Connection between two Zyxel GS1920-48HPv2 over LACP

mango122

Hello,

i want to connect two Zyxel GS1920-48HPv2 switches together due to failover reasons via LACP but i get stuck here.

I have following setup as shown in the picture:

I have configured static LACP between Switches in Building 1 Ground Floor Rack 1 and Building 1 Ground floor Rack 2 but as soon i connect cables, both switches get unavailable.

I have the same configuration between Switches in Building 1 1st Floor and Building 1 Ground Floor Rack 1 - everything is working fine!

I have copied the configuration from the working setup to the other 2 switches but i can´t get it running.

Maybe somebody of you have an idea why?

Thanks in advance!

Zyxel_Melen

Hi @mango122,

LACP group cannot be used cross-segment. I assume the LACP group between 1 floor and rack 1 is the same as the group between rack 1 and rack 2 since you said you copied the configuration. Please make one group as T1 and another as T2.

Please feel free to share rack 1 & 2's configuration so we can investigate deeper.

mango122

Hello,

thanks for your reply - i tried to change the Groups, but is still the same issue.

Please find configurations attached

config1_GS1920_Rack2.log

config1_GS1920_Rack1.log

Additional information: When i activate LACP protocol on Rack 2 the Ports are up without Switch is going Down. On Rack 1 the Ports are also up with State "BLOCKING" - as soon as i activate LACP on Rack 1 too, Switch is going down again.