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
