07-13-2024 02:23 PM
hi there...I have a Cisco 110-16-PP SMB switch. I have a cable connecting my Xfinity modem/router to a non-POE port on this switch. The left LED light on this port is flashing Amber, and the right LED light is solid green. This suggests a network loop of some kind. However, as a test, I unplugged everything else from the switch except the connection from the modem/router to the switch, and the flashing amber LED remains. If there is nothing else connected to the switch, how can I have a network loop? Or is this a faulty switch?
thank you,
Trevor
07-13-2024 11:37 PM
- FYI : https://community.cisco.com/t5/switches-small-business/sg110-leds/m-p/3301777#M19339
Check logs on the device too , and or when a connection attempt with a foreign device is attempted
M.
07-13-2024 11:41 PM
Thanks. I’ve read this thread. It doesn’t answer my question. And given that this is an unmanaged switch, I don’t believe there are any logs.
07-13-2024 11:48 PM
- Then that may be your 'fatal problem' ; being an unmanaged switch which should be at all cost
avoided in modern networks (the use of them)
. Because there is no configuration handling possible if a connected device
has special requirements concerning spanning tree , VTP , ...
M.
07-14-2024 09:42 AM
This didn’t answer the question about the switch.
07-14-2024 10:08 AM
- The logic of the device is probably too simple (too) , to recover from that condition. Try a full power cycle ,
M.
07-14-2024 12:45 PM
I Cycled the power. Same behavior. Note: I’m looking for an answer as to why a single connection (from a modem) to a switch would yield a flashing Amber, suggesting a network loop, when there isn’t a single other device connected to the switch. Suggesting I throw away the switch isn’t a solution.
07-14-2024 11:21 PM - edited 07-14-2024 11:44 PM
- If the light remains flashing Amber with no connections at all and after power up then the device could have a hardware problem.
You may also try and look at the logs on the modem when the connection to the switch is made (if available)
>...Suggesting I throw away the switch isn’t a solution.
- Note that the forums are populated by customers based on best effort. For for official Cisco support checkout :
https://www.cisco.com/c/en/us/support/web/tsd-cisco-small-business-support-center-contacts.html
M.
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