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    Overview of Broadband Gateway System Architecture

    The distinctive architecture of the MobileNext Broadband Gateway allows the functions of the gateway GPRS support node (GGSN) or Packet Data Network Gateway (P-GW) in 2G, 3G, and 4G architectures to combine with a typical provider edge (PE) router. Service chaining helps with scaling and lets the broadband gateway process mobile traffic without involving the Routing Engine.

    Figure 1 shows the main hardware components of the broadband gateway. This is a typical configuration: minimally, one session Dense Port Concentrator (DPC) is required and one interface DPC or Modular Port Concentrator (MPC). This configuration shows a more typical configuration for redundancy and other routing functions:

    • Routing Engines—These components exercise overall control of the chassis.
    • Fabric—The heart of the chassis, the fabric allows all of the boards to communicate.
    • Session DPCs—Also often called Service DPCs, these boards do not have external interfaces, but instead provide services for packets flowing through the system. Some session DPCs are designated anchor DPCs for control plane purposes.
    • Interface DPCs or MPCs—These boards have external interfaces and can face packet networks or the mobile network. Some of these MPCs are designated anchor MPCs for user (bearer) data flows. All interfaces can use a single IP address.

    Figure 1: The Broadband Gateway System Architecture

    The Broadband Gateway System Architecture

    An anchor session DPC is where mobile control plane functions occur for a particular subscriber. The anchor interface DPC or MPC is where the processing for a specific GPRS tunneling protocol (GTP) tunnel identifier range occurs.

    A key feature of the broadband gateway architecture is that many services can be integrated into the system. It is important to note that these services can be performed in a single pass through the device. This simplifies deployment scenarios and reduces requirements for space, latency, power, cooling, and so on. Because everything is all in one system, there are no interoperability issues and the same network management system can be used.

    The broadband gateway can support 2G, 3G, and 4G subscribers at the same time, features fully redundant hardware and resilient software, and can scale bearer and control planes separately.

    An overall resource manager watches operations concerning the resource management clients (the board in the chassis slots) and server (the active Routing Engine) on the broadband gateway.

    Note: You do not configure the resource manager for the broadband gateway. The process runs automatically.

    Published: 2011-11-18