Hello.
If a specific interface is connected to the equipment I'm using and the desktop is connected, the network will be disconnected after two to three minutes and the Internet will be unavailable.
I don't think there will be a big problem with the setup, so I recently upgraded the version, but the same problem occurred, so I want to know what's the cause and what's the solution.
Below is the equipment information.
Model Name : C9200-24T-4G
Previous version: 16.9.3
Current version: 17.09.04a
Problem interface information (show interface)
GigabitEthernet1/0/21 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 5c5a.c709.f515 (bia 5c5a.c709.f515)
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 off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:13:48, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2539
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 30000 bits/sec, 14 packets/sec
5 minute output rate 150000 bits/sec, 30 packets/sec
17495701 packets input, 6321304086 bytes, 0 no buffer
Received 297216 broadcasts (259786 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 259786 multicast, 0 pause input
0 input packets with dribble condition detected
57417203 packets output, 52645976416 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
1089 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
interface GigabitEthernet1/0/21
switchport access vlan 10
switchport mode access
spanning-tree portfast
spanning-tree guard loop
The network configuration to which the target equipment is connected is as follows.
Internet - Router - Firewall - Layer 3 Switch - Layer 2 Switch (Target Equipment) - PC
Interface configuration information.
interface GigabitEthernet1/0/19
switchport access vlan 162
switchport mode access
spanning-tree portfast
spanning-tree guard loop
