Input queue drops on 6724-sfp

Unanswered Question
Jul 8th, 2010

Hi all,

I'm having a bit of a problem on an etherchannel between 2 6509-Es running 6724 cards.  I'm seeing input drops under light traffic on both member physical interfaces (gig-E 1000-SX), but no indication of physical errors.  There is currently no QoS configuration on either switch.  All member ports on both switches are configured as trunks, PaGP desirable non-silent.   All cards are almost empty, so no concern of oversubscription.

Thanks in advance.

Port stats:

GigabitEthernet7/12 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 0017.951a.8777 (bia 0017.951a.8777)
  Description: tcoc306sw_x-connect
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 2/255, rxload 5/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is SX
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:10, output 00:00:02, output hang never
  Last clearing of "show interface" counters 5w0d
  Input queue: 0/2000/15812289/0 (size/max/drops/flushes); Total output drops: 5125
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 23010000 bits/sec, 5950 packets/sec
  5 minute output rate 8865000 bits/sec, 3592 packets/sec
     43998796840 packets input, 51574357321403 bytes, 0 no buffer
     Received 30664501 broadcasts (20257426 multicasts)
     0 runts, 0 giants, 0 throttles
     15812289 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     26494177579 packets output, 5677668788511 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

GigabitEthernet8/12 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 000a.b80f.7c1b (bia 000a.b80f.7c1b)
  Description: tcoc306sw_x-connect
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 6/255, rxload 6/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is SX
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:04, output 00:00:20, output hang never
  Last clearing of "show interface" counters 5w0d
  Input queue: 0/2000/3003701/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 26846000 bits/sec, 7646 packets/sec
  5 minute output rate 26321000 bits/sec, 6767 packets/sec
     82049890984 packets input, 85974421941108 bytes, 0 no buffer
     Received 26645426 broadcasts (18924453 multicasts)
     0 runts, 0 giants, 0 throttles
     3003701 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     55504334005 packets output, 17651416231314 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

sh counters interface gi7/12
64 bit counters:
0.                      rxHCTotalPkts = 867576310336
1.                      txHCTotalPkts = 498927272774
2.                    rxHCUnicastPkts = 866895165652
3.                    txHCUnicastPkts = 497236583163
4.                  rxHCMulticastPkts = 353583254
5.                  txHCMulticastPkts = 876450873
6.                  rxHCBroadcastPkts = 327561430
7.                  txHCBroadcastPkts = 814238738
8.                         rxHCOctets = 1118144527979616
9.                         txHCOctets = 85926341406063
10.                 rxTxHCPkts64Octets = 7781095
11.            rxTxHCPkts65to127Octets = 492815865646
12.           rxTxHCPkts128to255Octets = 45334962366
13.           rxTxHCPkts256to511Octets = 23896526068
14.          rxTxHCpkts512to1023Octets = 81964975357
15.         rxTxHCpkts1024to1518Octets = 19347451021
16.                    txHCTrunkFrames = 498895208820
17.                    rxHCTrunkFrames = 867564826247
18.                     rxHCDropEvents = 0

