By default, clusters do not share resources, even if MultiCluster has been installed. To enable job forwarding, enable MultiCluster queues in both the submission and execution clusters.
A send-jobs queue can forward jobs to a specified remote queue. By default, LSF attempts to run jobs in the local cluster first. LSF only attempts to place a job remotely if it cannot place the job locally.
A receive-jobs queue accepts jobs from queues in a specified remote cluster. Although send-jobs queues only forward jobs to specific queues in the remote cluster, receive-jobs queues that accept jobs from a remote cluster accept work from any and all queues in that cluster.
You can configure multiple send-jobs and receive-jobs queues in one cluster.
A queue can forward jobs to as many queues in as many clusters as you want, and can also receive jobs from as many other clusters as you want.
A receive-jobs queue can also borrow resources using the resource leasing method, but a send-jobs queue using the job forwarding method cannot also share resources using the resource leasing method.