C9407 - High Total Output Drops

[SteveSnyder5300]

Spoiler

Here's the situation.  Catalyst 9407 connected to a Brocade switch via G2/0/48 (copper).  Receiving high amount of Total Output Drops on said port.  Both devices are negotiating at 1000/Full.  Results of SHOW INT G2/0/48 below..

9407Core#sh int g2/0/48
GigabitEthernet2/0/48 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is a8b4.5622.f7e7 (bia a8b4.5622.f7e7)
Description: *** To brcdlwccxternal port 1/1/1 ***
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 10/255, rxload 5/255
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
Auto-MDIX on (operational: on)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:09, output 00:00:00, output hang never
Last clearing of "show interface" counters 03:25:27
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 87795387
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 21866000 bits/sec, 4709 packets/sec
5 minute output rate 41155000 bits/sec, 5799 packets/sec
106839444 packets input, 47012491646 bytes, 0 no buffer
Received 10983 broadcasts (430 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 430 multicast, 0 pause input
0 input packets with dribble condition detected
174227789 packets output, 178408299126 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
9407Core#

...AND the Brocade interface...

telnet@brcdlwccxtrnl#sh int eth 1/1/1
GigabitEthernet1/1/1 is up, line protocol is up
Hardware is GigabitEthernet, address is 0024.38c3.8000 (bia 0024.38c3.8000)
Configured speed auto, actual 1Gbit, configured duplex fdx, actual fdx
Configured mdi mode AUTO, actual MDIX
Member of L2 VLAN ID 1, port is untagged, port state is FORWARDING
BPDU guard is Disabled, ROOT protect is Disabled
Link Error Dampening is Disabled
STP configured to OFF, priority is level0, mac-learning is enabled
Flow Control is config disabled, oper disabled
mirror disabled, monitor enabled (input only)
Not member of any active trunks
Not member of any configured trunks
Port name is uplink to core 2/0/48
Inter-Packet Gap (IPG) is 96 bit times
IP MTU 1500 bytes
300 second input rate: 47646168 bits/sec, 6455 packets/sec, 4.86% utilization
300 second output rate: 23841840 bits/sec, 5263 packets/sec, 2.46% utilization
63027115786 packets input, 75180445212094 bytes, 0 no buffer
Received 274930064 broadcasts, 18827115 multicasts, 62733358607 unicasts
0 input errors, 0 CRC, 0 frame, 0 ignored
0 runts, 0 giants
28184175257 packets output, 9492606603634 bytes, 0 underruns
Transmitted 4278887 broadcasts, 193596 multicasts, 28179702774 unicasts
0 output errors, 0 collisions
Relay Agent Information option: Disabled

How can I tell if I am oversubscribing this interface?  Any tuning parameters that may be helpful?  Thanks in advance

[Reza Sharifi]

reliability 255/255, txload 10/255, rxload 5/255

5 minute input rate 21866000 bits/sec, 4709 packets/sec
5 minute output rate 41155000 bits/sec, 5799 packets/sec

According to these numbers, very little traffic (less than 50Mbps) traversing this interface. So, the interface defiantly is not oversubscribed. Do you have any qos policy applied to this interface?

HTH