32 bit counters:
0.                   rxCRCAlignErrors = 0
1.                   rxUndersizedPkts = 0
2.                    rxOversizedPkts = 0
3.                     rxFragmentPkts = 0
4.                          rxJabbers = 0
5.                       txCollisions = 0
6.                         ifInErrors = 80881303
7.                        ifOutErrors = 0
8.                       ifInDiscards = 80881534
9.                  ifInUnknownProtos = 0
10.                      ifOutDiscards = 53062
11.            txDelayExceededDiscards = 0
12.                              txCRC = 0
13.                         linkChange = 15
14.                   wrongEncapFrames = 0
All Port Counters
1.                          InPackets = 867576285687
2.                           InOctets = 1118144515582115
3.                        InUcastPkts = 866895141041
4.                        InMcastPkts = 353583229
5.                        InBcastPkts = 327561418
6.                         OutPackets = 498927258925
7.                          OutOctets = 85926337523697
8.                       OutUcastPkts = 497236569479
9.                       OutMcastPkts = 876450769
10.                       OutBcastPkts = 814238677
11.                           AlignErr = 0
12.                             FCSErr = 0
13.                            XmitErr = 0
14.                             RcvErr = 80881274
15.                          UnderSize = 0
16.                          SingleCol = 0
17.                           MultiCol = 0
18.                            LateCol = 0
19.                       ExcessiveCol = 0
20.                       CarrierSense = 0
21.                              Runts = 0
22.                             Giants = 0
23.                         InDiscards = 80881505
24.                        OutDiscards = 53062
25.                           InErrors = 80881274
26.                          OutErrors = 0
27.                    InUnknownProtos = 0
28.                              txCRC = 0
29.                      TrunkFramesTx = 498895194974
30.                      TrunkFramesRx = 867564801600
31.                         WrongEncap = 0
32.     Broadcast_suppression_discards = 0
33.     Multicast_suppression_discards = 0
34.       Unicast_suppression_discards = 0
35.                 rxTxHCPkts64Octets = 7781095
36.            rxTxHCPkts65to127Octets = 492815845997
37.           rxTxHCPkts128to255Octets = 45334957435
38.           rxTxHCPkts256to511Octets = 23896523964
39.          rxTxHCpkts512to1023Octets = 81964969945
40.         rxTxHCpkts1024to1518Octets = 19347449413
41.                         DropEvents = 0
42.                     CRCAlignErrors = 0
43.                     UndersizedPkts = 0
44.                      OversizedPkts = 0
45.                       FragmentPkts = 0
46.                            Jabbers = 0
47.                         Collisions = 0
48.              DelayExceededDiscards = 0
49.                        bpduOutlost = 0
50.                        qos0Outlost = 53062
51.                        qos1Outlost = 0
52.                        qos2Outlost = 0
53.                        qos3Outlost = 0
54.                        qos4Outlost = 0
55.                        qos5Outlost = 0
56.                        qos6Outlost = 0
57.                        qos7Outlost = 0
58.                        qos8Outlost = 0
59.                        qos9Outlost = 0
60.                       qos10Outlost = 0
61.                       qos11Outlost = 0
62.                       qos12Outlost = 0
63.                       qos13Outlost = 0
64.                       qos14Outlost = 0
65.                       qos15Outlost = 0
66.                       qos16Outlost = 0
67.                       qos17Outlost = 0
68.                       qos18Outlost = 0
69.                       qos19Outlost = 0
70.                       qos20Outlost = 0
71.                       qos21Outlost = 0
72.                       qos22Outlost = 0
73.                       qos23Outlost = 0
74.                       qos24Outlost = 0
75.                       qos25Outlost = 0
76.                       qos26Outlost = 0
77.                       qos27Outlost = 0
78.                       qos28Outlost = 0
79.                       qos29Outlost = 0
80.                       qos30Outlost = 0
81.                       qos31Outlost = 0
82.                    bpduCbicOutlost = 0
83.                    qos0CbicOutlost = 0
84.                    qos1CbicOutlost = 0
85.                    qos2CbicOutlost = 0
86.                    qos3CbicOutlost = 0
87.                         bpduInlost = 0
88.                         qos0Inlost = 231
89.                         qos1Inlost = 0
90.                         qos2Inlost = 0
91.                         qos3Inlost = 0
92.                         qos4Inlost = 0
93.                         qos5Inlost = 0
94.                         qos6Inlost = 0
95.                         qos7Inlost = 0
96.                         qos8Inlost = 0
97.                         qos9Inlost = 0
98.                        qos10Inlost = 0
99.                        qos11Inlost = 0
100.                        qos12Inlost = 0
101.                        qos13Inlost = 0
102.                        qos14Inlost = 0
103.                        qos15Inlost = 0
104.                         pqueInlost = 0
105.                           Overruns = 231
106.                           maxIndex = 0

