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