IP175DLF datasheet(52/145 Pages) ETC

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IP175DLF

Datasheet

52/145

August 22, 2014

IP175DLF-DS-R10.1

3.10

CPU Interrupt Control for loop detection (for v13 or newer version)

IP175DLF uses interrupt to notify CPU of loop detection status. User can decide interrupt signal is active

high or low. This function can be enabled by programming the corresponding bit in MII registers 21.20[15]

and 21.20[3].

3.11

IGMP Snooping

IP175DLF support IGMP v1 and v2 snooping specified in RFC 1112 and RFC 2236 respectively. Because

IGMP is used between hosts and neighboring multicast routers, IP175DLF listen the IGMP message

communication between router and host to establish multicast group membership. Based on the group

membership information, IP175DLF forwards IP multicast data to its membership which registered in

group table. For hardware IGMP snooping timeout mechanism is provided by applying the hosts silently

leave a specific multicast group. “Silently Leave” means that a host does not respond to query message

when it want to leaves group. Except for hardware IGMP snooping, IP175DLF also support software

IGMP snooping and IGMP snooping with CPU assistance. Software IGMP snooping imply that software

must handle IP multicast traffic which include IGMP packet, IP multicast control packet and IP multicast

data packet and then forward it to proper output port after processing done. For IGMP snooping with CPU

assistance, it separate two parts: hardware supporting and software supporting. In hardware supporting,

the switch directly forward IGMP packets and IP multicast control packets to CPU for further processing.

Then software must process these packets and forward to proper output port. The external CPU also

must maintain the table of multicast group. When IP multicast data packet is received by a port, the switch

forward it according to this table.

IP175DLF supports not only IGMP snooping but also MLD snooping. MLD snooping does not support

hardware MLD snooping. It only supports software MLD and MLD snooping with CPU assistance. For

MLD snooping with CPU assistance, IP175DLF trap MLD packets to CPU for further processing and then

forward these packets to proper ports. CPU shall update the table of multicast group according to MLD

message. When IPv6 multicast packet is coming, it will be forwarded based on this table. For software

MLD snooping IP175DLF traps MLD and IPv6 multicast packet to CPU. CPU shall process these packets

and forward to proper ports.

3.12 Security Filtering

IP175DLF provides flexible security configuration to protect against attacks and filter suspicious traffics.

These packets can be programmed to drop or forward to CPU for further processing. The IP175DLF

provides packet filtering based on physical port, MAC address, logical port and layer 2-4 Multi-Field

packet headers.

3.12.1

Physical Port Filtering

A port can be disabled the forwarding and learning ability respectively. For instance a host connects to a

physical port directly. The security rule is that everyone shall be authenticated by an authenticating server

or administrator if he wants to access network. Administrator (or CPU) can disable forwarding and

learning ability on a given port, if a host is in unauthorized state.

3.12.2

MAC Address Filtering

The feature of MAC address filtering can be configured by two ways: specific MAC address filtering and

unknown MAC address filtering. Specific MAC address filtering allows to drop packets with specific either

source MAC address or destination. Specific MAC address filtering can also drop packet on per VLAN

group. Configuring contexts of the specific MAC address filtering is through “Address Table Access

address) can access network.

3.12.3

Logical Port Filtering

IP175DLF support discard packets based on logical port. The logical port can define a particular port

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