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CRC Errors Detected - High CRC errors detected on port e0a

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fabric-interconnect-and-management-switches
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hw
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Applies to

  • AFF-A300
  • ONTAP 9.9.1P9
  • 10G cluster network ports
  • Twinax cable connecting node and switch cluster ports
  • BES-53248 running EFOS 3.8.0.2

Issue

  • One cluster network port reports, hourly, a high amount of CRC errors. Example: 
...
Thu Jun 23 02:05:22 +0200 [node_name-01: vifmgr: vifmgr.cluscheck.hwerrors:alert]: Port e0a on node node_name-01 is reporting a high number (at least 1 per 1000 packets) of observed hardware errors (CRC, length, alignment, dropped).
Thu Jun 23 02:05:22 +0200 [node_name-01: vifmgr: callhome.clus.net.degraded:alert]: Call home for CLUSTER NETWORK DEGRADED: CRC Errors Detected - High CRC errors detected on port e0a node node_name-01
Thu Jun 23 03:05:23 +0200 [node_name-01: vifmgr: vifmgr.cluscheck.hwerrors:alert]: Port e0a on node node_name-01 is reporting a high number (at least 1 per 1000 packets) of observed hardware errors (CRC, length, alignment, dropped).
  • Multiple system health alerts pointing to the source of the issue. Example:
NodeIfInErrorsWarnAlert
The percentage of inbound packet errors of node "node_name-01" on interface "e0a" is above the warning threshold.
 
ClusterIfInErrorsWarn_Alert
The percentage of inbound packet errors of switch interface "switch_name-01/Slot: 0 Port: 2 25G - Level" is above the warning threshold.
The percentage of outbound packet errors of switch interface "switch_name-01/Slot: 0 Port: 1 25G - Level" is above the warning threshold.
  • Errors received in one port and transmitted to the other:

(switch_name-01)#show interface 0/1
Interface :.................................. 0/1
Packets Received Without Error................. 24203865
Packets Received With Error.................... 0
Broadcast Packets Received..................... 4279
Receive Packets Discarded...................... 375
Packets Transmitted Without Errors............. 24677379
Transmit Packets Discarded..................... 897376
Transmit Packet Errors......................... 897376
...

(switch_name-01)#show interface 0/2
Interface :.................................. 0/2
Packets Received Without Error................. 15630167
Packets Received With Error.................... 1019693
Broadcast Packets Received..................... 2265
Receive Packets Discarded...................... 13565
Packets Transmitted Without Errors............. 15644072
Transmit Packets Discarded..................... 1156
Transmit Packet Errors......................... 0
......

  • The issue remains after:
    • Shut down port e0a on the netapp node 02 and reactivated it.
    • Shut down port 0/1 on the BES-53248 cluster network switch and reactivated it.
    • Reseated cable on both ends.
  • Moving the home port for the suspicious cluster LIF, stops the initial error messages reported. 
  • The switch_name-01 port 0/2 is connected to the node_name-02 cluster port e0a.

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