Hello!
I found strange cycle in values "Total output drops" on one of 3750 GE ports (ios c3750-advipservicesk9-mz.122-40.SE).
Values goes in next cycle: 0, 407, 814, 4294966889. But the port/controller/cable have no any physical or logical errors.
Port connected to server with ethernet card Intel(R) PRO/1000 EB Network Connection with I/O Acceleration.
From server side - no errors/drops/etc.
Port configuration:
!
interface GigabitEthernet2/0/9
description * it-hrk1-1 *
switchport access vlan 11
switchport mode access
no cdp enable
spanning-tree portfast
spanning-tree bpdufilter enable
!
Sample output of switch port statistics:
GigabitEthernet2/0/9 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0018.ba11.6c89 (bia 0018.ba11.6c89)
Description: * it-hrk1-1 *
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 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:08, output hang never
Last clearing of "show interface" counters 00:07:16
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4294966482
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 3000 bits/sec, 2 packets/sec
5 minute output rate 133000 bits/sec, 62 packets/sec
4270 packets input, 336781 bytes, 0 no buffer
Received 15 broadcasts (0 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
33299 packets output, 8137577 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
This cycle present at only one port. On the other ports connected servers with same ethernet cards.
Does anyone have idea what it can be? And why?