VSC7440 datasheet(114/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

FWD_TYPE: LBL_SWAP

Swap label at position NUM_VLD_LABELS.

Any label above the swap label are popped.

NXT_NORM_W16_OFFSET or NXT_NORM_W32_OFFSET

must be set to move frame pointer to swap label.

NUM_VLD_LABELS must be set to the position of the swap

label.

NXT_NORMALIZE must be set to 1 to have MPLS Link Layer

and, possibly, labels stripped.

NXT_TYPE_AFTER_OFFSET must be set to MPLS.

OAM PDUs are not detected, though frames with reserved label

values as well as frames with TTL expiry can be redirected to

CPU.

FWD_TYPE: LBL_POP

Pop labels.

NXT_NORM_W16_OFFSET or NXT_NORM_W32_OFFSET

must be set to move frame pointer past popped labels.

NUM_VLD_LABELS must be set to the position of the deepest

label to be popped.

NXT_NORMALIZE must be set to 1.

NXT_TYPE_AFTER_OFFSET should normally be set to MPLS.

NXT_TYPE_AFTER_OFFSET may be set to CW when

terminating LSP with IP frames for CPU processing.

MPLS_OAM_TYPE can be set to 0, 5, or 6 to disable/enable

OAM PDU detection.

FWD_TYPE: CTRL_PDU

MPLS_OAM_TYPE controls PDU type (as encoded in

IFH.ENCAP.PDU_TYPE):

0: NONE.

1: OAM_Y1731.

2: OAM_MPLS_TP.

3: PTP.

4: IP4_UDP_PTP.

5: IP6_UDP_PTP.

6: Reserved.

7: SAM_SEQ.

OAM_Y1731_SEL controls PDU_OFFSET:

0: No change to PDU offset.

1: ETH_PAYLOAD.

2: IP_PAYLOAD.

3: Non-normalized offset (PDU_OFFSET = difference between

normalized and non-normalized payload).

Table 65 •

VCAP CLM Actions (continued)

Field Name

Description and Encoding

Size

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