Routed Bridge Encapsulation (RBE)
This section describes the end-to-end ADSL architecture using RBE. This RFC 2684-based technique preserves the simplicity and lowest cost of IRB, including the existing legacy remote modem deployment. It adds the benefits of Layer 3 functionality. Although RBE has its own disadvantages, it is still preferable to IRB.
Service providers are opting for RFC 2684 bridging using RBE or are moving toward PPPoA or PPPoE, which are highly scalable and very secure, although more complex and difficult to implement. RBE can use the existing IRB CPE that would otherwise be too expensive and time-consuming to replace, and migration from IRB is transparent to the end user, requiring no changes to the ATU-R configurations. Even ...
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