input errors on nexus 5548 switch ports connected to iom

[Dragomir]

I am seeing RX input errors on my port channel from my IOM-B to my nexus 5k

on my nexus 5k port channel I see

from A side

input rate 7.37 Mbps, 310 pps; output rate 2.49 Mbps, 260 pps
RX
27428302023 unicast packets 20962452 multicast packets 33191657 broadcast packets
27482456132 input packets 37219041569219 bytes
11163065936 jumbo packets 0 storm suppression bytes
0 runts 0 giants 31019 CRC 0 no buffer
31019 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 0 input discard
0 Rx pause

from B side

RX
32390396895 unicast packets 21521092 multicast packets 26622933 broadcast packets
32438540920 input packets 54630506245813 bytes
15057878555 jumbo packets 0 storm suppression bytes
0 runts 0 giants 101461 CRC 0 no buffer
101461 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
TX

any idea?

[Walter Dey]

Do you mean UCS ? IOM connecting to a fabric interconnect ? not a Nexus 5548 switch ?

[Wes Austin]

If you are getting errors on both sides, you likely have an MTU mismatch.

Please investigate the MTU settings on the vNIC and the QoS policy and ensure there are not jumbo frames traversing these links unnecessarily.