12-08-2019 09:56 AM - edited 12-08-2019 10:19 AM
I'm seeing output drops, but I don't see any apparent issue. Looks like it's increasing by 10 - 15 packets per second. The interface is connected to a gig Ethernet link.
SWITCH-2960G#sh int gi0/9
GigabitEthernet0/9 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 64d9.895e.4389 (bia 64d9.895e.4389)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 62/255, rxload 62/255
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 00:00:13, output 00:00:00, output hang never
Last clearing of "show interface" counters 19:25:54
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5597
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 246471000 bits/sec, 26253 packets/sec
30 second output rate 246767000 bits/sec, 26279 packets/sec
199181745 packets input, 163153601557 bytes, 0 no buffer
Received 767965 broadcasts (705093 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 705093 multicast, 0 pause input
0 input packets with dribble condition detected
119496823 packets output, 122753976025 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
SWITCH-2960G#
SWITCH-2960G#sh buffers | i no[ ]memory
0 failures (0 no memory)
0 failures (0 no memory)
0 failures (0 no memory)
0 failures (0 no memory)
0 failures (0 no memory)
0 failures (0 no memory)
0 failures (0 no memory)
0 failures (0 no memory)
SWITCH-2960G#
This is a 2960G switch with 32 Gbps of switching fabric, so capacity shouldn't be an issue passing 250 Mbps in each direction over this port, right?
12-08-2019 12:26 PM
30 second input rate 246471000 bits/sec, 26253 packets/sec
30 second output rate 246767000 bits/sec, 26279 packets/sec
It is 245 Mbps. So, the number of output drops are very small (5597). If it is not causing any application issues, you should be fine.
HTH
12-08-2019 02:25 PM
12-08-2019 03:02 PM
Ah, okay. Are there any practical ways to detect them?
12-08-2019 05:37 PM
You can try and SPAN the port and connect a Wireshark to another port on the switch and analyze the data you capture.
HTH
12-08-2019 07:49 PM
Sure, I can do that. What should I be on the lookout for in the captured data?
12-09-2019 06:27 AM
You would have to create a filter in Wireshark to look for drop frames, re-transmission, etc..
You can start with this link:
https://www.comparitech.com/net-admin/how-to-use-wireshark/#How_to_Capture_Data_Packets
HTH
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