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Cisco Bug: CSCta92364 - Incorrect handling of EIO training requests causing LC reload.

Last Modified

Feb 09, 2017

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases


Description (partial)


LC get reloaded after seeing size mismatch error on POS SPA interfaces. The problem happens when there is a high rate size mismatch error is reported by pse_driver. The size mismatch error triggers EIO link training. If there are higher number of EIO training requests then some of the EIO link training fails. There is a threshold for 27 EIO training failure per sec that can be handled without reloading the LC. If it exceeds 27/sec then the LC reloads.

LC/0/5/CPU0:Jul 16 18:30:05.061 : pse_driver[181]: %L2-PSE-4-ERRRATE_EXCEED_FAST : Ingress device: High rate of ASIC errors of type: isi_link0_sz_mm_err 
LC/0/5/CPU0:Jul 16 18:30:05.552 : pse_driver[181]: %L2-PSE-2-NODE_BRINGDOWN : Ingress device: Caused by Err recovery reset threshold exceeded  : pkg/bin/pse_driver : (PID=45104) :  -Traceback= 4010b74c 4010c52c 4a8c8c8c 4a8c443c 40130a44 40130bd0 40130f7c 4a899a3c 4a892c88 40130330 40132924 40132a9c 40102be4 4a1652f0 4a16311c 40103e64

When there is a mix of error frame and good frame in the link may be because of faulty line or other condition that may trigger the sz_mm_error (CSCsq50261). If the rate of the sz_mm_error is high that can trigger the EIO training failure and LC reload.
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