Topology deployment is required only when using publish/subscribe. It informs each broker in the domain of the brokers with which it can share publications and subscriptions.
Whatever type of deployment you perform, the Configuration Manager attempts to subscribe to the broker's status messages if it is the first deployment to the broker. However only a complete topology deployment initiates a further subscription.
You can deploy a complete topology. Deploying a complete topology:
Deploying a delta topology sends updated publish/subscribe network information to any broker with a publish/subscribe configuration that the Configuration Manager determines not to be current.