VSC7440 datasheet(96/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

L2_SMAC

Source MAC address.

ETYPE_MPLS

EtherType identifier:

0: Non-MPLS.

1: Downstream Assigned Label (EtherType = 0x8847).

2: Upstream Assigned Label (EtherType = 0x8848).

LBL0

MPLS Label Stack entry 0 - Label (Top Label).

TC0

MPLS Label Stack entry 0 - TC bits (Top Label).

SBIT0

MPLS Label Stack entry 0 - S-bit (Top Label).

TTL0_EXPIRY

Set if TTL<=1 for MPLS Label Stack entry 0.

LBL1

MPLS Label Stack entry 1 - Label.

TC1

MPLS Label Stack entry 1 - TC bits.

SBIT1

MPLS Label Stack entry 1 - S-bit.

TTL1_EXPIRY

Set if TTL<=1 for MPLS Label Stack entry 1.

LBL2

MPLS Label Stack entry 2 - Label.

TC2

MPLS Label Stack entry 2 - TC bits.

SBIT2

MPLS Label Stack entry 2 - S-bit.

TTL2_EXPIRY

Set if TTL<=1 for MPLS Label Stack entry 2.

RSV_LBL_VAL

Reserved label value. Only valid if RSV_LBL_POS > 0.

CW_ACH

The 32 bits following the label with S-bit set.

RSV_LBL_POS

Reserved label position:

0: Reserved label at position 0 seen or skipped.

1: Reserved label at position 1 seen or skipped.

2: Reserved label at position 2 seen or skipped.

3: Reserved label at position 3 seen.

4: Reserved.

5: No reserved label seen.

Label at top of stack is position 0, followed by 1, 2, and 3.

In order for a reserved label to be skipped, either

ANA_CL::MPLS_RSV_LBL_CFG[<label>].RSVD_LBL_SKIP_ENA or

ANA_CL::MPLS_MISC_CFG.CLM_RSVD_LBL_SKIP_ENA[<clm idx>]

must be set.

L3_FRAGMENT

Set if IPv4 frame is fragmented (More Fragments flag = 1 or Fragments

Offset > 0).

L3_FRAG_OFS_GT0

Set if IPv4 frame is fragmented but not the first fragment (Fragments

Offset > 0)

L3_OPTIONS

Set if IPv4 frame contains options (IP len > 5). IP options are not parsed. 1

Table 61 •

VCAP CLM X4 Key Details (continued)

Field Name

Description

Size

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