Hierarchical directory gatekeepers (DGKs) describes an H.323 network configuration where multiple levels of gatekeepers (GKs) and DGKs are in the LRQ forwarding path.
Hierarchical DGKs are also known as N-tier DGKs because there can as many tiers in the hierarchy as needed for your network.
To configure N-tier DGKs, VRC uses a special type of managed region, called an LRQ transit region, which contains only DGKs.
Using VRC, you assign outgoing connections from your regular managed regions to these LRQ transit regions rather than directly to one another. LRQ transit regions can be configured to forward LRQs to yet another LRQ transit region, achieving another level of indirection in the LRQ forwarding hierarchy. This pattern is continued for as many levels of DGKs as necessary for your dial plan.
To configure the LRQ forwarding pattern for N-tier DGKs, VRC uses the Type parameter for outgoing region connections. The outgoing connection type parameters are:
Peer - There is no hierarchical relationship between this region and the region being pointed to for the outgoing connection.
Up - The region being pointed to for the outgoing connection is hierarchically above this region.
Down - The region being pointed to for the outgoing connection is hierarchically beneath this region.
The type parameter is also used for the VRC-generated CLI to determine the set of remote zone commands configured on the gatekeepers.