IBM PC Server 520, Руководство пользователя

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Choosing a Mode of Operation
Ÿ Software layers illustrated above the adapters indicating
software that is required to route traffic internally, running on
the server.
Cross-subnet traffic, such as traffic from Net 1 to Net 2, must be
forwarded by a router. The router can be internal to the server or
an external stand-alone device.
The advantage of the Traditional Adapter mode is that a router
restricts cross-subnet traffic to only those data packets that are
uniquely addressed to the target network. The disadvantage of this
mode is that server responsiveness might be heavily impaired due
to the burden of packet routing. This mode should be used only
when little or no cross-subnet traffic is expected.
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PC Server 520 User's Handbook for PCI/Micro Channel