AR8327-AL1A-R datasheet(42/394 Pages) ETC2

42 / 394 page

42 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

42 • June 2011

COMPANY CONFIDENTIAL

In these application cases, the ports work as:

In application case 1, all LAN ports can directly send frames to each other but not to the WAN port.

The CPU can send frames to all ports. A LAN port must go through the CPU port to send frames to the

WAN port. Similarly, the WAN port must also go through the CPU to send frames to LAN ports,.

Normally a firewall application runs in the CPU, causing traffic between the LANs and WAN to go

through the host CPU. Figure 2-2 shows application case 1.

In application case 2, the WAN port is isolated from other ports, so the switch is a five-port switch with

an independent PHY. Figure 2-3 shows application case 2.

Port Number

Description

Port 0

CPU Port

Port 1

LAN A

Port 2

Port 3

LANB

Port 4

Port 5

WAN Port

Figure 2-2.

Application Case 1

Figure 2-3.

Application Case 2

Port

LAN A

LAN B

CPU

Port

WAN

Port

LAN A

Port

LAN A

LAN B

CPU MAC 1

Port

WAN

Port

LAN A

Port

CPU

MAC 2

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