Hi, Saku!

There is only one more 10G port (ingress) in the same VLAN.



On 03/18/2018 11:47 AM, Saku Ytti wrote:
Hey Sergey,


Your intuition seems right. My initial guess as well would be that
these are consequence of microbursts. So any effort to understand
buffer utilisation is needed to exclude or prove that.


Do you have ingress ports operating at 100GE or do you have multiple
10GE ingress ports competing for that 10GE egress port?


On 18 March 2018 at 00:52, Sergey S. <[email protected]> wrote:
Hi,

I'm running NXOS 7.0(3)I5(2) on N3K-C3064PQ-10GE.

Output discards counter is gradually incrementing on one 10G port despite it
not being oversubscribed in those moments of time.

If I look at "sh hardware internal interface asic counters module 1" these
drops are displayed as QOS Tx Drops.

I've tried setting up "hardware profile buffer info port-threshold" even to
the lowest values (e. g., 1%) to figure out if there is a problem with QoS
queues, however there isn't any information in "sh hardware internal buffer
info pkt-stats port-log" (most likely I don't understand the concept of
buffer monitoring and/or it's totally unrelated to my issue).

There isn't any special QoS configuration on the switch. It is just as
follows:

policy-map type network-qos jumbo
   class type network-qos class-default
     mtu 9216
system qos
   service-policy type network-qos jumbo

Not sure whether this gives some clue, anyway, the port in the subject is
connected to a large broadcast domain (Internet Exchange Point).

Thank you for any hint!

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