We have a MPLS link connected to our 3850 with voice traffic, our interface have 1Gbps and the link is limited to 200Mbps. Our interface shows output drops, and the client device shows overruns.
What would be generating these drops and what can I do to avoid it?
3850#show run int g1/0/1
Building configuration...
Current configuration : 146 bytes
!
interface GigabitEthernet1/0/1
description ENLACE MPLS
switchport access vlan X
switchport mode access
speed 1000
duplex full
3850#show int g1/0/1
GigabitEthernet1/0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is f87b.208f.4d01 (bia f87b.208f.4d01)
Description: ENLACE MPLS
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 11/255, rxload 10/255
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 00:00:00, output hang never
Last clearing of "show interface" counters 20:57:38
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 62359
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 42056000 bits/sec, 23433 packets/sec
5 minute output rate 45959000 bits/sec, 24126 packets/sec
860048591 packets input, 189934625980 bytes, 0 no buffer
Received 842518 broadcasts (1521 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1521 multicast, 0 pause input
0 input packets with dribble condition detected
881783349 packets output, 209372802584 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
3850#show int vlan X
VlanX is up, line protocol is up
Hardware is Ethernet SVI, address is f87b.208f.4d45 (bia f87b.208f.4d45)
Description: GW-vlanX
Internet address is 192.168.160.1/24
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 33/255, rxload 42/255
Encapsulation ARPA, loopback not set
Keepalive not supported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 5/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 168164000 bits/sec, 91584 packets/sec
5 minute output rate 130720000 bits/sec, 70778 packets/sec
313589895385 packets input, 81224026060488 bytes, 32 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
245854847644 packets output, 60925586879564 bytes, 0 underruns
0 output errors, 2 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
clear counters gig1/0/1
and check back after a typical day of usage. Plus, your config shows no sign of MPLS, none of these interfaces seems MPLS enabled (your WAN service provider probably has an MPLS enabled device). I suggest you remove the MPLS tag from your question. – Marc 'netztier' Luethi Aug 7 '18 at 20:43