1. A computer-executable method for updating routing information associated with a multicast group in an information-centric network (ICN), the method comprising: receiving, by a first node in the ICN, an update message for the multicast group from a neighbor node, wherein the multicast group includes a number of anchor nodes including a root anchor node having a smaller name than names of the other anchor nodes, and the update message specifies a prefix; determining one or more next-hop neighbors of the first node that have not reported the same root anchor viewed by the first node as an anchor or root anchor of the one or more next-hop neighbors; and forwarding the update message to the one or more next-hop neighbors.