VSC7440 datasheet(119/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

102

NXT_OFFSET_FROM_TYPE

Move frame pointer depending on type of current protocol layer.

0: NONE. No frame pointer movement.

1: SKIP_ETH. Skip Ethernet layer.

If frame type is ETH, then move frame pointer past DMAC, SMAC

and 0-3 VLAN tags.

2: SKIP_IP_ETH - Skip IP layer and preceding Ethernet layer (if

present).

If frame type is ETH: Move frame pointer past DMAC, SMAC, 0-3

VLAN tags and IPv4/IPv6 header.

If frame type is CW and IP version is 4 or 6: Move frame pointer

past IPv4/IPv6 header.

For IPv4 header frame pointer is also moved past any IPv4

header options.

3: RSV. Reserved.

x x

NXT_TYPE_AFTER_OFFSET Protocol layer (frame_type) at frame pointer position after update

based on NXT_OFFSET_FROM_TYPE and

NXT_NORM_W16_OFFSET or NXT_NORM_W32_OFFSET.

Frame_type is only changed if one of the following conditions is

true:

a) Frame pointer is moved.

b) Frame_type going into VCAP CLM was DATA and

NXT_KEY_TYPE != 0.

0: ETH. Frame pointer points to start of DMAC.

1: CW (IP / MPLS PW CW / MPLS ACH). Frame pointer points to

MPLS CW/ACH or IP version.

2: MPLS. Frame pointer points to MPLS label.

3: DATA. “Raw” data, such as unknown protocol type.

xxxx

NXT_NORMALIZE

Instruct rewriter to strip all frame data up to current position of

frame pointer. The stripped data is not used for forwarding.

When a VCAP CLM action is processed, frame pointer is updated

before NXT_NORMALIZE is applied.

Note The rewriter can strip a maximum of 42 bytes.

xxxx

Table 65 •

VCAP CLM Actions (continued)

Field Name

Description and Encoding

Size

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