LAG between Dell N-3024 and Ruckus ICX 7150

Hello there,

I have 2 Dell Stacks linked together with a dynamic fiber LAG (2 ports).
It works as expected for years.

We recently bought Ruckus switches for a new telecommunication room.

I want to achieve the same: connect the Ruckus Stack with a Dell stack using 2-link LAG.

The network schema is in attachment (not able to upload an image...).

Stack 1:                                      Stack 2:                                     Stack 3:                                    Stack 4:
┌───────────┐               ┌───────────┐               ┌───────────┐               ┌───────────┐
│ Dell N-3024│<--LACP/LAG-->| Dell N-3024│<--LACP/LAG-->| ICX 7150         │                 │ ICX 7150           │
│
└──────┬────┘               └──────┬────┘               └──────┬────┘               └──────┬────┘
       │                             │                             │                            │
┌──────┴────┐               ┌──────┴────┐               ┌──────┴────┐               ┌──────┴────┐
│ Dell N-3024│<--LACP/LAG-->| Dell N-3024│<--LACP/LAG-->| ICX 7150  │                       │ ICX 7150             │
│
└───────────┘               └───────────┘               └───────────┘               └───────────┘
                                                                              ▲                                                                  ▲
                                                                              └---------------LACP/LAG--------------------┘



To summarize, as soon as LAG between Stack 2 and Stack 3 is UP, RSTP blocks traffic between Stack 2 and Stack 4 (and vice versa). As a consequence, the Ruckus stack is unable to learn ARP and all traffic from and to the Dell stack is blocked.

If I connect Ruckus stacks to the Dell stack with a single port (not part of a LAG), that works.

I spent hours with the Ruckus support, exploring all scenarios of tagged/untagged VLANs.

We paid attention to configure same LAG type, VLANs, speed, etc

My guess is that there is not an out-of-the-box compatibility between Dell and Ruckus regarding the spanning-tree protocols.

Dell is configured globally with Rapid Spanning-tree with default options for related settings (priority, etc).

Before to give up and interconnect stacks with a single link only, I wanted to check if someone had an idea.
I would not prefer to change configuration on the Dell-end since they are part of the network that is presently working.