Port description additional ports shown next to a port

[radokristof]

What does the following ports mean next to a port on a device?

Looks like it is random information, even on ports which are disabled:

[PipoCanaja]

Hi @radokristof
It is not random, it lists ports that have good chances to be connected (sharing same IP subnet range, etc etc)

[radokristof]

For me, it is not correct in any case Checked around 10 ports.
Is it somehow possible to correct this? Where does this data come from?

[PipoCanaja]

It comes from the device discovery. So it could be that your type of device is not discovered correctly. Can you give us more details ?

• device (local and distant)
• ip ranges (local and distant)
• any discovery protocols (like LLDP etc)

In this view for instance, all the lines on the right part are interfaces of devices that are indeed connected to Vlan 99

[murrant]

Enabling ARP discovery will basically link everything together because it cannot detect topology only what MACs are seen on a port.

[radokristof]

I think device is discovered correctly.

I usually use Mikrotik devices. Discovery protocols, LLDP and CDP is also enabled.
IP ranges: The management interface only has one subnet, which is 10.0.14.0/24 in current case
@murrant ARP discovery is not enabled:

librenms:/opt/librenms# lnms config:get discovery_modules.discovery-arp
false

[radokristof]

Ok, now I understand, it is not that “random”.

But it shows devices/ports from different locations connected. It is not connected at all, they just have the same subnet.
It is somehow possible to restrict this to each location?

[PipoCanaja]

Not currently. And more importantely, LibreNMS cannot know for sure if 2 locations share the same subnet (L2 speaking) or only have overlapping ip range without L2 connectivity … So this will always be only a hint for the network admin (unless you come with a solution to make it more precise that would be failsafe with different devices)

[radokristof]

Ok thank you!