I've seen the same thing, like middle of the night when there's almost
no traffic on an AP. But when an AP is obviously overloaded, this stat
is much higher than you'd typically see for those other times. Like a
900 AP sitting there pushing 3.4Mbps will show 15-20% discard rate. And
another time is when I see lots of multipath and a lot of SM downlinks
are running 1X, the AP will be pushing about 1.8-2Mbps and the discard
rate climbs to 35-40%.
On 1/26/2015 1:23 PM, Brian Sullivan wrote:
That looks like the one.
Since we can generate the discards on one AP and one SM, we aren't
using that as an indication that an AP is overloaded.
I assume inbound packets destined for the SM are dropped at the AP due
to MIR settings, thus creating a discard.
On 1/26/2015 12:50 PM, Matt wrote:
The only existing tool built into an AP that does this would be under
Statistics > Throughput and enabling Throughput Monitoring.
This will tell you when you are tossing xx% of RF packets due to an
"overload" condition.
We graph 'RF out discards' on each AP and connection but we seem to
get them
Is this what you graph?
http://support.cambiumnetworks.com/framed/onlinetools/content.WHISP-APS-MIB.html#rfOutDiscardRate
Apparently its not telling you much?
even during low utilization periods.
With 450, we can generate RF discards in the lab with a single AP
and single
SM so we aren't really sure when an AP is overloaded.
Please head over to Cambium's community forum and give Kudos to
these posts:
http://community.cambiumnetworks.com/t5/Your-Ideas/Utilization-per-Sector/idi-p/37968
http://community.cambiumnetworks.com/t5/Your-Ideas/450-AP-Throughput-capacity/idi-p/36808
Alternatively, you can input your AP's session info (current up and
down
modulations) into the Capacity Planner available here:
https://support.cambiumnetworks.com/files/pmp450/
That should give you a theoretical max available bandwidth.
On 1/26/2015 11:57 AM, Matt wrote:
We graph all the ethernet Interfaces on our FSK Canopy AP's etc with
MRTG. Is there a way to graph the actual utilization to see when an
AP is maxed? I know an AP with all 2X clients should have 10mbps
downstream which most ours do. What I cant tell is when an AP has a
mix of 1X and 2X if the AP is maxed out or not by the graph. Same
principle for 450 AP's.
Perhaps there is a packet queue on the AP that gets congested at times
like this I can graph on five minute intervals? Something like that?
