Bandwidth broker for a telecommunication system

The invention relates to a bandwidth broker (34, 36) for a domain (30, 32) of a telecommunication system comprising a plurality of domains, said bandwidth broker being associated with at least one border router (40, 50) of the corresponding domain in such a way that it can obtain information about the routing tables of this border router in order to be able to allocate resources to data routes inside the domain and outside the domain. This bandwidth broker (34) comprises means for receiving from, or sending to, the associated border router (40) route exchange messages, and means for sending to, or receiving from, other bandwidth brokers (36) same route exchange information in order that this bandwidth broker, together with the other bandwidth brokers, relay route exchange messages between border routers (40, 50). Preferably, the bandwidth broker comprises means for delaying route changes until resources have been allocated to the new route, and means for blocking the route change if resources are not sufficiently available on the new route.