sh counters interface gigabitEthernet 8/12
64 bit counters:
0.                      rxHCTotalPkts = 1213606943374
1.                      txHCTotalPkts = 733791352817
2.                    rxHCUnicastPkts = 1213173514243
3.                    txHCUnicastPkts = 732826466170
4.                  rxHCMulticastPkts = 273391150
5.                  txHCMulticastPkts = 291887309
6.                  rxHCBroadcastPkts = 160037981
7.                  txHCBroadcastPkts = 672999338
8.                         rxHCOctets = 1424144487110281
9.                         txHCOctets = 161607128944496
10.                 rxTxHCPkts64Octets = 7781089
11.            rxTxHCPkts65to127Octets = 693796116218
12.           rxTxHCPkts128to255Octets = 73358612288
13.           rxTxHCPkts256to511Octets = 40325855641
14.          rxTxHCpkts512to1023Octets = 247507695487
15.         rxTxHCpkts1024to1518Octets = 27460113820
16.                    txHCTrunkFrames = 733779741790
17.                    rxHCTrunkFrames = 1213595460082
18.                     rxHCDropEvents = 0

32 bit counters:
0.                   rxCRCAlignErrors = 0
1.                   rxUndersizedPkts = 0
2.                    rxOversizedPkts = 4
3.                     rxFragmentPkts = 0
4.                          rxJabbers = 0
5.                       txCollisions = 0
6.                         ifInErrors = 87834034
7.                        ifOutErrors = 0
8.                       ifInDiscards = 87834242
9.                  ifInUnknownProtos = 0
10.                      ifOutDiscards = 11861
11.            txDelayExceededDiscards = 0
12.                              txCRC = 0
13.                         linkChange = 15
14.                   wrongEncapFrames = 0
All Port Counters
1.                          InPackets = 1213606899367
2.                           InOctets = 1424144462940324
3.                        InUcastPkts = 1213173470278
4.                        InMcastPkts = 273391114
5.                        InBcastPkts = 160037975
6.                         OutPackets = 733791316379
7.                          OutOctets = 161607109991137
8.                       OutUcastPkts = 732826429860
9.                       OutMcastPkts = 291887278
10.                       OutBcastPkts = 672999241
11.                           AlignErr = 0
12.                             FCSErr = 0
13.                            XmitErr = 0
14.                             RcvErr = 87834033
15.                          UnderSize = 0
16.                          SingleCol = 0
17.                           MultiCol = 0
18.                            LateCol = 0
19.                       ExcessiveCol = 0
20.                       CarrierSense = 0
21.                              Runts = 0
22.                             Giants = 4
23.                         InDiscards = 87834241
24.                        OutDiscards = 11861
25.                           InErrors = 87834033
26.                          OutErrors = 0
27.                    InUnknownProtos = 0
28.                              txCRC = 0
29.                      TrunkFramesTx = 733779705353
30.                      TrunkFramesRx = 1213595416076
31.                         WrongEncap = 0
32.     Broadcast_suppression_discards = 0
33.     Multicast_suppression_discards = 0
34.       Unicast_suppression_discards = 0
35.                 rxTxHCPkts64Octets = 7781088
36.            rxTxHCPkts65to127Octets = 693796084421
37.           rxTxHCPkts128to255Octets = 73358597678
38.           rxTxHCPkts256to511Octets = 40325853179
39.          rxTxHCpkts512to1023Octets = 247507683606
40.         rxTxHCpkts1024to1518Octets = 27460111138
41.                         DropEvents = 0
42.                     CRCAlignErrors = 0
43.                     UndersizedPkts = 0
44.                      OversizedPkts = 4
45.                       FragmentPkts = 0
46.                            Jabbers = 0
47.                         Collisions = 0
48.              DelayExceededDiscards = 0
49.                        bpduOutlost = 0
50.                        qos0Outlost = 11861
51.                        qos1Outlost = 0
52.                        qos2Outlost = 0
53.                        qos3Outlost = 0
54.                        qos4Outlost = 0
55.                        qos5Outlost = 0
56.                        qos6Outlost = 0
57.                        qos7Outlost = 0
58.                        qos8Outlost = 0
59.                        qos9Outlost = 0
60.                       qos10Outlost = 0
61.                       qos11Outlost = 0
62.                       qos12Outlost = 0
63.                       qos13Outlost = 0
64.                       qos14Outlost = 0
65.                       qos15Outlost = 0
66.                       qos16Outlost = 0
67.                       qos17Outlost = 0
68.                       qos18Outlost = 0
69.                       qos19Outlost = 0
70.                       qos20Outlost = 0
71.                       qos21Outlost = 0
72.                       qos22Outlost = 0
73.                       qos23Outlost = 0
74.                       qos24Outlost = 0
75.                       qos25Outlost = 0
76.                       qos26Outlost = 0
77.                       qos27Outlost = 0
78.                       qos28Outlost = 0
79.                       qos29Outlost = 0
80.                       qos30Outlost = 0
81.                       qos31Outlost = 0
82.                    bpduCbicOutlost = 0
83.                    qos0CbicOutlost = 0
84.                    qos1CbicOutlost = 0
85.                    qos2CbicOutlost = 0
86.                    qos3CbicOutlost = 0
87.                         bpduInlost = 0
88.                         qos0Inlost = 208
89.                         qos1Inlost = 0
90.                         qos2Inlost = 0
91.                         qos3Inlost = 0
92.                         qos4Inlost = 0
93.                         qos5Inlost = 0
94.                         qos6Inlost = 0
95.                         qos7Inlost = 0
96.                         qos8Inlost = 0
97.                         qos9Inlost = 0
98.                        qos10Inlost = 0
99.                        qos11Inlost = 0
100.                        qos12Inlost = 0
101.                        qos13Inlost = 0
102.                        qos14Inlost = 0
103.                        qos15Inlost = 0
104.                         pqueInlost = 0
105.                           Overruns = 208
106.                           maxIndex = 0

