Getting the Picture
Figure 1 illustrates a sample network. As before, don't worry too much about the details of Figure 1. Basically, two types of traffic traverse the network: IP telephony and data. The boxes on the far left push these types of data into the network. When the traffic gets to the router R2, it is pushed over the logical entity called LSP123. Data is forwarded along the LSP123 path and when it reaches the router R5, it is then forwarded as raw IP traffic. The events generated are processed by the network management system at the bottom of Figure 1.
Figure 1 The example network.
As noted previously (in my earlier article), the use of such LSPs provides the operator with a high degree of control over the resources distributed across the network. To illustrate this, imagine an average telecom or private network with thousands of nodes distributed across many countries. Managing a network this size requires all the help you can get!