One of our Cisco 9300L switches keeps showing this error:
%PM-4-ERR_DISABLE: loopback error detected on Gi2/0/5, putting Gi2/0/5 in err-disable state
%PLATFORM_PM-3-LOOP_BACK_DETECTED: Loop-back detected on GigabitEthernet2/0/5
This port is our WAN Internet port
When this port goes down there is no communication and I have to do shut, no shut to the port to fix it.
I ran the command: errdisable recovery cause all
(so that it will be automatically recover after entering err-disable)
Port configuration:
interface GigabitEthernet2/0/5
description Internet
switchport access vlan 400
switchport mode access
SW#show interfaces GigabitEthernet 2/0/5
GigabitEthernet2/0/5 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 7c21.0ea6.e142 (bia 6c21.0eb1.e325)
Description: Internet
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 85000 bits/sec, 53 packets/sec
5 minute output rate 364000 bits/sec, 66 packets/sec
1300346167 packets input, 1197135862880 bytes, 0 no buffer
Received 19769103 broadcasts (8692356 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 8692356 multicast, 0 pause input
0 input packets with dribble condition detected
891323582 packets output, 789310630018 bytes, 0 underruns
Output 786 broadcasts (0 multicasts)
0 output errors, 0 collisions, 14 interface resets
103744 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
How do I fix this error?
Thanks a lot !
