IBM 9077 ユーザーズマニュアル

IBM 9077 SP Switch Router: Get Connected to the SP Switch

Figure 8. Conventional Routers

The SP Switch Router provides near wire-speed packet forwarding while
using standard routing protocols. This ensures interoperability with other
network technologies and does not require a specific network architecture,
such as ATM. It works equally well in large and small networks. At each hop
where a routing switch is used, routes are processed at Layer 3 but the
packet is forwarded at Layer 2 (see Figure 9 on page 15). In the case of the
SP Router, the route processing is done through hardware, so all processing
is done at near-wire speed.

Router

Unswitched Data

Switched Data

Disadvantages:

Shared data paths
All processing done on Layer 3
Slow softwarebased processing

Layer 3

Layer 2

Router

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Process
Packets