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5901
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Output drop

salemmahara
Level 3
Level 3

Hello everybody

We have a couple of 3850 (Stacked) and we use it in our aggregation layer.

ports on this switches are bundled in port-channels to downstream switches

More than half of port are free(not connected for future).

As you know, 3850 series are really powerful and meanwhile when you stack them, their capabilities will increase.

but here are an output of one of port-channel interfaces which looks really strange:

https://pitstop.manageengine.com/portal/community/topic/report-and-print-problems

  Hardware is EtherChannel, address is ---------- (bia -------------)
  MTU 1500 bytes, BW 2000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is
  input flow-control is off, output flow-control is unsupported
  Members in this channel: Gi1/0/24 Gi2/0/24
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:13:28, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 562303015
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 153000 bits/sec, 134 packets/sec
  5 minute output rate 2330000 bits/sec, 325 packets/sec
     127201005 packets input, 44246365237 bytes, 0 no buffer
     Received 1266947 broadcasts (903818 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 903818 multicast, 0 pause input
     0 input packets with dribble condition detected
     380610888 packets output, 410883103982 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

 

Its IOS EX is almost updated (3.6). no buffer failures, no error or ,,,, but Output drop. this interfaces are 1G but their utilization is at most 30% ant lower. some of them utilize even under 10% . Switches are stacked and most of their interfaces are not connected so there isn't any limitation in buffer or ...

31 Replies 31

Dear @romanroma

My Fiber links connected to 3850 uplink module are working fine without any output drop. They're working at 10G speed.

 

Have you changed the transceivers? 

Hello @romanroma Hello everybody I decided to bring the topic up after a while to know if there is another solution or not?
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