1. A method implemented by a network device for enabling the provisioning of explicit trees in a network by reporting link aggregation group (LAG) configuration information to a path computation element (PCE), the network device implementing a LAG module and an intermediate system intermediate system (IS-IS) module including an IS-IS path control and reservation module (ISIS-PCR), the method comprising: reporting LAG configuration by the LAG module to the IS-IS module within the network device; sending a link state protocol data unit (PDU) (LSP) with the LAG configuration in a LAG sub type length value (TLV) by the ISIS-PCR; receiving, by the IS-IS module, an explicit tree that specifies at least one virtual local area network (VLAN) identifier (VID) to aggregation link of the LAG assignment; and translating, by the ISIS-PCR module, the explicit tree into a LAG configuration, the LAG configuration specifying a conversation to aggregation link assignment.