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PWE3 and MPLS support an IP-based control plane, which governs the way the network sets up, maintains, and tears down pseudowires and MPLS tunnels An MPLS-enabled EoS network that implements this control plane can interwork easily with the large installed based of IP/MPLS-based core networks
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Figure 1110 illustrates the application of pseudowires and MPLS in EoS networks
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The addition of an intelligent control plane represents a third trend for EoS networks As stated previously, PWE3 and MPLS support an IP-based control plane that governs all aspects of connection management at the pseudowire and MPLS layers (eg, routing of connections through the network, distribution of pseudowire and MPLS labels, resource allocation, and QoS support) This control plane places the resources for real-time connection (or virtual connection, for pseudowires and MPLS tunnels) management within the network itself, not in external systems such as element management systems (EMSs) or human beings This automates the connection management process, which can dramatically speed service provisioning times and reduce provisioning errors Generalized MPLS (GMPLS) extends the benefits of the MPLS control plane to physical layer connections such as SONET paths and DWDM lightpaths (ie, wavelengths) While the GMPLS control plane is functionally similar to the MPLS control plane it uses many of the same routing and label distribution protocols the two control planes work at different network layers and often operate independently Because an EoS
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PW MPLS Tunnel Ethernet PE MSPP DS-n OC-N ring Ethernet MSPP MSPP DS-n PE MSPP Only switches MPLS tunnel Only switches IP/MPLS network MPLS tunnel
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OC-N MSS/SER MSS/SER Ethernet
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Figure 1110 Application of pseudowires and MPLS in EoS networks
SONET/MSPP
network element such as an MSPP can support Ethernet/MPLS/SONET, it is often the place where the MPLS control plane meets the GMPLS control plane As the deployment of control plane functions grows, MSPPs will play an important role in tying together the MPLS and GMPLS control planes This will help service providers to see a more unified view of Layer 1 and Layer 2 connection management and further speed provisioning times and reduce network operations costs
Economic Assessment
This section examines a small network that highlights the economic benefits of EoS Figure 1111 illustrates this example network, which comprises five customer locations (A through E), two central offices (COs), and one data center Two access rings connect the customer locations to the COs, and an interoffice facility (IOF) ring connects the COs and the data center In this example, the service provider uses two types of EoS-equipped network elements to build the network:
MSPPs, which are capable of supporting OC-12, OC-48, and OC-192 SONET interfaces, Ethernet interface cards that support EoS transport (Ethernet/GFP/VCAT/ LCAS), and Ethernet interface cards that support RPR/SONET Small micro-MSPPs ( -MSPPs) that support OC-12 SONET interfaces and EoS transport only
Table 115 highlights the typical costs of these systems
Ethernet A -MSPP 8 -MSPP8 OC-12 Access ring Ethernet B -MSPP 9 Ethernet C
Central office X
Central office/ Data center Ethernet MSPP 3 IP services network Ethernet services network
MSPP 1 OC-192 Interoffice ring
MSPP 7 OC-48 Dedicated ring
Ethernet D
MSPP 6
MSPP 4
MSPP 2 Ethernet
E Ethernet
MSPP 5
Central office Y
Figure 1111 EoS in an example network
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TABLE 115 EoS Network Element
EoS Network Elements in the Example Network Typical Cost: Common Equipment + SONET and DS-n Interfaces $40,000 $10,000 Typical Cost: EoS Transport Interface Card (GFP/VCAT/LCAS) $4000 $1000 Typical Cost: EoS/RPR Card $6000 N/A
MSPP (OC-12/48/192) -MSPP (OC-12)
This network supports the three key applications of EoS (refer to Section Typical Deployment/Scenarios ):
EPL service delivery In the example network, customer locations A and B have E-Line services to customer location D Ethernet access to Ethernet or IP services Customer locations C, D, and E have access to the Ethernet and IP services provided by the switch and router at the data center Dedicated EoS networks Customer locations C, D, and E (and the node at CO Y) form a dedicated Ethernet network with E-LAN connectivity among these three locations
The economic analysis investigates three deployment scenarios:
Greenfield network In this scenario, none of the EoS network elements have been deployed The service provider must build the entire access network IOF in place In this scenario, the service provider already has deployed a SONET IOF network (MSPPs 1, 2, and 3) to support its general IOF requirements To support the additional Ethernet service requirements in this example, the service provider must deploy the two access rings and must equip MSPPs 2 and 3 with EoS transport interface cards IOF + access in place Here, the service provider already has deployed the SONET IOF and access networks to support its general IOF requirements and to provide DS-n and/or OC-N access and services to its customers The incremental Ethernet services in this example require only the addition of Ethernet interface cards at the MSPPs MSPPs 4, 5, 6, and 7 are equipped with EoS/RPR cards to support the E-LAN connectivity requirements of the dedicated network
Table 116 summarizes the incremental costs of using EoS-equipped MSPPs to deliver the Ethernet services in this example network These solution costs use the typical unit costs in Table 115 and, for simplicity, do not consider fiber costs (ie, they assume the required fiber already exists)
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