Broadcast domains enable you to group network ports that belong to the same layer 2 network. The ports in the group can then be used by a Storage Virtual Machine (SVM) for data or management traffic.
A broadcast domain resides in an IPspace. During cluster initialization, the system creates two default broadcast domains:
These ports are used primarily to serve data. Cluster management and node management ports are also in this broadcast domain.
These ports are used for cluster communication and include all cluster ports from all nodes in the cluster.
If you have created unique IPspaces to separate client traffic, then you need to create a broadcast domain in each of those IPspaces.
The Metrocluster Config Guide should mention that broadcast domains are intended to be configured prior to establishing an MCC relationship, as broadcast domains are the intended way for the admin to inform Ontap of the physical connectivity of the network ports.