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Generally it's caused by sending packets to the interface faster than they can egress the interface.
On some switches, I think the 2960 being one of them, QoS being enabled on the switch, in a default configuration, often results in premature packet dropping due to default buffer reservations for QoS egress queues.
I have checked the global configuration but no QOS settings are enabled.
The output drops are not really high but i still have them.
This morning i reset the counters and now i have again "output drops: 2956"
it is just an interface connected to a computer so it is strange that it has the output drops.
FastEthernet0/2 is up, line protocol is up (connected) Hardware is Fast Ethernet, address is a456.308c.3102 (bia a456.308c.3102) MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 12/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:00, output hang never Last clearing of "show interface" counters 05:19:54 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2956 Queueing strategy: fifo Output queue: 0/0 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 4829000 bits/sec, 861 packets/sec 10314 packets input, 1015389 bytes, 0 no buffer Received 1674 broadcasts (1373 multicasts)
Fa0/2 connected 30 a-full a-100 10/100BaseTX
sh mac add int fa0/2 Mac Address Table -------------------------------------------
Vlan Mac Address Type Ports ---- ----------- -------- ----- 30 0010.f325.e554 DYNAMIC Fa0/2 Total Mac Addresses for this criterion: 1
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