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Nexus 5000 Jumbo Packets

HUBERT RESCH
Participant
Participant

Hi all,

on some of our ports on Nexu 5000 and on the connected FEX we can see a lot of Jumbo Packets though there is not enableed any JumboFrame on the Switch, all Interface and system MTU is set to 1500.

Any idea what the reason could be ?

DBE-LINZ-XX41# sh int Eth113/1/27

Ethernet113/1/27 is up

Hardware: 100/1000 Ethernet, address: d0d0.fd1b.b69c (bia d0d0.fd1b.b69c)

Description: LNZTSM01

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

reliability 255/255, txload 23/255, rxload 1/255

Encapsulation ARPA

Port mode is access

full-duplex, 1000 Mb/s

Beacon is turned off

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

Switchport monitor is off

EtherType is 0x8100

Last link flapped 6d05h

Last clearing of "show interface" counters never

30 seconds input rate 852552 bits/sec, 1663 packets/sec

30 seconds output rate 64087584 bits/sec, 5407 packets/sec

Load-Interval #2: 5 minute (300 seconds)

input rate 1.02 Mbps, 1.96 Kpps; output rate 91.23 Mbps, 7.69 Kpps

RX

2485768492 unicast packets 584586 multicast packets 204506 broadcast packets

2486557584 input packets 316104351138 bytes

46589374 jumbo packets 0 storm suppression packets

0 runts 0 giants 0 CRC 0 no buffer

0 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

15585478160 unicast packets 3257120 multicast packets 9075777 broadcast packets

15597811058 output packets 22869193087701 bytes

16174552 jumbo packets

1 output errors 0 collision 0 deferred 0 late collision

0 lost carrier 0 no carrier 0 babble 0 output discard

0 Tx pause

3 interface resets

DBE-LINZ-XX41#

DBE-LINZ-XX41# sh int Eth113/1/27 counters trunk

--------------------------------------------------------------------------------

Port           TrunkFramesTx   TrunkFramesRx     WrongEncap

--------------------------------------------------------------------------------

Eth113/1/27         241207284      132894381               0

DBE-LINZ-XX41# sh int Eth113/1/27 counters errors

--------------------------------------------------------------------------------

Port         Align-Err   FCS-Err   Xmit-Err   Rcv-Err UnderSize OutDiscards

--------------------------------------------------------------------------------

Eth113/1/27       0         0         0         0         0           0

--------------------------------------------------------------------------------

Port         Single-Col Multi-Col   Late-Col Exces-Col Carri-Sen       Runts

--------------------------------------------------------------------------------

Eth113/1/27       0         0         0         0         0           0

--------------------------------------------------------------------------------

Port         Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err

--------------------------------------------------------------------------------

Eth113/1/27       0         --           0           0          0         0

DBE-LINZ-XX41# sh int Eth113/1/27 counters storm-control

--------------------------------------------------------------------------------

Port       UcastSupp %     McastSupp %     BcastSupp %     TotalSuppDiscards

--------------------------------------------------------------------------------

Eth113/1/27     100.00         100.00         100.00                     0

DBE-LINZ-XX41# sh int Eth113/1/27 counters detailed

Ethernet113/1/27

Rx Packets:                                 2486518514

Rx Unicast Packets:                         2485729448

Rx Multicast Packets:                           584561

Rx Broadcast Packets:                           204505

Rx Jumbo Packets:                              46589374

Rx Bytes:                                 316101848567

Rx Packets from 0 to 64 bytes:               1773531487

Rx Packets from 65 to 127 bytes:             567547819

Rx Packets from 128 to 255 bytes:             20043087

Rx Packets from 256 to 511 bytes:             19417196

Rx Packets from 512 to 1023 bytes:             7292742

Rx Packets from 1024 to 1518 bytes:           52096809

Rx Trunk Packets:                             132894381

Tx Packets:                                15597681912

Tx Unicast Packets:                         15585349564

Tx Multicast Packets:                           3257037

Tx Broadcast Packets:                           9075310

Tx Jumbo Packets:                              16174552

Tx Bytes:                               22869001813057

Tx Packets from 0 to 64 bytes:                 34480870

Tx Packets from 65 to 127 bytes:             193872533

Tx Packets from 128 to 255 bytes:             54037447

Tx Packets from 256 to 511 bytes:             87243119

Tx Packets from 512 to 1023 bytes:           335063194

Tx Packets from 1024 to 1518 bytes:         14876810197

Tx Trunk Packets:                             241207284

Output Errors:                                      1

DBE-LINZ-XX41# sh int Eth113/1/27

Ethernet113/1/27 is up

Hardware: 100/1000 Ethernet, address: d0d0.fd1b.b69c (bia d0d0.fd1b.b69c)

Description: LNZTSM01

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

reliability 255/255, txload 23/255, rxload 1/255

Encapsulation ARPA

Port mode is access

full-duplex, 1000 Mb/s

Beacon is turned off

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

Switchport monitor is off

EtherType is 0x8100

Last link flapped 6d05h

Last clearing of "show interface" counters never

30 seconds input rate 852552 bits/sec, 1663 packets/sec

30 seconds output rate 64087584 bits/sec, 5407 packets/sec

Load-Interval #2: 5 minute (300 seconds)

   input rate 1.02 Mbps, 1.96 Kpps; output rate 91.23 Mbps, 7.69 Kpps

RX

   2485768492 unicast packets 584586 multicast packets 204506 broadcast packets

   2486557584 input packets 316104351138 bytes

   46589374 jumbo packets 0 storm suppression packets

   0 runts 0 giants 0 CRC 0 no buffer

   0 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

   15585478160 unicast packets 3257120 multicast packets 9075777 broadcast packets

   15597811058 output packets 22869193087701 bytes

   16174552 jumbo packets

   1 output errors 0 collision 0 deferred 0 late collision

   0 lost carrier 0 no carrier 0 babble 0 output discard

   0 Tx pause

3 interface resets

DBE-LINZ-XX41#

1 Reply 1

Reza Sharifi
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Hi,

The way you can verify to see if jumbo frame size in enabled on the 5k is by issuing command "sh queu interface e113/1/27"

The command sh interface e113/1/27" does not tell you if you have jumbo frame enabled or not.

HTH

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