[c-nsp] Troubelshooting Output Drops on 7301

[Andy Saykao]

Hi All,
 
We're seeing some output drops occur on one of our interstate links.
Just wondering how I can track what's causing it and/or whether it's
normal behaviour for the output queue to fill up every now and then
because of an increase in bursty traffic at the time. 
 
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
11624 (Counters were cleared 17 minutes ago.)
 
I've read Cisco's "Troubleshooting Input Queue Drops and Output Queue
Drops" but it doesn't seem to have any information relating to my
situation. Also searched for help on the list but nothing much to go on.
 
Cisco IOS Software, 7301 Software (C7301-JS-M), Version 12.2(31)SB13,
RELEASE SOFTWARE (fc1)
Cisco 7301 (NPE) processor (revision A) with 229376K/32768K bytes of
memory.
 
interface GigabitEthernet0/2
 description Link from XXX to YYY
 mtu 9000
 bandwidth 150000
 ip address 203.17.96.X 255.255.255.252
 load-interval 30
 media-type gbic
 speed auto
 duplex auto
 negotiation auto
 mpls ip
 
router>sh int gig 0/2
GigabitEthernet0/2 is up, line protocol is up 
  Hardware is BCM1250 Internal MAC, address is 000b.60a5.ac19 (bia
000b.60a5.ac19)
  Description: Link from XXX to YYY
  Internet address is 203.17.96.X/30
  MTU 9000 bytes, BW 150000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 221/255, rxload 153/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1000Mbps, 1000BaseLX, Auto-negotiation, media type is LX
  output flow-control is XON, input flow-control is XON
  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 00:17:33
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:
11624
Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 90511000 bits/sec, 17280 packets/sec
  30 second output rate 130521000 bits/sec, 21551 packets/sec
     18784789 packets input, 3852868380 bytes, 0 no buffer
     Received 1244 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 66127 multicast, 0 pause input
     22942732 packets output, 4128502155 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
 
router#sh proc memory
Processor Pool Total:  174234996 Used:   64120552 Free:  110114444
      I/O Pool Total:   33554432 Used:    3729248 Free:   29825184
 
router#sh processes cpu sorted
CPU utilization for five seconds: 20%/18%; one minute: 19%; five
minutes: 19%
 
Any help would be appreciated.
 
Thanks.
 
Andy

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