The simple three-node network in Figure 1 shows two MPLS SDPs and one GRE SDP defined between the nodes. These SDPs connect VPLS1 and VPLS2 instances that are defined in the three nodes. With this feature, the operator has local CLI-based as well as SNMP-based statistics collection for each VC used in the SDPs. This allows for traffic management of tunnel usage by the different services and with aggregation of the total tunnel usage.
SDP statistics allow providers to bill customers on a per-SDP per-byte basis. This destination-based billing model can be used by providers with a variety of circuit types and have different costs associated with the circuits. An accounting file allows the collection of statistics in bulk.