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Spirent KB Article
Doc ID: KNI17182
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Spirent TestCenter: Streamblocks reports very large false drop count.
Symptoms
When running 1000 flows with 2 different stream blocks the drop count shows 99.89% of packet loss but Tx and Rx count is 100%.
Environment
PX3 Yellowstone
Explanation/Resolution
RIT is only supported on
Yellowstone performance mode
. Without
RIT
support on the
default mode
, there is no mechanism on the FPGA generator side to handle the sequence number so, invalid sequences are sent and causing the drop counts to occur. Unfortunately, this is the design limitation since the
PX3 Yellowstone default mode
supports a maximum of 64 paths.
A solution for this issue is to change the port to
performance mode.
Root Cause
This is related to path compression.
When configured paths
<=64
, no path compression is needed, the FW writes all the information into the
VFD1
and
VFD6
, and no drop count occurs.
When configured paths
>64
, the
BLL
will do the path compression (all the paths are compressed into one
item
for this configuration) and
RIT
should be enabled. This
item
will be written to
VFD6
and
RIT
(BAR1 + 0x16000)
.
Version
1.0
Publish Date
2022-11-23
Categories
Product : PX3,Spirent TestCenter
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