A method for distributing routing information within an autonomous system from a border router of said autonomous system, said method comprising: establishing a multi-party transport protocol session wherein said border router is a session source in communication with receivers (2106, 2108) in said session, wherein the receivers are nodes of said autonomous system, wherein establishing the session comprises: receiving a join message from at least one neighbouring node the join message comprising a request to participate in said multi-party transport protocol session; receiving external border gateway protocol, EBGP, routing information from nodes outside said autonomous system; processing said EBGP routing information to develop internal border gateway protocol, IBGP, routing information; and distributing said IBGP routing information as a part of said multi-party transport protocol session via a distribution tree comprising said receivers (2106, 2108), the method further comprising: identifying at at least one node in the autonomous system, one or more neighbouring nodes by identifying a path toward said session source based on unicast routing protocol information to form the distribution tree for IBGP routing information from the session source; and generating a session announcement message including a session description and an identifier of the session source of the transport protocol session for distributing routing information database updates. establishing a multi-party transport protocol session wherein said border router is a session source in communication with receivers (2106, 2108) in said session, wherein the receivers are nodes of said autonomous system, wherein establishing the session comprises: receiving a join message from at least one neighbouring node the join message comprising a request to participate in said multi-party transport protocol session; receiving external border gateway protocol, EBGP, routing information from nodes outside said autonomous system; processing said EBGP routing information to develop internal border gateway protocol, IBGP, routing information; and distributing said IBGP routing information as a part of said multi-party transport protocol session via a distribution tree comprising said receivers (2106, 2108), the method further comprising: identifying at at least one node in the autonomous system, one or more neighbouring nodes by identifying a path toward said session source based on unicast routing protocol information to form the distribution tree for IBGP routing information from the session source; and generating a session announcement message including a session description and an identifier of the session source of the transport protocol session for distributing routing information database updates. receiving a join message from at least one neighbouring node the join message comprising a request to participate in said multi-party transport protocol session; receiving external border gateway protocol, EBGP, routing information from nodes outside said autonomous system; processing said EBGP routing information to develop internal border gateway protocol, IBGP, routing information; and distributing said IBGP routing information as a part of said multi-party transport protocol session via a distribution tree comprising said receivers (2106, 2108), the method further comprising: identifying at at least one node in the autonomous system, one or more neighbouring nodes by identifying a path toward said session source based on unicast routing protocol information to form the distribution tree for IBGP routing information from the session source; and generating a session announcement message including a session description and an identifier of the session source of the transport protocol session for distributing routing information database updates. identifying at at least one node in the autonomous system, one or more neighbouring nodes by identifying a path toward said session source based on unicast routing protocol information to form the distribution tree for IBGP routing information from the session source; and generating a session announcement message including a session description and an identifier of the session source of the transport protocol session for distributing routing information database updates.