VSC7511 datasheet(159/324 Pages) MICROSEMI

159 / 324 page

Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

144

The first 20 bytes of a frame written to a CPU injection group is an injection header containing relevant

side band information about how the frame must be processed by the switch core. The CPU ports must

be enabled to expect the CPU injection header (SYS::PORT_MODE.INCL_INJ_HDR).

On a per-frame basis, the CPU controls whether frames injected through the CPU port module are

processed by the analyzer. If the frame is processed by the analyzer, it is sent through the processing

steps to calculate the destination ports for the frame. If analyzer processing is not selected, the CPU can

specify the destination port set and related information to fully control the forwarding of the frame. For

more information about the analyzer’s processing steps, see Forwarding Engine, page 109.

The contents of the CPU injection header is listed in the following table.

Table 116 •

CPU Injection Header

Field

Bit

Width

Description

BYPASS

127

When this bit is set, the analyzer processing is skipped for this

frame. The destination set is specified in DEST and

CPU_QUEUE. Forwarding uses the QOS_CLASS, and the

rewriter uses the tag information (POP_CNT, TAG_TYPE, PCP,

DEI, VID) for rewriting actions.

When this bit is cleared, the analyzer determines the destination

set, QoS class, and VLAN classification for the frame through

normal frame processing including lookups in the MAC table and

VLAN table.

MASQ

126

When this bit is set, masquerading is enabled. The classifier,

analyzer, and queue system handle the frame as if it was

received by the ingress port specified in MASQ_PORT. This field

overloads the REW_OP field and should only be used when

BYPASS = 0.

MASQ_PORT

122

Masquerading port used when MASQ is set. This field overloads

the REW_OP field and should only be used when BYPASS = 0.

REW_OP

126

If set, frame’s source MAC address is replaced with source MAC

address configured per egress port

(SYS::REW_MAC_LOW_CFG, SYS::REW_MAC_HIGH_CFG).

VSC7511 Datasheet(PDF) 159 Page - Microsemi Corporation

VSC7511 Datasheet(HTML) 159 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL