Unsupported Dhl Active-Active Topology (Network Loops) - Alcatel-Lucent OmniSwitch 9900 Series Network Configuration Manual

Configuring Dual-Home Links

Unsupported DHL Active-Active Topology (Network Loops)

The following is an example of an unsupported topology for Dual-Homed Link Active-Active.
In the above topology, the link between the uplink device other than core network is not recommended as
it creates a loop in the network. This topology violates the principle that uplink switches can only be
connected to the network cloud through the core network.
OmniSwitch AOS Release 8 Network Configuration Guide December 2017
Dual-Home Link Active-Active
page 10-11