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[MX] 'resource error' and 'input packet rejects' increase when setting 'no-flow-control' at the PPE overloaded status

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Article ID: KB35779 KB Last Updated: 15 Jun 2020Version: 1.0
Summary:

This article explains the behavior when setting 'no-flow-control' at the PPE overloaded status.

Solution:

In the PPE overloaded status, â€‹packets drop at the pre-classifier, then reports as 'resource error' and 'input packet rejects' error. However, 'input packet rejects' error has other contributors such as 'unknown iif' or 'unknown protocol'. Therefore, 'resource error' is the most accurate counter of ppe-overloaded-drop.

  • 'unknown iif' stands for unknown input interface drop caused by RPF check failure.
  • 'unknown protocol' means lookupchip failed in checking the protocol part of the packet.

Example:

Physical interface: xe-1/0/0, Enabled, Physical link is Up
...
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 165467470  <--
...
Filter statistics:
Input packet count               616202271
Input packet rejects             165467470  <--

MX#  show precl-eng 1 statistics
stream    Traffic
port      ID       Class             TX pkts               RX pkts Dropped pkts
------  -------  ----------          ---------             --------- --------------
00      1025        RT          0000000000000000      0000000000000000 0000000000000000
00      1026        CTRL        0000000000000023      0000000000000023 0000000000000000
00      1027        BE          0000000661509416      0000000496041946 0000000165467470  <--

This is FAD (functioning as designed).

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