traffic accounting

Tue Mar 12 14:38:31 UTC 2013

On 2013-03-12, at 10:32, Valdis.Kletnieks at vt.edu wrote:

> On Tue, 12 Mar 2013 09:25:29 -0400, Joe Abley said:
> 
>> Imagine you have a number of GE and 10GE interfaces spread across multiple
>> MX-class Juniper routers, and for each interface you want to maintain an
>> accurate count of bytes sent, categorised by destination address.
> 
> An important question that may impact possible solutions - exactly how
> accurate does it have to be?

Ideally I'd count every byte, and any deficiencies in the data would be due to unplanned outage rather than systematic short-cutting.

Sampling 1 in 10 packets and multiplying the observed byte count by 10 might be better than nothing, though.

Off-list, someone suggested DCU ("destination class accounting"), but that's limited to 126 classes of counters; another parameter I forgot to mention at the beginning is that there are thousands of destination addresses reached through each of these interfaces, and I'm looking for accounting by destination address, so 126 isn't going to cut it.

Joe
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