AR8327-AL1A-R datasheet(41/394 Pages) ETC2

41 / 394 page

Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

Switch

•

41

2.10.9

VLAN Table

The AR8327 supports 4K VLAN membership table. It also supports the following commands to access

the VLAN table:

n Read one entry

n Use get next to read out whole table

n Loading and purging of an entry

n Flush all entries, flush all of one port's entries

Table 2-28 shows the VLAN table format.

2.11 Security and Port Mapping

The AR8327 supports 802.1Q security features. Its switch discards ingress frames that do not meet

security requirements and ensures those frames that do meet the requirements are sent to the

designated ports only. Levels of security can be set differently on each port, and options are processed

using the ingress frame’s VID:

Table 2-28.

VLAN Table

Bit

Name

Description

VALID

1:indicates entry is valid

0:indicates entry is empty

IVL_EN

1:indicates this vid is used to ivl

0:indicates this vid is used to svl, vid replaced by 0 when search mac

address.

LEARN_LOOKUP_DIS

1:indicates no learn and not use arl table DP calculate final DP, but use

uni flood DP as ARL DP to calculate DP

0:indicates normal operation about learn and final DP

17:4

EG_VLAN_MODE

5:4 for port0, 7:6 for port1 …17:16 for port6

2'b00: unmodified

2'b01: untagged

2'b10: tagged

2'b11: not member

PRI_ OVER_EN

Priority overwrite enable

0: keep the original VLAN priority

1: overwrite the VLAN priority with bits [2:0] of this entry

2:0

PRI

Used as frame's VLAN priority when the "PRI_OVER_EN" (bit [3]) is

set to 1.

Mode

Description

Secure

The frame is discarded if the frame’s VID is not in the VLAN table or the ingress port is not

a member of the VLAN.

The frame is allowed to exit only the ports that are members of the frame’s VLAN.

Check

The frame is discarded if the frame’s VID is not in the VLAN table.

The frame is allowed to exit only the ports that are members of the frame’s VLAN.

Fallback

If the frame’s VID is in the VLAN table, the frame can exit only ports that are members of

the frame’s VLAN. Otherwise the switch decides forwarding policy based on the port-based

VLAN. If a frame arrives untagged, the AR8327 forwards based on the port-based VLAN

even if the ingress port’s 802.1Q mode is enabled.

Disable

The AR8327 supports port-based egress, both unmodified and force untagged.

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