Counters and Statistics Overview
Note
This section does not apply to the
SLX 9150/
Extreme 8520 devices.
SLX-OS uses algorithmic and sequential sampling
simultaneously. This combination ensures that the entire counter engine database is
periodically delivered into the software. You can set the sequential sampling timer
to a lower rate as the overflow is prevented by algorithmic sampling.
Statistics collection mechanisms
In this implementation, statistics collection
uses counter engines as a collection mechanisms.
With counter engines:
- There are 16 on-chip counter engines with 16k packet and octet counters each.
- Two mini counter engines B0/B1 are dedicated to the egress queue and support 4k 64-bit entries.
- Each counter engine can be individually assigned to a statistics source.
- A statistic flow is mapped to a set of counters within one of the counting engines.
- A packet is mapped to a counter pair within a counter set according to the packet's disposition (drop/forward status) and color.
