2.9. CONCLUSION
We have seen how MPLS-TE can be used to build paths with bandwidth guarantees and how paths can be made to avoid certain links by marking such links with the appropriate administrative value and excluding them from the path computation. Using the traffic-engineered path, it is possible to achieve efficient bandwidth utilization, guarantees regarding resource allocation in times of resource crunch and control over the path that the traffic is taking in the network.
However, the traffic engineering solution presented so far has three limitations:
It operates at the aggregate level across all the DiffServ classes of service and cannot give bandwidth guarantees on a per-DiffServ-class basis.
It is limited to a single IGP area and to a single AS.
It provides no guarantees for the traffic during failures.
In Chapters 4 and 5 we will see how the traffic engineering solution is extended to overcome the first two limitations, using MPLS DiffServ Aware TE and interdomain traffic engineering. In Chapter 3 we will look at mechanisms available for protection and restoration, which overcome the third limitation listed above.
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