19.2.1.5. Domain concept 
In very large enterprise networks it may be necessary to subdivide
the network into several so called domains. Depending on the configuration
DMC connections may be allowed only within these domains or end-to-end
over several domains.
Example 1: DMC possible from domain A until domain B:
Note: for this scenario no special configuration is needed (default)
Example
2: DMC not possible from domain A to domain B, DMC only possible within
domains A and B:
In this case both ends of the link between the domains have to be
marked as domain end.
This is done with an attribute within LCR (see chapter Generation).
This attribute has to be set in domain I for the LCR route leading to
domain II, and in domain II for the LCR route leading to domain I.
