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Jumbo frames registering on ports

CiscoPurpleBelt
Frequent Contributor
Frequent Contributor

I am seeing the counter of jumbo packets going up on 2 ports connected to a server when neither the server or switch is configured for jumbo. The switch is a Nexus 3500 series. Anyone know why?

6 Replies 6

Joseph W. Doherty
Hall of Fame Master Hall of Fame Master
Hall of Fame Master
Tagged frames?

Yes as the ports are trunks allowing a couple vlans.

I think that behavior is only on the Nexus series. Can you post the output from one of the interfaces?

I think that is harmless anyway.

HTH

Ok here is sh interface. I was having an issue before as to why I was concerned. Jumbo seen on same port on Switch b that the same server is dual homed to.

 

 

Sw_A# sh interface et1/8                                                         
Ethernet1/8 is up                                                                           
 Dedicated Interface  
Belongs to Po2                                                                           
  Hardware: 100/1000/10000 Ethernet, address: 00d7.8faa.5caf (bia 00d7.8faa.5caf)           
  Description: NetApp_Node1_eth1                                                            
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec                                              
  reliability 255/255, txload 1/255, rxload 32/255                                          
  Encapsulation ARPA                                                                        
  Port mode is trunk                                                                        
  full-duplex, 1000 Mb/s, media type is 1G                                                  
  Beacon is turned off                                                                      
  Input flow-control is off, output flow-control is off                                     
  Rate mode is dedicated                                                                    
  Switchport monitor is off                                                                 
  EtherType is 0x8100                                                                       
  Last link flapped 06:38:17                                                                
  Last clearing of "show interface" counters 06:38:34                                       
  1 interface resets                                                                        
  Load-Interval #1: 30 seconds                                                              
  30 seconds input rate 129695864 bits/sec, 10680 packets/sec                               
  30 seconds output rate 1997016 bits/sec, 3452 packets/sec                                 
  Load-Interval #2: 5 minute (300 seconds)                                                  
    input rate 128.87 Mbps, 10.56 Kpps; output rate 1.88 Mbps, 3.17 Kpps                    
  RX                                                                                        
    248606923 unicast packets  802 multicast packets  0 broadcast packets                   
    248602363 input packets  376930697408 bytes                                             
    242881368 jumbo packets  0 storm suppression packets                                    
    0 runts  0 giants  7 CRC  0 no buffer                                                   
    7 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                                                                                        
    75586218 unicast packets  0 multicast packets  13 broadcast packets                     
    75586231 output packets  5495379870 bytes                                               
    15257 jumbo packets                                                                     
    0 output errors  0 collision  0 deferred  0 late collision                              
    0 lost carrier  0 no carrier  0 babble 0 output discard                                 
    0 Tx pause                   

Can you post the output of "sh que int et1/8"?

HTH

It won't take that command closest thing is sh int queuing-drop history.

Here is a counters if this helps or let me know what else.

 

Ethernet1/8                                                                    
  Rx Packets:                                   413373546                      
  Rx Unicast Packets:                           413377564                      
  Rx Multicast Packets:                              1340                      
  Rx Jumbo Packets:                             403751721                      
  Rx Bytes:                                  626606672174                      
  Rx Packets from 0 to 64 bytes:                   339852                      
  Rx Packets from 65 to 127 bytes:                  25403                      
  Rx Packets from 128 to 255 bytes:                106689                      
  Rx Packets from 256 to 511 bytes:                362119                      
  Rx Packets from 512 to 1023 bytes:               239275                      
  Rx Packets from 1024 to 1518 bytes:             8553854                      
  Rx Trunk Packets:                             413377564                      
  Tx Packets:                                   123161431                      
  Tx Unicast Packets:                           123161410                      
  Tx Broadcast Packets:                                21                      
  Tx Jumbo Packets:                                 25191                      
  Tx Bytes:                                    8986472051                      
  Tx Packets from 0 to 64 bytes:                114723381                      
  Tx Packets from 65 to 127 bytes:                  90750                      
  Tx Packets from 128 to 255 bytes:               8138634                      
  Tx Packets from 256 to 511 bytes:                 78381                      
  Tx Packets from 512 to 1023 bytes:                46767                      
  Tx Packets from 1024 to 1518 bytes:               58327                      
  Tx Trunk Packets:                             123144455                      
  Input CRC Errors:                                     9                      
  Input Errors:                                         9  

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