AR8327-AL1A-R datasheet(38/394 Pages) ETC2

38 / 394 page

38 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

38 • June 2011

COMPANY CONFIDENTIAL

2.10 VLANs

The AR8327 switch supports many VLAN options including IEEE 802.1Q and port-based VLANs. The

AR8327 supports 4096 IEEE 802.1Q VLAN groups and 4K VLAN table entries, and the AR8327 device

checks VLAN port membership from the VLAN ID, extracted from the tag header of the frame. Table

2-18 shows the AR8327-supported 802.1Q modes. The port-based VLAN is enabled according to the

user-defined PORT VID value. The AR8327 supports optional discards of tagged, untagged frames,

and priority tagged frames. The AR8327 also supports untagging of the VLAN ID for packets going

out on untagged ports on a per-port basis.

The AR8327 also support double Tagging frame which is S-Tag and C-Tag. The AR8327 can lookup the

4K VLAN table by S-Tag or C-Tag depending on the configuration mode. There are also 64 entry in

VLAN translation table supporting the VLAN operation.

2.10.1

Port-Based VLAN

The AR8327 switch supports port-based VLAN functionality used for non-management frames when

802.1Q is disabled on the ingress port. When FORCE_PORT_VLAN_EN is enabled, non-management

frames conform to port-based configurations even if 802.1Q is enabled on the ingress port. Each

ingress port contains a register that restricts the output (or egress) ports to which it can to send frames.

This port-based VLAN register has a field called PORT_VID_MEM that contains the port based

setting. If bit 0 of a port's PORT_VID_MEM is set to a one, the port is allowed to send frames to Port 0,

bit [2] for Port 2, and so on. At reset, the PORT_VID_MEM for each port is set to a value of all 1s,

except for each port's own bit, which clears to zero. Note that the CPU port is port 0.

2.10.2

802.1Q VLANs

The AR8327 supports a maximum of 4096 entries in the VLAN table. The device supports 4096 VLAN

ID range from 0 to 4095. The AR8327 supports both shared and independent VLAN learning (SVL and

IVL). This means that forwarding decisions are based on the frame's destination MAC address, which

should be unique among all VLANs.

2.10.3

VLAN Security

The AR8327 will check the ingress packets base on the VLAN operation mode and decide forward or

drop the packets. There are two sets of configuration. One is the Ingress VLAN Mode. Another is

802.1Q Mode. The Ingress VLAN Mode is checking the ingress frame is tagging or not. The 802.1Q

FULL_LIGHT_EN

1’b0

HALF_LIGHT_EN

1’b0

POWER_ON_LIGHT_EN

1’b1

LINK_1000M_LIGHT_EN

1’b1

1’b0

LINK_100M_LIGHT_EN

1’b0

1’b1

1’b0

LINK_10M_LIGHT_EN

1’b0

1’b1

COL_BLINK_EN

1’b0

Reserved

1’b0

RX_BLINK_EN

1’b1

TX_BLINK_EN

1’b1

Reserved

1’b0

LINKUP_OVER_EN

1’b1

1:0

LED_BLINK_RFREQ

1’b01: 4Hz

Table 2-22.

LED Rule Default Value (continued)

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