packets discards in 10G Leaf

[rubberheart]

we noticed there are lots of packets discarded in some 10G ports which connected to our 10G Leaf

not sure how to TS this issue. thanks a lot !!

Ethernet1/13 is up

admin state is up, Dedicated Interface

  Hardware: 1000/10000 Ethernet, address: a46c.2a1d.c587 (bia a46c.2a1d.c587)

  MTU 9000 bytes, BW 10000000 Kbit, DLY 1 usec

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

  Encapsulation ARPA, medium is broadcast

  Port mode is trunk

  full-duplex, 10 Gb/s, media type is 10G

  FEC (forward-error-correction) : disable-fec

  Beacon is turned off

  Auto-Negotiation is turned on

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

  Auto-mdix is turned off

  Rate mode is dedicated

  Switchport monitor is off

  EtherType is 0x8100

  EEE (efficient-ethernet) : n/a

  Last link flapped 04w28d

  Last clearing of "show interface" counters never

  1 interface resets

  30 seconds input rate 5418832 bits/sec, 1326 packets/sec

  30 seconds output rate 4554760 bits/sec, 1320 packets/sec

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

    input rate 4796048 bps, 1319 pps; output rate 4665008 bps, 1373 pps

  RX

    91803758440 unicast packets  492259 multicast packets  152104 broadcast packets

    91804402803 input packets  135785715600549 bytes

    0 jumbo packets  0 storm suppression bytes

    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  46 input discard

    0 Rx pause

  TX

    36985401243 unicast packets  9665446 multicast packets  9824141 broadcast packets

    37004890830 output packets  5799051470487 bytes

    0 jumbo packets

    0 output error  0 collision  0 deferred  0 late collision

    0 lost carrier  0 no carrier  0 babble  6164408 output discard

    0 Tx pause

[dpita]

Hello

Thanks for using SupportForums!

What is connected on the other side of that port? 

If I'm not mistaken, sometimes we see input discards if its an L2 switch on the other side sending floods or something for a VLAN that ACI is not trunking. 

[rubberheart]

Thanks Dpita, 

I have confirmed with the server team , both side are trunked and all vlan tagging are normal.

we dont see ant packets drops in those vlans.

show logging ip access-list internal packet-log deny

[ Wed Jun 15 02:49:23 2016 382584 usecs]: Start of deny-log trace

the attachment is the numbers of discards on those interface ,, 13--VIO1,, 14--VIO2, 15--VIO3

looks like all of them are dropping the same amount of packets.

dont know what kind of packets get dropped , any idea? Thanks

[zeeshan.rommel]

Hi rubberheart

 the attachment.. is it from ACI GUI? if yes where can i find it in the GUI

Regards

Zeeshan

[rubberheart]

it is not from ACI GUI , we enabled the snmp in ACI , this is the snmp server (Solarwinds) GUI. 

[zeeshan.rommel]

snmp here OneClick is loggin this incident "Description - Packet Discard rate > 5%" from one of the leaf.. no port information is there.. i dont know where to look

[mohanadbarahim]

any resolution for this issue. We only see it in 1st Gen Leaf.

Regard,

B

[mohanadbarahim]

Are you able to resolve the issue, this kind of behavior you can see only with L2 switches connected to 1st Generation leaf? Please update me if you resolve this issue. What type of leaf are using

[julian.bendix]

Hey!

As far as I know, if you are running an ACI release lower than 5.0,
then Traffic that is punted (sent to the CPU of the Switch, like Management Traffic) is also counted as Output Discard/Drop.

This can be seen as "Strom Drops" in the detailed view of the interface counters.

In your example output, on the interface Eth 1/13,.. could you share the output from the following command on the same switch?

vsh_lc -c "show platform int counters port 13"

Thanks and br

Juls

[mohanadbarahim]

Hi Julis, 

We are talking about two different issues, our leaves 1st Gen connected L2 switches and we are observing input/output discard. 

from the command, you provided the following output showing zero Strom drops.

vsh_lc -c "show platform int counters port 43"
Initializing Module.
Stats for port 43
IF LPort Input Output
Packets Bytes Packets Bytes
eth-1/43 43 Total 852112 83145878 435682253 259564962972
Unicast 82255 21537802 418496365 258170793683
Multicast 725522 51964992 14933788 1158017906
Flood 0 0
UnknownUC 0 0
Unclass 126591 9640534
Total Drops 841762 180274
Storm Drops(Bytes) 0

[julian.bendix]

Okay i see.

Does that happen on multiple switches and multiple ports, or only on specific switches and specific ports?

Thanks and br
Juls

[mohanadbarahim]

only on specific switches 1st gen Switches