1. A method for use in routing Point-to-Multi-Point (P2MP) services in a multi-domain network with a Hierarchical Path Computation Element (H-PCE) architecture, the method comprising a Child Path Computation Element (C-PCE) of one of the domains: determining summarized domain topology information about the domain, the summarized domain topology information comprising an indication of whether a node of the summarized domain topology is capable of supporting a branch point for Point-to-Multi-Point services; and sending the summarized domain topology information to a Parent Path Computation Element (P-PCE).