Use hierarchical DGKs to configure your H.323 network for several levels of directory gatekeepers in the forwarding path by using LRQ transit regions, a special type of managed region which contains only one directory gatekeeper group.
To accomplish this type of configuration, assign outgoing connections from the regular managed regions in your dial plan to the LRQ transit regions instead of to one another.
The LRQ transit regions can be configured to forward LRQs to yet another LRQ transit region and this can continue until you reach the desired hierarchical level for your network.
Administrative privileges can be assigned for each LRQ transit region to allow administrative groups to distinguish them from other regions.
To configure hierarchical directory gatekeepers:
Add your regions to the VRC topology.
Configure the regions so that one or more contain only DGKs and one or more contain at least one gateway and one gatekeeper.
Start a new design session for the AD (or you can design each region separately).
For the regular region(s) that contain gateways, add the region to the dial plan and configure as a managed region.
For the region(s) that contain only directory gatekeepers, add the regions to the dial plan and set the role to LRQ Transit.
For each LRQ transit region (step 5), add a single directory gatekeeper group.
Add directory gatekeepers to the DGK groups as needed.
Configure the directory gatekeeper groups (step 6) and directory gatekeepers (step 7) as you would for a regular managed region.
For each region (regular and LRQ transit) configure one outgoing connection for the child region and set the connection type to down.
Interconnect all LRQ transit regions at the top of the DGK hierarchy with outgoing connections and set the connection type attribute to peer. LRQ transit regions connected to regular regions should not be of type peer.