Troubleshoot faulty switchport

[Ranjita]

Hi,

I have a C9200L-48P switch with 4x1G uplink module.

Port Gi1/1/1 does not have an LED blinking when connected to another switch.

Ports Gi1/1/2-4 seem to work fine.

Could anyone please guide me on troubleshooting the port and also advise action?

[Leo Laohoo]

Loop Gi1/1/1 to itself.  Does the port go into error disable or does it stay down/down?

[balaji.bandi]

Port Gi1/1/1 does not have an LED blinking when connected to another switch.

These are the fixed uplink modules, what kind of SFP is this  Fiber or Copper ? (both supported in this case?)

change the SFP and test it, change the cable and test it. if the Fibre give a Loop and test it.

also post show interface gig 1/1/1 output here?

what IOS XE running on this switch ?

[Ranjita]

Hi @balaji.bandi ,

Thanks for the response.

Currently I have SFP modules plugged in. The same SFP module and FO Cable is working fine on port Gi1/1/2.

The switch is running on 17.9.4a.

Output of show interface:

sh int gi1/1/1
GigabitEthernet1/1/1 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 648f.3e30.61b1 (bia 648f.3e30.61b1)
Description: MUX B
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 not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
input flow-control is on, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, 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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
Output 0 broadcasts (0 multicasts)
0 output errors, 0 collisions, 2 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

[Reza Sharifi · Accepted solution]

Hi,

"media type is 1000BaseLX SFP"

Are you using a single-mode cable since the optic is single-mode?

If yes, you may want to upgrade to a different version and if that does not solve the problem, you may need to RMA the switch.

HTH

[balaji.bandi · Accepted solution]

Currently I have SFP modules plugged in. The same SFP module and FO Cable is working fine on port Gi1/1/2.

If the SFP Module and Obtic cable working on other ports, may be chances are port gone bad, to confirm that loop the SPF port using single patch cable, see is the port come up ?  if not ?

last is raise TAC case (if hardware issue replace it)