Shared networks - BlueCat Integrity - 9.3.0

Address Manager API Guide

Product name
BlueCat Integrity

Shared network declarations in DHCP are used to group together different logical subnets that share the same physical network.

Note: Shared networks are known as superscopes in Windows.
Note: For shared networks, each network in the shared network must have the same type of DHCP deployment role assigned to its network object.

For example, consider a network with 250 workstations on a physical network with the logical address ID of You need to add 100 workstations to this physical network, but the only available subnet ID is If the subnets were contiguous (that is, and 24), you could modify the subnet mask to create a single logical subnet to accommodate the additional computers ( However, the two network IDs are not contiguous.

By configuring a shared network, you can group the two networks together. The benefit is that your DHCP server can allocate IP addresses from the common shared network to any host on either of the networks, without the need to isolate the networks to different router interfaces.

Tag groups and tags are the mechanism by which subnets are grouped into DHCP shared networks. To use shared networks, you need to associate a single tag group with a configuration. A configuration can have many associated tags, but only one tag that is associated for the purpose of forming shared networks.