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Cisco Bug: CSCus74195 - Incorrect parity handling for certain tables on T2

Last Modified

Aug 08, 2018

Products (7)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3016 Switch
  • Cisco Nexus 3064-T Switch
  • Cisco Nexus 3048 Switch
  • Cisco Nexus 3132Q Switch
  • Cisco Nexus 3172 Switch

Known Affected Releases

6.0(2)U3(1)

Description (partial)

Symptom:
Nexus 3132/3172 and 9K switches (T2-based switches) may experience an incorrect soft parity error recovery that can result in packet loss for one or more affected traffic flows.  This is the result of a Broadcom SDK defect impacting Software Error Recovery (SER) functionality, which automates the recovery of soft memory parity errors.  Known affected memory tables are the L2_ENTRY and L3 LPM tables.  Software releases prior to 6.0(2)U3(4) may also experience an unexpected reload due to plog_sup process crash.
 
A syslog message with the following format is associated with incorrect parity error recovery and can be used to identify the presence of this defect on a device (though there are certain conditions where this defect can be triggered without generation of such as syslog event):
 
%USER-3-SYSTEM_MSG: bcm_usd_isr_switch_event_cb_log:<line#>: slot_num 0, event <x>, memory error type: <Detection|Correction>(0xaddress), table name: <table name>(<address>), index: <index> - bcm_usd
 
Sample messages:
 
%USER-3-SYSTEM_MSG: bcm_usd_isr_switch_event_cb_log:805: slot_num 0, event 2, memory error type: Correction(0x5), table name: L2 table(0x7d6), index: 62432  bcm_usd

%USER-3-SYSTEM_MSG: bcm_usd_isr_switch_event_cb_log_new_fmt:805: slot_num 0, event 2, memory error type: Correction(0x9), table name: L3 LPM table(0x7fe), index: 2685

Conditions:
Nexus 3132/3172 and 9K switches (T2-based switches)
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