As Ron Trunk pointed out, LACP uses a special multicast OUI on its frames. Your unmanaged switch does not recognize the OUI, only that it is multicast, and it sends the multicast frames to every other switch interface. LACP frames are sent with the special 01:80:c2:00:00:02 multicast MAC address. The IEEE has reserved the 01:80:c2 OUI for link protocols, and ...
I'd suggest using show inventory since that will show Model (also known as PID), version (hardware revision) ID, along with the serial number. For a switch it would show something like PID: WS-C3850-48T-E, VID: V02, SN: FOC1234567 so you know right away that it's a switch, model Catalyst 3850 48-port.
How do I route the lacpdu packets through the unmanaged switch and make the etherchannel work?
Etherchannel, LACP or a static LAG trunk can't work across an unmanaged switch ever.
As both Rons have suggested you need either:
a managed switch with an Etherchannel or an LACP trunk to each of the other switches
a managed switch w/o LACP filtering (non-...
You probably can't with a single switch. LACP frames are multicast, so the unmanaged switch will flood them out all ports. This will cause several problems:
The sending switch will see its frame received on its other port. The switch will interpret this as a loop and refuse to aggregate the link.
The receiving switch will see the same packet on both ...
don't use duplicate IP addresses ever unless you're asking for trouble
DHCP servers can be set up in redundant/failover mode, that is what you want
reserve IP addresses by MAC, so they don't change
use a layer-3 switch for routing in between subnets (low price, high performance)
depending on budget and requirements, consider a redundant switch layer in ...
There's no general rule for that. Different vendors do things differently, even with different device series.
Most often, there are two indicators per port: one indicating link status (also lighting up briefly when an inserted module is activated) and the other indicating activity - either direction.
Note that both link status and activity are from the ...
For the same fiber, one switch on one end was saying the link was up,
and the other switch on the other and was saying the same link was
That happens when Switch A (Rx) receives a signal from Switch B (Tx), but Switch B (Rx), for whatever reason (bad fiber, bad SFP, dirt/dust, etc.) does not receive a good signal from Switch A (Tx). Switch A ...