The maintenance domain level is a mandatory parameter to indicate the nesting relationship between various maintenance domains. The level is embedded in each of the CFM frames. CFM messages with a given level are processed by MEPs at that same level. For example, the operator domain can be level 0, the provider domain at level 3, and the customer domain at level 7.
To configure the maintenance domain level, include the level number statement at the [edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name] hierarchy level.