[c-nsp] 3750ME FastE TXqueue buffer size

Clinton Work clinton at scripty.com
Fri Nov 20 18:09:36 EST 2015


I have a problem with a 3750ME - IOS 12.2(25)SEG1 where traffic is
entering via Gi1/1/1 and exiting via F1/0/1.  The customer is reporting
1-2% packet loss when they ramp up traffic thru their F1/0/1 access
port.   There are incrementing TXQueue drops on the F1/0/1 port and I
suspect that the TXqueue drops are due to micro-bursting.  Can anybody
tell me how large the TXQueue buffers are on the 3750ME FastE ports?   I
have a TAC case open, but the case engineer doesn't have an answer yet.  

3750ME#show platform port-asic stats drop Fa1/0/1

  Interface Fa1/0/1 TxQueue Drop Statistics
    Queue 0
      Weight 0 Frames 0
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 1
      Weight 0 Frames 741835304
      Weight 1 Frames 26
      Weight 2 Frames 0
    Queue 2
      Weight 0 Frames 16297527
      Weight 1 Frames 0
      Weight 2 Frames 0
    Queue 3
      Weight 0 Frames 7558847
      Weight 1 Frames 0
      Weight 2 Frames 0

3750ME# show interfaces f1/0/1
FastEthernet1/0/1 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0019.0690.9d03 (bia
  0019.0690.9d03)
  Description: <removed>
  MTU 1546 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 7/255, rxload 4/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 3d23h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 1808000 bits/sec, 755 packets/sec
  30 second output rate 2868000 bits/sec, 795 packets/sec
     526535301 packets input, 1789598187 bytes, 0 no buffer
     Received 3446056 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 575902 multicast, 0 pause input
     0 input packets with dribble condition detected
     546640751 packets output, 2637257828 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     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



-- 
Clinton Work
Airdrie, AB


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