AR8327-AL1A-R datasheet(27/394 Pages) ETC2

27 / 394 page

Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

Switch

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27

duplex flow control mode is not set, the incoming packet is dropped if there is no buffer space

available.

2.6.3

Inter-Packet Gap (IPG)

The IPG is the idle time between any to successive packets from the same port. The typical IPG is 9.6

µs for 10 Mbps Ethernet and 960 ns for 100 Mbps Ethernet.

2.6.4

Illegal Frames

The AR8327 discards all illegal frames such as CRC error, oversized packets (length greater than

maximum length), and runt packets (length less than 64 bytes).

2.7 ACL

The AR8327 supports up to 96 ACL rule table entries. Each rule can support filtering or re-direction of

the incoming packets based on the following field in the packet.

n Source MAC address

n Destination MAC address

n VID

n EtherType

n Source IP address

n Destination IP address

n Protocol

n Source TCP/UDP port number

n Destination TCP/UDP port number

n Physical Port number

When the incoming packets match an entry in the rules table, the following action can be taken

defined in the result field.

n Change VID field

n Drop the packet

n change VID

n change priority

The AR8327/AR8327N can bind up to 4 rules to support 16*4 bytes keys and support up to 2 matches

per packet to support different functions such as ACL+Qos, ACL+routing, etc.

2.7.1

ACL Rule

The ACL rule is constructed from a packet patters, pattern mask and action. The pattern can be

defined as MAC layer or Layer 3 (IPv4 or IPv6) or user defined window.

The ACL pattern types supported by the AR8327 are listed in Table 2-5.

Table 2-5.

PatternTypes

Value

Description

MAC Pattern

IPV4 Pattern

IPV6 Pattern 1

IPV6 Pattern 2

IPV6 Pattern 3

WINDOW Pattern

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