VSC7440 datasheet(97/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

L3_DSCP

By default DSCP from frame. Per match, selectable to be current

classified DSCP (ANA_CL::ADV_CL_CFG.USE_CL_DSCP_ENA).

L3_IP4_DIP

IPv4 frames: Destination IPv4 address.

IPv6 frames: Destination IPv6 address, bits 31:0.

L3_IP4_SIP

Overloaded field for different frame types:

LLC frames (ETYPE_LEN = 0 and IP_SNAP = 0):

L3_IP4_SIP = [CTRL, PAYLOAD[0:2]]

SNAP frames (ETYPE_LEN = 0 and IP_SNAP=1):

L3_IP4_SIP = [PID[2:0], PAYLOAD[0]]

IPv4 frames (ETYPE_LEN=1, IP_SNAP=1, and IP4=1):

L3_IP4_SIP = source IPv4 address

IPv6 frames (ETYPE_LEN=1, IP_SNAP=1, IP4=0):

L3_IP4_SIP = source IPv6 address, bits 31:0

Other frames (ETYPE_LEN=1, IP_SNAP=0):

L3_IP4_SIP = PAYLOAD[0:3].

L3_IP_PROTO

IPv4 frames (IP4=1): IP protocol.

IPv6 frames (IP4=0): Next header.

L4_RNG

Range mask. Range types: SPORT, DPORT, SPORT or DPORT, VID,

DSCP, custom.

Input into range checkers is taken from frame except DSCP value which

is the remapped DSCP value from basic classification.

IP_PAYLOAD_5TUPLE Payload bytes after IP header. IPv4 options are not parsed so payload is

always taken 20 bytes after the start of the IPv4 header.

CUSTOM4

15 bytes payload starting from current frame pointer position, as

controlled by VCAP CLM actions.

Note that if frame_type==ETH, then payload is retrieved from a position

following the Ethernet layer, for example, after DMAC, SMAC, 0-3 VLAN

tags and EtherType.

120

Table 61 •

VCAP CLM X4 Key Details (continued)

Field Name

Description

Size

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