1. A method of managing network services, executable by one or more traffic management devices with at least one processor executing the method, the method comprising: providing network services to a client network comprising a network fabric at a self-contained network services system using a number of redundant instances of a network service application, the self-contained network services system comprising a policy-based forwarding device; and reconfiguring the policy-based forwarding device of the self-contained network services system in response to a change in the redundant instances of the network service application to adapt a distribution of network service tasks received from the client network among the redundant instances of the network service application.