By default, Trusted Extensions does not provide multilevel services. Most services are easily configured as zone-to-zone services, that is, as single-label services. For example, each labeled zone can connect to the NFS server that runs at the label of the labeled zone.
If your site requires multilevel services, these services are best configured on a system with at least two IP addresses. The multilevel ports that a multilevel service requires can be assigned to the IP address that is associated with the global zone. An all-zones address can be used by the labeled zones to reach the services.