vifmgr reporting CRC errors on multiple interfaces

Applies to

• ONTAP 9
• FAS / AFF Systems
• CRC errors reporting on multiple ports

Issue

• Users are reporting performance issues and ONTAP latency is low.
• Multiple interfaces report CRC errors.

Cluster::> event log show -message-type *crc*
Mon May 25 09:05:14 CEST [node01: vifmgr: vifmgr.cluscheck.crcerrors:alert]: Port e0e on node node01 is reporting a high number of observed hardware errors, possibly CRC errors.
Mon May 25 09:05:14 CEST [node01: vifmgr: vifmgr.cluscheck.crcerrors:alert]: Port e0f on node node01 is reporting a high number of observed hardware errors, possibly CRC errors.
Mon May 25 09:55:14 CEST [node01: vifmgr: vifmgr.cluscheck.crcerrors:alert]: Port e0h on node node01 is reporting a high number of observed hardware errors, possibly CRC errors.

• ifstat increases the CRC errors counter.

Cluster::> node run node01 ifstat e0h

-- interface  e0h  (5 days, 12 hours, 52 minutes, 9 seconds) --

RECEIVE
Total frames:     1534m | Frames/second:    3208  | Total bytes:      2236g
Bytes/second:     4674k | Total errors:      845  | Errors/minute:       0
Total discards:      0  | Discards/minute:     0  | Multi/broadcast: 31966k
Non-primary u/c:     0  | CRC errors:        843  | Runt frames:         0
Long frames:         2  | Length errors:     101  | Alignment errors:    0
No buffer:           0  | Pause:               0  | Jumbo:             179m
Noproto:             0  | Bus overruns:        0  | LRO segments:    14947m
LRO bytes:        2012g | LRO6 segments:       0  | LRO6 bytes:          0
Bad UDP cksum:       0  | Bad UDP6 cksum:      0  | Bad TCP cksum:       0
Bad TCP6 cksum:      0  | Mcast v6 solicit:    0  | Lagg errors:         0
Lacp errors:         0  | Lacp PDU errors:     0

• There may be link flapping on the affected ports:

Wed Jan 24 12:46:43  0100 [node01: mgmt_port_link_status_poll: netif.linkDown:info]: Ethernet e0e: Link down, check cable.
Wed Jan 24 12:46:43  0100 [node01: intr: net.ifgrp.lacp.link.inactive:error]: ifgrp a0a, port e0e has transitioned to an inactive state. The interface group is in a degraded state.
Wed Jan 24 12:46:43  0100 [node01: vifmgr: vifmgr.portdown:notice]: A link down event was received on node node01, port e0e.
Wed Jan 24 12:46:44  0100 [node01: mgmt_port_link_status_poll: netif.linkUp:info]: Ethernet e0e: Link up.
Wed Jan 24 12:46:44  0100 [node01: vifmgr: vifmgr.portup:notice]: A link up event was received on node node01, port e0e.

• Output errors on switch ports.