KSZ9563RNXI datasheet(28/226 Pages) MICROCHIP

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KSZ9563R

DS00002419D-page 28

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4.4.2.3

Reserved Multicast Address Table

The Reserved Multicast Address Table holds 8 pre-configured address entries, as defined in Table 4-6. This table is an

optional feature that is disabled at power-on. If desired, the forwarding ports may be modified.

If a match is found in one of the tables, then the destination port is read from that table entry. If a match is found in more

than one table, static entries will take priority over dynamic entries.

4.4.2.4

Learning

The internal lookup engine updates the ALU table with a new dynamic entry if the following conditions are met:

• The received packet's source address (SA) does not exist in the lookup table.

• The received packet has no errors, and the packet size is of legal length.

• The received packet has a unicast SA.

The lookup engine inserts the qualified SA into the table, along with the port number and age count. If all four table

entries are valid, the oldest of the (up to four) dynamic entries may be deleted to make room for the new entry. Static

entries are never deleted by the learning process. If all four entries are static entries, the address is not learned but an

interrupt is generated and the table index number is made available to the interrupt service routine.

4.4.2.5

Migration

The internal lookup engine also monitors whether a station has moved. If a station has moved, it updates the ALU table

accordingly. Migration happens when the following conditions are met:

• The received packet's SA is in the table but the associated source port information is different.

• The received packet has no receiving errors, and the packet size is of legal length.

The lookup engine updates the existing record in the table with the new source port information.

TABLE 4-6:

RESERVED MULTICAST ADDRESS TABLE

Group

Address

MAC Group

Address Function

Default PORT FORWARD

Value

(defines forwarding port: P3...P1)

Default Forwarding Action

(01-80-C2-00)-00-00

Bridge Group Data

100

Forward to port 3

(management port)

(01-80-C2-00)-00-01

MAC Control Frame

(typically flow control)

000

Drop MAC flow control

(01-80-C2-00)-00-03

802.1X Port-Based

Authentication

100

Forward to port 3

(management port)

(01-80-C2-00)-00-10

Bridge Management

111

Flood to all ports

(01-80-C2-00)-00-20

GMRP

011

Flood to all ports except

port 3

(01-80-C2-00)-00-21

GVRP

011

Flood to all ports except

port 3

(01-80-C2-00)-00-02,

(01-80-C2-00)-00-04 –

(01-80-C2-00)-00-0F

100

Forward to port 3

(management port)

(01-80-C2-00)-00-11 -

(01-80-C2-00)-00-1F,

(01-80-C2-00)-00-22 -

(01-80-C2-00)-00-2F

011

Flood to all ports except

port 3

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