If you ever wondered if an interface has ever been over-run but the interface counters were cleared, well you can view this information.
This will show you the counters of the interface since the device was last rebooted. For this interface, if you look at line number 10 under "32 bit counters", you can see the interface has one been over-run. The same information is shown on line number 32 under "All Port Counters"
6509E#show counters interface gigabitEthernet 1/15
64 bit counters:
0. rxHCTotalPkts = 13773719463
1. txHCTotalPkts = 117546981006
2. rxHCUnicastPkts = 13770411834
3. txHCUnicastPkts = 27169023634
4. rxHCMulticastPkts = 3235868
5. txHCMulticastPkts = 90377957594
6. rxHCBroadcastPkts = 71761
7. txHCBroadcastPkts = 1
8. rxHCOctets = 964690246478
9. txHCOctets = 17121008138826
10. rxTxHCPkts64Octets = 122237854
11. rxTxHCPkts65to127Octets = 91633004621
12. rxTxHCPkts128to255Octets = 31194865790
13. rxTxHCPkts256to511Octets = 5836699039
14. rxTxHCpkts512to1023Octets = 1625307189
15. rxTxHCpkts1024to1518Octets = 908585976
16. txHCTrunkFrames = 0
17. rxHCTrunkFrames = 0
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 = 0
7. ifOutErrors = 0
8. ifInDiscards = 0
9. ifInUnknownProtos = 0
10. ifOutDiscards = 164487
11. txDelayExceededDiscards = 0
12. txCRC = 0
13. linkChange = 5
14. wrongEncapFrames = 0
All Port Counters
1. InPackets = 13773719462
2. InOctets = 964690246414
3. InUcastPkts = 13770411833
4. InMcastPkts = 3235868
5. InBcastPkts = 71761
6. OutPackets = 117546981005
7. OutOctets = 17121008138749
8. OutUcastPkts = 27169023633
9. OutMcastPkts = 90377957594
10. OutBcastPkts = 1
11. AlignErr = 0
12. FCSErr = 0
13. XmitErr = 0
14. RcvErr = 0
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 = 0
24. OutDiscards = 164487
25. InErrors = 0
26. OutErrors = 0
27. InUnknownProtos = 0
28. txCRC = 0
29. TrunkFramesTx = 0
30. TrunkFramesRx = 0
31. WrongEncap = 0
32. Broadcast_suppression_discards = 0
33. Multicast_suppression_discards = 0
34. Unicast_suppression_discards = 0
35. rxTxHCPkts64Octets = 122237853
36. rxTxHCPkts65to127Octets = 91633004620
37. rxTxHCPkts128to255Octets = 31194865790
38. rxTxHCPkts256to511Octets = 5836699039
39. rxTxHCpkts512to1023Octets = 1625307189
40. rxTxHCpkts1024to1518Octets = 908585976
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 = 164487
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 = 0
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. qos16Inlost = 0
105. qos17Inlost = 0
106. qos18Inlost = 0
107. qos19Inlost = 0
108. qos20Inlost = 0
109. qos21Inlost = 0
110. qos22Inlost = 0
111. qos23Inlost = 0
112. qos24Inlost = 0
113. qos25Inlost = 0
114. qos26Inlost = 0
115. qos27Inlost = 0
116. qos28Inlost = 0
117. qos29Inlost = 0
118. qos30Inlost = 0
119. qos31Inlost = 0
120. pqueInlost = 0
121. Overruns = 0
122. maxIndex = 0
This command will show you interface counters since they were last cleared. It even shows you when they were last cleared. To confirm this, I'm also including a show interface gigabitEthernet 1/15 which also has the last time the interface was cleared.
6509E#show counters interface gigabitEthernet 1/15 delta
Time since last clear
---------------------
11:50:29
64 bit counters:
0. rxHCTotalPkts = 15163
1. txHCTotalPkts = 10498
2. rxHCUnicastPkts = 8429
3. txHCUnicastPkts = 8346
4. rxHCMulticastPkts = 6734
5. txHCMulticastPkts = 2152
6. rxHCBroadcastPkts = 0
7. txHCBroadcastPkts = 0
8. rxHCOctets = 1037219
9. txHCOctets = 743295
10. rxTxHCPkts64Octets = 14372
11. rxTxHCPkts65to127Octets = 11289
12. rxTxHCPkts128to255Octets = 0
13. rxTxHCPkts256to511Octets = 0
14. rxTxHCpkts512to1023Octets = 0
15. rxTxHCpkts1024to1518Octets = 0
16. txHCTrunkFrames = 0
17. rxHCTrunkFrames = 0
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 = 0
7. ifOutErrors = 0
8. ifInDiscards = 0
9. ifInUnknownProtos = 0
10. ifOutDiscards = 0
11. txDelayExceededDiscards = 0
12. txCRC = 0
13. linkChange = 0
14. wrongEncapFrames = 0
All Port Counters
1. InPackets = 15159
2. InOctets = 1036963
3. InUcastPkts = 8428
4. InMcastPkts = 6731
5. InBcastPkts = 0
6. OutPackets = 10497
7. OutOctets = 743218
8. OutUcastPkts = 8345
9. OutMcastPkts = 2152
10. OutBcastPkts = 0
11. AlignErr = 0
12. FCSErr = 0
13. XmitErr = 0
14. RcvErr = 0
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 = 0
24. OutDiscards = 0
25. InErrors = 0
26. OutErrors = 0
27. InUnknownProtos = 0
28. txCRC = 0
29. TrunkFramesTx = 0
30. TrunkFramesRx = 0
31. WrongEncap = 0
32. Broadcast_suppression_discards = 0
33. Multicast_suppression_discards = 0
34. Unicast_suppression_discards = 0
35. rxTxHCPkts64Octets = 14368
36. rxTxHCPkts65to127Octets = 11288
37. rxTxHCPkts128to255Octets = 0
38. rxTxHCPkts256to511Octets = 0
39. rxTxHCpkts512to1023Octets = 0
40. rxTxHCpkts1024to1518Octets = 0
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 = 0
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 = 0
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. qos16Inlost = 0
105. qos17Inlost = 0
106. qos18Inlost = 0
107. qos19Inlost = 0
108. qos20Inlost = 0
109. qos21Inlost = 0
110. qos22Inlost = 0
111. qos23Inlost = 0
112. qos24Inlost = 0
113. qos25Inlost = 0
114. qos26Inlost = 0
115. qos27Inlost = 0
116. qos28Inlost = 0
117. qos29Inlost = 0
118. qos30Inlost = 0
119. qos31Inlost = 0
120. pqueInlost = 0
121. Overruns = 0
122. maxIndex = 0
6509E#show int gi 1/15
GigabitEthernet1/15 is up, line protocol is up (connected)
Hardware is C6k 1000Mb 802.3, address is 001c.f9d7.e400 (bia 001c.f9d7.e400)
Description: XXXXXXXXXXXXX
Internet address is X,X,X,X/30
MTU 1500 bytes, BW 1000000 Kbit, 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, media type is SX
input flow-control is off, output flow-control is on
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:04, output 00:00:04, output hang never
Last clearing of "show interface" counters 11:51:15
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
L2 Switched: ucast: 8437 pkt, 595439 bytes - mcast: 0 pkt, 0 bytes
L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast
L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes
15176 packets input, 1038132 bytes, 0 no buffer
Received 6738 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
10508 packets output, 743999 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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