Cover by Gary A. Donahue

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Monitoring QoS

You monitor queues primarily through a couple of simple commands. The output of these commands contains a lot of information, so I’ll explain what you need to look for. First, run the show interface command:

R1#sho int s0/1
Serial0/1 is up, line protocol is up
  Hardware is PQUICC with Fractional T1 CSU/DSU
  Internet address is 192.168.1.1/24
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 21/255, rxload 22/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 5d04h
  Input queue: 2/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/4/256 (active/max active/max total)
     Reserved Conversations 2/2 (allocated/max allocated)
     Available Bandwidth 1030 kilobits/sec
  5 minute input rate 134000 bits/sec, 53 packets/sec
  5 minute output rate 131000 bits/sec, 53 packets/sec
     22874566 packets input, 2838065420 bytes, 0 no buffer
     Received 52348 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     22964396 packets output, 2678320888 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

The output indicates that the queuing strategy is weighted fair. We’re using low-latency ...

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