Nexus 7K input discards

Sarg . · ‎08-20-2014

Hello Team,

I seeing a number of discards on my Nexus 7K . Does anyone know how I can find out the packets that are being discarded?

Please see the output below.

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

Ethernet3/48 is up

admin state is up, Dedicated Interface

Belongs to Po1

Hardware: 1000/10000 Ethernet, address:

Description: Link to Telecity

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

reliability 255/255, txload 1/255, rxload 2/255

Encapsulation ARPA, medium is broadcast

Port mode is trunk

full-duplex, 1000 Mb/s, media type is 1G

Beacon is turned off

Auto-Negotiation is turned on

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

Auto-mdix is turned on

Rate mode is dedicated

Switchport monitor is off

EtherType is 0x8100

EEE (efficient-ethernet) : n/a

Last link flapped 10week(s) 6day(s)

Last clearing of "show interface" counters never

5 interface resets

30 seconds input rate 10881600 bits/sec, 2477 packets/sec

30 seconds output rate 2799184 bits/sec, 1433 packets/sec

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

input rate 19.29 Mbps, 3.28 Kpps; output rate 4.57 Mbps, 1.74 Kpps

RX

60230024284 unicast packets 76060691 multicast packets 44682833 broadcast packets

60350739048 input packets 66908411765118 bytes

0 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 332770 input discard

0 Rx pause

TX

66422484197 unicast packets 64002660 multicast packets 21560447 broadcast packets

66508013619 output packets 65774916044117 bytes

0 jumbo packets

0 output error 0 collision 0 deferred 0 late collision

0 lost carrier 0 no carrier 0 babble 288477 output discard

0 Tx pause

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Akash Agrawal · ‎08-20-2014

Hi,

Please check output of command " show hardware internal interface indiscard-stats front-port x "

Support for Granular Input Packet Discards Information

Beginning with Cisco NX-OS Release 5.0(3)U2(1), you can get a more detailed information on what specific condition led to an input discard on a given interface. Use the show hardware internal interface indiscard-stats front-port x command to determine the condition that could be potentially responsible for the input discards that are seen on port eth1/x. The switch output shows the discards for IPv4, STP, input policy, ACL specific discard, generic receive drop, and VLAN related discards.

Use the show hardware internal interface indiscard-stats front-port x command to determine the condition that could be potentially responsible for the input discards.

Sarg . · ‎08-21-2014

Here are the versions that I am using below but that command is not active on my 7K.

Software
BIOS: version 2.12.0
kickstart: version 6.1(4a)
system: version 6.1(4a)
BIOS compile time: 05/29/2013
kickstart image file is: bootflash:///n7000-s2-kickstart.6.1.4a.bin
kickstart compile time: 12/25/2020 12:00:00 [09/26/2013 07:22:01]
system image file is: bootflash:///n7000-s2-dk9.6.1.4a.bin
system compile time: 7/8/2013 19:00:00 [09/26/2013 09:08:40]

Hardware
cisco Nexus7000 C7004 (4 Slot) Chassis ("Supervisor module-2")
Intel(R) Xeon(R) CPU with 12225160 kB of memory.

Akash Agrawal · ‎08-21-2014

Hi,

Sorry, by mistake i provided command for Nexus 3000, while you have Nexus 7000. Can you please provide running config for interface where input discard is increasing and other side where it is connected. Sometimes it happens due to vlan mismatch, you are receiving traffic with vlan tagged which is not passed on received interface.

Below commands may also help you

show interface ethernet <x/x>
show interface ethernet <x/x> counters detailed all
show hardware internal errors module <slot No of the vpc member port>
show hardware internal statistics pktflow dropped
show interface ethernet <x/x> counters errors

-Akash