Jumbo frames on extender in N7K

Hi all,

I have strange Jumboframes issue. From cards M148GT and F248XP all prosts forward packets biger then 1992 bytes.

But on extender ports (extender are connected to n7k) any Jumbo frames goes out from host (all are droped).

I check it and in N7k i have enabled "system jumbomtu 9216". On all port-channels I have set 9216 mtu.

Even sh int eth x/x/x shows that port on extender have enabled MTU 9216 bytes.

 

Some shows from N7K:

 

Software

  BIOS:      version 2.12.0

  kickstart: version 6.2(10)

  system:    version 6.2(10)

  BIOS compile time:       05/29/2013

  kickstart image file is: bootflash:///n7000-s2-kickstart.6.2.10.bin

  kickstart compile time:  10/9/2014 12:00:00 [10/17/2014 05:45:38]

  system image file is:    bootflash:///n7000-s2-dk9.6.2.10.bin

  system compile time:     10/9/2014 12:00:00 [10/17/2014 07:39:33]

 

Inventory:

 

Extender: N2K-C2248TP-E-1GE

Sup: N7K-SUP2

Line card: N7K-F248XP-25E

Line card: N7K-M148GT-11L

 

sh int eth 101/1/25

Ethernet101/1/25 is up

admin state is up

  Hardware: 10/100/1000 Ethernet, address: 381c.1a4e.9c1a (bia 381c.1a4e.9c1a)

  Description: HOST_JUMBOFRAME

  MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec

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

  Encapsulation ARPA, medium is broadcast

  Port mode is access

  full-duplex, 1000 Mb/s

  Beacon is turned off

  Auto-Negotiation is turned on

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

  Auto-mdix is turned off

  Switchport monitor is off

  EtherType is 0x8100

  Last link flapped 4d04h

  Last clearing of "show interface" counters never

  2 interface resets

  Load-Interval #1: 30 seconds

    30 seconds input rate 2272 bits/sec, 2 packets/sec

    30 seconds output rate 3792 bits/sec, 5 packets/sec

    input rate 2.27 Kbps, 2 pps; output rate 3.79 Kbps, 5 pps

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

    300 seconds input rate 2320 bits/sec, 2 packets/sec

    300 seconds output rate 8024 bits/sec, 5 packets/sec

    input rate 2.32 Kbps, 2 pps; output rate 8.02 Kbps, 5 pps

  RX

    45202352 unicast packets  251361 multicast packets  26468 broadcast packets

    45480181 input packets  4579615386 bytes

    0 jumbo packets  0 storm suppression packets

    0 runts  0 giants  0 CRC/FCS  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

    70952311 unicast packets  6623444 multicast packets  2358644 broadcast packets

    79934399 output packets  14678302804 bytes

    0 jumbo packets

    0 output error  0 collision  0 deferred  0 late collision

    0 lost carrier  0 no carrier  0 babble  0 output discard

    0 Tx pause

 

Configuration of connection to extender:

 

interface port-channel101

  switchport

  switchport mode fex-fabric

  fex associate 101

  mtu 9216

 

interface Ethernet3/1

  description Extender 101

  switchport mode fex-fabric

  fex associate 101

  mtu 9216

  channel-group 101

  no shutdown

 

Host port configuration (on extender):

interface Ethernet101/1/25

  description HOST_JUMBOFRAME

  switchport access vlan 160

  spanning-tree port type edge

  flowcontrol receive on (disabling flowcontrol don't change enything)

  no shutdown

 

System MTU confgiruation:

 

system jumbomtu 9216

 

 

 

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