Hello, everyone.
Does anyone can help with troubleshooting problem with output packet drops at the 3850 switch? The problem is that I see a lot of packet drops at the some interfaces at the low traffic rate (maximum is 100 Mbits at the 1G ports).
GigabitEthernet1/0/26 is up, line protocol is up (connected)
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 165898
Output queue: 0/40 (size/max)
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
165898 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
GigabitEthernet2/0/26 is up, line protocol is up (connected)
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 18264
Output queue: 0/40 (size/max)
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
18264 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
interface Port-channel36
switchport
switchport access vlan 1
switchport trunk native vlan 1
switchport private-vlan trunk encapsulation dot1q
switchport private-vlan trunk native vlan tag
switchport mode trunk
no switchport nonegotiate
no switchport protected
no switchport block multicast
no switchport block unicast
no ip arp inspection trust
ip arp inspection limit rate 15 burst interval 1
ip arp inspection limit rate 15
load-interval 300
carrier-delay 2
no shutdown
ipv6 mld snooping tcn flood
ipv6 mfib forwarding input
ipv6 mfib forwarding output
ipv6 mfib cef input
ipv6 mfib cef output
snmp trap mac-notification change added
snmp trap mac-notification change removed
snmp trap link-status
arp arpa
arp timeout 14400
spanning-tree guard root
spanning-tree port-priority 128
spanning-tree cost 0
hold-queue 2000 in
hold-queue 40 out
ip igmp snooping tcn flood
no ip dhcp snooping information option allow-untrusted
no bgp-policy accounting input
no bgp-policy accounting output
no bgp-policy accounting input source
no bgp-policy accounting output source
no bgp-policy source ip-prec-map
no bgp-policy source ip-qos-map
no bgp-policy destination ip-prec-map
no bgp-policy destination ip-qos-map
interface GigabitEthernet1/0/26
switchport
switchport access vlan 1
switchport private-vlan trunk encapsulation dot1q
switchport private-vlan trunk native vlan tag
switchport mode trunk
no switchport nonegotiate
no switchport protected
no switchport block multicast
no switchport block unicast
no ip arp inspection trust
ip arp inspection limit rate 15 burst interval 1
ip arp inspection limit rate 15
load-interval 300
carrier-delay 2
no shutdown
ipv6 mld snooping tcn flood
ipv6 mfib forwarding input
ipv6 mfib forwarding output
ipv6 mfib cef input
ipv6 mfib cef output
snmp trap mac-notification change added
snmp trap mac-notification change removed
snmp trap link-status
cts role-based enforcement
cdp tlv location
cdp tlv server-location
cdp tlv app
arp arpa
arp timeout 14400
channel-group 36 mode active
spanning-tree guard root
spanning-tree port-priority 128
spanning-tree cost 0
hold-queue 2000 in
hold-queue 40 out
ip igmp snooping tcn flood
no ip dhcp snooping information option allow-untrusted
no bgp-policy accounting input
no bgp-policy accounting output
no bgp-policy accounting input source
no bgp-policy accounting output source
no bgp-policy source ip-prec-map
no bgp-policy source ip-qos-map
no bgp-policy destination ip-prec-map
no bgp-policy destination ip-qos-map
interface GigabitEthernet2/0/26
switchport
switchport access vlan 1
switchport private-vlan trunk encapsulation dot1q
switchport private-vlan trunk native vlan tag
switchport mode trunk
no switchport nonegotiate
no switchport protected
no switchport block multicast
no switchport block unicast
no ip arp inspection trust
ip arp inspection limit rate 15 burst interval 1
ip arp inspection limit rate 15
load-interval 300
carrier-delay 2
no shutdown
ipv6 mld snooping tcn flood
ipv6 mfib forwarding input
ipv6 mfib forwarding output
ipv6 mfib cef input
ipv6 mfib cef output
snmp trap mac-notification change added
snmp trap mac-notification change removed
snmp trap link-status
cts role-based enforcement
cdp tlv location
cdp tlv server-location
cdp tlv app
arp arpa
arp timeout 14400
channel-group 36 mode active
spanning-tree guard root
spanning-tree port-priority 128
spanning-tree cost 0
hold-queue 2000 in
hold-queue 40 out
ip igmp snooping tcn flood
no ip dhcp snooping information option allow-untrusted
no bgp-policy accounting input
no bgp-policy accounting output
no bgp-policy accounting input source
no bgp-policy accounting output source
no bgp-policy source ip-prec-map
no bgp-policy source ip-qos-map
no bgp-policy destination ip-prec-map
no bgp-policy destination ip-qos-map
The queue size at the other side is 75. So there shouldn't be any problems. Also I didn't have this problem before IOS update (previous version was 03.02.03 and current one is 03.06.06)
Best Regards.
