FBFM2112F897CSLJLS View Datasheet(PDF) - Intel

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Description

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FBFM2112F897CSLJLS

Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip

Intel 

Intel® FM2112 24-Port 10G/1G Ethernet Switch Chip Data Sheet

3.2.8

3.2.9

Forwarding

{Described in registers Table 64}

Forwarding relay rules are fully compliant with IEEE 802.1Q-2004 (see

clause 7 for details).

Flooding

When the lookup returns an unknown destination address, the frame is

“flooded.” A flood is a normal forwarding that goes out of all switch

ports (subject to VLAN membership).

• Either a unicast address or a multicast address that is not in the table is flooded

• When a frame is flooded it is never sent to the CPU port

• If the frame is a broadcast packet, destination address = xFFFFFFFFFFFF, then the

packet is sent out of all ports and the CPU

Flooding policy on a DLF is configurable

• Flood both unicast and multicast

• Do not flood unicast (discard), flood multicast

• Do not flood unicast (discard), do not flood multicast (discard)

Discard and Monitoring: User-defined Triggers

{Described in registers Table 92 through Table 95}

In addition to the trapping, discarding, and forwarding rules described

above that implement various IEEE protocols, the Intel®Ethernet

Switch Family also contains a general set of rules for trapping,

redirecting, and discarding traffic. These rules are user programmable

and are referred to as “triggers.”

A trigger is a programmable Boolean expression. If all of the conditions

defined in the expression are true, then the trigger “fires” and one of a

programmable set of actions is taken other than the normal forwarding

of the packet.

The trigger programmable conditions are as follows:

• One MAC

— The MAC address trigger field in the MAC address table indicates this trigger

number

— If either the source address or the destination address matches, then fire the

rule. This is useful for monitoring all of the traffic between one MAC address

and the rest of the network.

• Both MAC lookup miss

• Both MAC lookup match

— The trigger field in the MAC address table indicates this trigger number

• Destination MAC address lookup match

38

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