Catalyst 3850 high Total output drops and output errors

[vaishalipal]

total output drops 0 but still output rate is less than input rate, where are these packets getting lost??

show interfaces gigabitEthernet 2
GigabitEthernet2 is up, line protocol is up
Hardware is CSR vNIC, address is 0050.568b.4a6b (bia 0050.568b.4a6b)
Internet address is 1.1.1.1/24
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full Duplex, 1000Mbps, link type is auto, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:07:35, output 00:00:27, output hang never
Last clearing of "show interface" counters never
Input queue: 0/230000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/230000 (size/max)
5 minute input rate 396000 bits/sec, 803 packets/sec
5 minute output rate 48000 bits/sec, 112 packets/sec
452430 packets input, 27145800 bytes, 0 no buffer
Received 0 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
52094 packets output, 2813134 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
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

[Georg Pauwen]

Hello,

the input/output rates are averages calculated over the length of the load interval, which by default is 300 seconds. If you change that value (e.g. load-interval 30) on the interface, these values will change also. A discrepancy does not mean there are dropped packets.

[Giuseppe Larosa]

Hello Vaishalipal,

the output that you have provided does not show any type of errors in input/ouput direction for the specified interface.

Generally speaking, asymmetry in use of an interface in input/output direction is normal for ports connecting to servers or to routers. More traffic is sent by a server to customer direction and routers can have different interface to route the packets (it can be a case of so called asymmetric routing).

Input and ouput rates and counters should be the same only if the only traffic on the interface are ICMP pings between directly connected devices.

Hope to help

Giuseppe