Warning: Multiple LLDP neighbours on port X - EEE operational state is FALSE

[brandontpa]

We have the CISCO SG300 28 port switch. I have noticed some log warning that appear like this:

2147451055	2017-Aug-30 11:35:01	Warning	%NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi12 - EEE operational state is FALSE      
2147451230	2017-Aug-30 11:35:01	Warning	%NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi12 - EEE operational state can be TRUE      
2147451405	2017-Aug-30 11:29:35	Warning	%NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi12 - EEE operational state is FALSE    

My initial research yielded that this is likely caused by a user/port/LAN that has multiple devices on it. That is true in my case. Port GE12 is connected to one of our offices that has limited ethernet jacks, so we run separate ethernet cables from the desktop and IP phone into an unmanaged switch, and from there they become one, connecting to a single ethernet jack. (to help explain this I have included a diagram below)

Assuming that this setup is what is causing the error I am wondering how I can resolve it. Is there a specific setting that I can configuration that will be more optimized for the way port GE12 is setup?

[Philip D'Ath]

Try changing it to a trunk port.

[brandontpa]

Any reference I have seen to trunk ports (maybe in the VLAN settings?) has all ports, including GE12, set to trunk. Does the tagged/untagged setting make any difference? I am fairly certain they are all untagged as well.

If it isn't obvious already, my knowledge of CISCO switches, or any managed switch, is almost non-existant. So I apologize in advance if I say something that doesn't make any sense :)

[Philip D'Ath]

The error you have given only happens on access ports. If you change it to a trunk port you should not get the error any more.

[brandontpa]

Got it. I will have to look over the settings again. Was I correct earlier the ability to set trunked is in the VLAN settings?

[Philip D'Ath]

I don't know that sorry. I'm not that familiar with this series of switches.

[brandontpa]

Understood. I appreciate the suggestion. I will look into it when I get back into the office tomorrow.

[brandontpa]

I decided to come back into the office tonight to investigate your suggestion, and all ports are indeed trunked. Sadly, on arrival the switch was in boot error again. This is actually the real issue I am trying to resolve, the warning message in this topic was just a lead I was chasing down, which I hoped was the cause.

Just for the hell of it I have copied in the log file from tonight. It doesn't really show much in the way of a major event that might have caused it to restart or lose connection. I'm hoping someone has a suggestion or two that I can investigate further.

[Anilsingh]

Hi Brandontpa,

Did you find any solution for below error because i have same error in SG300 switch..

2147483488 2021-Jan-29 11:13:27 Warning %NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi24 - EEE operational state can be TRUE
2147483489 2021-Jan-29 08:54:39 Warning %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi24 - EEE operational state is FALSE
2147483490 2021-Jan-28 18:26:15 Warning %NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi24 - EEE operational state can be TRUE
2147483491 2021-Jan-28 13:51:19 Warning %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi24 - EEE operational state is FALSE
2147483492 2021-Jan-28 12:52:10 Warning %NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi24 - EEE operational state can be TRUE
2147483493 2021-Jan-28 12:50:39 Warning %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi24 - EEE operational state is FALSE

[irfanjamil1994]

the same issue i am facing in SG250 SW. Please guide me how to fix it. Thanks,

18-Jun-2019 11:34:10 %NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi16 - EEE operational state can be TRUE

18-Jun-2019 11:34:10 %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi16 - EEE operational state is FALSE

[Renevk]

Someone has solved the problem?  I have a CBS250 and have the same problem . Sometimes the status changes a few time within minutes.  Port setting have been set to thrunk and i use firmware 3.1.1.7.

[donmatlock1]

Was there any root solution or cause to this issue, I myself experienced it this weekend.

[emilio_]

Hello,

As the message says, there are multiple LLDP neighbors. Assuming the phone needs LLDP, deactivate LLDP on the PC. Go to ethernet adapter properties and you'll find a LLDP protocol controler. Just deactivate it.

[Renevk]

The strange thing is: i disabled every "green setting"   In the port/green ethernet/properties. on the CBS250.  Only the led option is active. And for all ports green ethernet/portsettings i disabled both the LLDP operational en admin. And i can see this is disable in the overview.

Why do i still get this LLDP up/down warning?

[emilio_]

If LLDP isn't active, it's not possible to have LLDP neighbors so the message of "Multiple LLDP neighbors" can't happen.

Make sure LLDP is inactive.

config

no lldp

exit

wr