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Requirements Allow TDM LSPs to be signalled to support virtual concatenation RFC 4606 defines mechanisms if all VCG components follow the same path (i.e., a single control plane LSP) Hardware now allows VCG components to follow different paths (i.e., separate control plane LSPs) Need mechanisms for… Associating LSPs to form a single group Defining the characteristics of the group Size of group (i.e., capacity) Granularity of group members Number of group members A pre-established pool of ‘spare’ LSPs that can be added to a VCG Determining which ports/interfaces at the egress can support the VCG |