I have this problem too.
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Leo Laohoo Thu, 07/08/2010 - 14:55

Awwwwwwwwwwww ... Don't worry about the input queues.  It's the least of your worries.  Have you seen amount of input errors accumulated in 5 weeks???

Have you tried changing the SFP modules and/or the patch cords?  What is the total end-to-end distance?

GigabitEthernet7/12 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 0017.951a.8777 (bia 0017.951a.8777)
  Description: tcoc306sw_x-connect
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 2/255, rxload 5/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is SX
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:10, output 00:00:02, output hang never
  Last clearing of "show interface" counters 5w0d
  Input queue: 0/2000/15812289/0 (size/max/drops/flushes); Total output drops: 5125
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 23010000 bits/sec, 5950 packets/sec
  5 minute output rate 8865000 bits/sec, 3592 packets/sec
     43998796840 packets input, 51574357321403 bytes, 0 no buffer
     Received 30664501 broadcasts (20257426 multicasts)
     0 runts, 0 giants, 0 throttles
     15812289 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     26494177579 packets output, 5677668788511 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



GigabitEthernet8/12 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 000a.b80f.7c1b (bia 000a.b80f.7c1b)
  Description: tcoc306sw_x-connect
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 6/255, rxload 6/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is SX
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:04, output 00:00:20, output hang never
  Last clearing of "show interface" counters 5w0d
  Input queue: 0/2000/3003701/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 26846000 bits/sec, 7646 packets/sec
  5 minute output rate 26321000 bits/sec, 6767 packets/sec
     82049890984 packets input, 85974421941108 bytes, 0 no buffer
     Received 26645426 broadcasts (18924453 multicasts)
     0 runts, 0 giants, 0 throttles
     3003701 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     55504334005 packets output, 17651416231314 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

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Posted July 8, 2010 at 10:01 AM
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