saying that QoS really means "Quantity of  
> Service", because quality of service only ever becomes a problem if  
> there is a shortfall in quantity.
>
> Nick
>





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