7 And the IETF working group that is defining it.
320 Chapter 11
?– 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.
Figure 11.10 illustrates the application of pseudowires and MPLS in EoS networks.
Control Plane Enhancements
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 (e.g., 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.
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