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Jumbo Frame TX counter is increasing even though the MTU is set to 1500 and the VLAN is not configured

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • IX4‑T 10GbE network interface card (NIC)
  • Ethernet interfaces with MTU 1500 configured end to end
  • TCP Segmentation Offload (TSO) enabled on the NIC/port
  • Switch environment with no jumbo frames recorded in interface counters

Issue

  • ONTAP ifstat output shows jumbo frame transmit (TX) counter increasing on a specific port.
  • Network MTU is set to 1500 across the environment.
  • Switch interface statistics report no jumbo frames transmitted or received.
Example:
 
TRANSMIT
Total frames:    47975m | Frames/second:    2150  | Total bytes:     46756g
Bytes/second:     2095k | Total errors:        0  | Errors/minute:       0
Total discards:    110k | Queue overflow:    110k | Multi/broadcast:   743k
Collisions:          0  | Xon:                 0  | Xoff:                0
Pause:               0  | Jumbo:            2189m | Cfg Up to Downs:     0
TSO non-TCP drop:    0  | Split hdr drop:      0  | Timeout:             0
TSO segments:     2202m | TSO bytes:       40158g | TSO6 segments:       0
TSO6 bytes:          0  | HW UDP cksums:   14211  | HW UDP6 cksums:      0
HW TCP cksums:   21781m | HW TCP6 cksums:      0  | Mcast v6 solicit:    0
Lagg drops:          0  | Lagg no buffer:      0  | Lagg no entries:     0

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