Hello everyone,
Anyone has same issue like Input Discard counting on Physical Loopback Nexus Data Broker. I'm follow Design ERSPAN Termination for Nexus Data Broker from this documentation.
https://www.cisco.com/c/en/us/td/docs/dcn/nexus-data-broker/310x/use-case/erspan-termination.html
And also i'm follow to avoid oversubscription scenario like this, because input discard can counting if at topology have bottleneck or micro-burst as unexpected traffic.
But untill now input discard still counting
NDB-Switch# show interface ethernet 1/11 | include discard
0 input with dribble 0 input discard
0 lost carrier 0 no carrier 0 babble 2240 output discard
NDB-Switch#show interface ethernet 1/13 | include discard
0 input with dribble 0 input discard
0 lost carrier 0 no carrier 0 babble 575 output discard
module-1# show hardware internal tah buffer counters
Unit: 0 Slice: 0
====================
|------------------------------------------------------------------------------------------------------------------|
| Output Pool-Group drops |
| Drop-PG No-drop CPU--PG LCPU-PG RCPU-PG SPAN-PG |
|------------------------------------------------------------------------------------------------------------------|
Occupancy drops 0 0 0 0 0 0 |
AQM drops 0 0 N/A N/A N/A N/A |
|--------------------------------------------------------------------------------------------------------------------|
| Output UC Pool counters |
| Pool 0 Pool 1 Pool 2 Pool 3 Pool 4 Pool 5 Pool 6 Pool 7 |
|--------------------------------------------------------------------------------------------------------------------|
Dynamic Threshold (cells) 93804 93804 93804 93804 93804 93804 93804 93804 |
Occupancy drops 0 0 0 0 0 0 0 0 |
AQM drops 0 0 0 0 0 0 0 0 |
|--------------------------------------------------------------------------------------------------------------------|
| Output MC Pool counters |
| Pool 0 Pool 1 Pool 2 Pool 3 Pool 4 Pool 5 Pool 6 Pool 7 |
|--------------------------------------------------------------------------------------------------------------------|
Dynamic Threshold (cells) 93804 93804 93804 93804 93804 93804 93804 93804 |
Dynamic Threshold (desc) 93804 93804 93804 93804 93804 93804 93804 93804 |
Dynamic Threshold (inq thr) 64035 64035 64035 64035 64035 64035 64035 64035 |
Occupancy drops 0 0 0 0 0 0 0 0 |
|--------------+---------+---------+---------+---------+---------+--------+---------+---------+|
| Additional counters |
|--------------+---------+---------+---------+---------+---------+--------+---------+---------+|
MEM cell drop reason : 0
MEM descriptor drop reason : 0
OPG cell drop reason : 0
OPG descriptor drop reason : 0
OPG CPU cell drop reason : 0
OPG CPU descriptor drop reason : 0
OPG SPAN cell drop reason : 2815
OPG SPAN descriptor drop reason : 0
OPOOL cell drop reason : 0
OPOOL descriptor drop reason : 0
UC OQUEUE cell drop reason : 0
MC OQUEUE cell drop reason : 0
OQUEUE descriptor drop reason : 0
MC OPOOL cell drop reason : 0
FWD DROP : 642073119
SOD : 0
BMM BP : 0
No Drop : 0
Packets received : 90816417627
TRUNC MTU : 0
TRUNK BMM BP : 0
VOQFC messages sent : 0
SOD messages sent : 0
SPAN desciptor drop : 0
module-1#
Thank You
