How to understand why a large error / discard packets at the port?
Cisco 3650:
interface GigabitEthernet1/0/11
switchport mode trunk
logging event trunk-status
logging event spanning-tree
logging event status
channel-group 10 mode on
spanning-tree portfast
#sh int gi1/0/11
GigabitEthernet1/0/11 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 74a2.e604.dc0b (bia 74a2.e604.dc0b)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 17/255, rxload 27/255
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 00:00:05, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2467174971
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 106682000 bits/sec, 12926 packets/sec
5 minute output rate 67463000 bits/sec, 13045 packets/sec
107462093550 packets input, 76077869418992 bytes, 0 no buffer
Received 339441301 broadcasts (339080654 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 339080654 multicast, 0 pause input
0 input packets with dribble condition detected
166101641755 packets output, 150601875113395 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
Cisco 3020:
interface GigabitEthernet0/17
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode on
GigabitEthernet0/17 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0019.e770.3191 (bia 0019.e770.3191)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 23/255, rxload 16/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, 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 00:00:16, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 63641000 bits/sec, 11640 packets/sec
5 minute output rate 91760000 bits/sec, 11685 packets/sec
3014944888 packets input, 4102678929 bytes, 0 no buffer
Received 11829905 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 11006140 multicast, 0 pause input
0 input packets with dribble condition detected
89217199 packets output, 2253604584 bytes, 0 underruns
0 output errors, 0 collisions, 3 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
