VSC7440 datasheet(34/444 Pages) MICROSEMI

tên linh kiện	VSC7440

Giải thích chi tiết về linh kiện	L2/L3 Enterprise Gigabit Ethernet Switch with 10 Gbps Links

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

DST when

FWD.DST_MODE is

ENCAP

TYPE_AFTER_POP

134:133

2 bits

0: ETH - Normal Ethernet header, starting

with DMAC.

1: CW.

First 4 bits:

4: IPv4 header.

6: IPv6 header.

Others: MPLS CW (see RFC 4385)

2: MPLS. MPLS shim header follows.

W16_POP_CNT

132:128

5 bits

Number of WORD16 (= 2 bytes) to be

popped by rewriter, starting from

beginning of frame.

DST when

FWD.DST_MODE is

“L3UC”

RSV

191:183

9 bits

Reserved field. Must be set to 0.

ERLEG

182:176

7 bits

Egress router leg.

NEXT_HOP_DMAC

175:128

48 bits

Next hop DMAC. Only used for unicast

routing.

DST when

FWD.DST_MODE is

“L3MC”

RSV

191:152

40 bits

Reserved field. Must be set to 0.

L3MC_GRP_IDX

151:142

10 bits

IP multicast group used for L3 multicast

copies.

ERLEG

141:135

7 bits

Egress router leg.

COPY_CNT

134:128

7 bits

Number of multicast routed copies. Only

used for multicast routing.

VSTAX

127:48

80 bits

VStaX. See VStaX Header, page 20.

Table 2 •

Internal Frame Header Fields (continued)

Field Category

Field Name

Bit

Width

Description

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