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New Member

Cisco Nexus switches and jumbo frames

Perhaps someone can help us out a little bit. 

We have a Nexus switch that is connected to a bunch of servers and has an upstream connection to our core. 

For some reason we see the switch transmitting a lot of jumbo packets despite the fact that none of the servers are sending jumbo packets. In fact the egress port doesn't see any inbound jumbo packets..

Ethernet1/15 is up

  Hardware: 1000/10000 Ethernet, address: f866.f27d.6fe4 (bia f866.f27d.6fe4)

  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  Port mode is trunk

  full-duplex, 10 Gb/s, media type is 10g

  Input flow-control is off, output flow-control is off

  Rate mode is dedicated

  Switchport monitor is off

  Last link flapped 1week(s) 3day(s)

  Last clearing of "show interface" counters never

  1 minute input rate 30267072 bits/sec, 21384 packets/sec

  1 minute output rate 41052528 bits/sec, 20295 packets/sec


    141428733917 input packets 117006081538 unicast packets 24404722805 multicast packets

    17933114 broadcast packets 0 jumbo packets 0 storm suppression packets

    20710996269479 bytes


    134309200288 output packets 15170283276 multicast packets

    32333 broadcast packets 3234301155 jumbo packets

    23749465522981 bytes

    0 input error 0 short frame 0 watchdog

    0 no buffer 0 runt 0 CRC 0 ecc

    0 overrun  0 underrun 0 ignored 0 bad etype drop

    0 bad proto drop 0 if down drop 0 input with dribble

    76208 input discard

    0 output error 0 collision 0 deferred

    0 late collision 0 lost carrier 0 no carrier

    0 babble

    0 Rx pause 0 Tx pause

How can this be?  Why is it sending jumbo packets?  Is it somehow combing multiple Ethernet packets together?

New Member

Cisco Nexus switches and jumbo frames


did you solve the issue?

i have the same problem with the Nexus 4001i switch.



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