9.5. CONCLUSION
The L3VPN solution supports VPNs spanning across several ASs, as well as VPN hierarchies. The key to achieving these in a scalable manner is the use of MPLS tunnels. The tunnels are built by stitching together several tunnel segments using either BGP or LDP. Having covered these advanced deployment scenarios, this chapter concludes the discussion on the support of unicast traffic in BGP/MPLS L3VPN. In the next chapter, we will look at the evolution of solutions for multicast support in VPNs.
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