VSC7511 datasheet(127/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

112

In addition, the MAC table flag MAC_CPU_COPY is processed. If MAC_CPU_COPY is set, the

CPUQ_CFG.CPUQ_MAC is added to CPUQ.

The processing of this flag can be disabled through AGENCTRL.IGNORE_DMAC_FLAGS.

Next, CPU-forwarding from the basic classifier, and the IS2 SMAC_SIP lookup is processed if:

•

The basic classifier decided to copy the frame to the CPU, the corresponding CPU extraction queue

is added to CPUQ.

•

The basic classifier decided to redirect the frame to the CPU, DEST is cleared and the

corresponding CPU extraction queue is added to CPUQ.

•

The IS2 SMAC_SIP result decided to copy the frame to the CPU

(SMAC_SIP_ACTION.CPU_COPY_ENA), the corresponding CPU extraction queue,

SMAC_SIP_ACTION.CPU_QU_NUM is added to CPUQ.

•

The IS2 SMAC_SIP result decided to discard the frame (SMAC_SIP_ACTION.FWD_KILL_ENA

set), DEST is cleared.

For more information about frame type definitions for CPU forwarding in the basic classifier, see

Table 32, page 59.

3.9.3.2

VLAN Analysis

During the VLAN analysis step, VLAN configuration is taken into account. As a result, ports can be

removed from the forwarding decision. For more information about VLAN configuration, see VLAN Table,

page 108.

The following table lists the registers associated with VLAN analysis.

IPv6 multicast control

DMAC = 0x333300000000 to 0x3333FFFFFFFFF

EtherType = IPv6

IPv6 DIP inside 0xFF02::/16

Broadcast

DMAC = 0xFFFFFFFFFFFFFF

non-IPv4-multicast-data

non-IPv6-multicast-data

non-IPv4-multicast-control

non-IPv6-multicast-control

Multicast

Bit 40 in DMAC = 1

non-broadcast

non-IPv4-multicast-data

non-IPv6-multicast-data

non-IPv4-multicast-control

non-IPv6-multicast-control

Unicast

Bit 40 in DMAC = 0

Table 86 •

VLAN Analysis Registers

Description

Replication

VLANMASK

If PPORT is set in this mask, and PPORT is not member

of the VLAN to which the frame is classified, DEST is

cleared. This is also called VLAN ingress filtering.

None

PORT_CFG.RECV_ENA If this bit is cleared for PPORT, forwarding from this port to

other front ports is disabled, and DEST is cleared.

Per port

PGID[91:80]

Source port mask. Port mask per port, which specifies

allowed destination ports for frames received on PPORT.

By default, a port can forward to all other ports except

itself.

Per port

Table 85 •

Forwarding Decisions Based on Flood Type (continued)

Frame Type

Condition

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