AR8327-AL1A-R datasheet(46/394 Pages) ETC2

46 / 394 page

46 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

46 • June 2011

COMPANY CONFIDENTIAL

2.14 Mirroring

Mirroring monitors traffic for information gathering or troubleshooting higher-layer protocol

operations. Users can specify that a desired mirrored-to port (sniffer port) receive a copy of all traffic

passing through a designated mirrored port. The AR8327 supports mirror frames that:

n Come from an ingress specified port (ingress mirroring)

n Are destined for egress-specified port (egress mirroring)

n Mirror all ingress and egress traffic to a designated port

n Mirror frames to a specific MAC address

n ACL Mirror

2.15 Rate Limiting

In triple-play applications, the switch may need to limit the rate for all frames but continue to maintain

QoS policy. The AR8327 supports ingress and egress rate limiting requirements on a per-port basis by

configuring the Port Rate Limit register.

The AR8327 can also support per port per Queue based egress rate limiting. Ingress rate limit can

include or exclude the consideration of Management frames and registered multicast frames, while

Egress rate limit can be configured to take management frames into account.

The AR8327 can limit all frames and support rate limits from 32 Kbps to 1 Gbps at 32 Kbps granularity.

The AR8327 also supports 128 counters for ACL rule based rate limits.

2.16 Broadcast Suppression

The AR8327 supports port based broadcast suppression which can include unregistered multicast,

unregistered unicast and broadcast.

2.17 IGMP/MLD Snooping

The AR8327 switch supports IPv4 IGMP snooping (v1/v2/v3 supported) and IPv6 MLD snooping. By

setting the IGMP_MLD_EN bit in the FRAM_ACK_CTRL0/1 register, the AR8327 can look inside IPv4

and IPv6 packets and redirect IGMP/MLD frames to the CPU for processing.

The AR8327 also supports hardware IGMP Join and Fast Leave functions. By setting IGMP_JOIN_EN

and IGMP_LEAVE_EN bits in the Port Control register, the AR8327 will update the ARL Table

automatically when the AR8327 receives IGMP Join or Leave packets, and then forward it to the router

port directly in the case the CPU is not acting as a router or when enabling multicast VLAN_LEAKY to

bypass multicast traffic directly from the WAN to the LAN

The hardware Join/Fast Leave supports the following packets:

1. IGMPv1 Join

2. IGMPv2/MLDv1 Join/Leave

3. IGMPv3/MLDv2 report excluding NONE or including NONE

2.17.1

IEEE 802.3 Reserved Group Addresses Filtering Control

The AR8327 supports the ability to drop/redirect/copy 802.1D specified reserved group MAC

addresses:

01-80-C2-00-00-04 to 01-80-C2-00-00-0F by

adding the address to ARL table.

2.17.2

802.1X

The AR8327 supports identifying EAPOL frames by their reserved group addresses. Combined with

port security feature, the AR8327 can implement port based or MAC based access control.

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