“…Parameters of resource allocation, bandwidth, latency, etc, for intra-domain connections have to be advertised for inter-domain traffic, while at the same time preserving the integrity of every domain and respecting the scalability of signaling [18]. In addition, the requirements for scalability and resource visibility for each domain are different which also put challenge to routing and resource allocation Figure 4 Hierarchical Label Space for PBB-TE Network 2 [19]. Expected are functionalities equivalent to those for packet-based MPLS, which provide a framework for establishing traffic engineered LSP across multiple MPLS/GMPLS domains [20].…”