5.6. CONCLUSION
Interdomain TE enables setting up TE LSPs across different areas and different ASs both within a single provider's network and across providers, with the same TE properties and features as intradomain TE. Along with DiffServ Aware TE, interdomain TE completes the traffic engineering solution presented in the Traffic Engineering chapter (Chapter 2). Interdomain TE tunnels are important, not just for interprovider deployments but also for enabling MPLS applications such as Layer 3 VPNs in large networks encompassing several IGP areas when the transport tunnel is RSVP-signaled.
Before we can start exploring the different MPLS applications there is one more piece of functionality that is useful for some of the advanced applications. This is point-to-multipoint LSPs, discussed in the next chapter.
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