VSC7440 datasheet(107/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

ETYPE

Overloaded field for different frame types:

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

ETYPE = [DSAP, SSAP]

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

ETYPE = PID[4:3] from SNAP header.

TCP/UDP IPv4 or IPv6 frames (ETYPE_LEN = 1, IP_SNAP = 1,

and TCP_UDP = 1):

ETYPE = TCP/UDP destination port.

Non-TCP/UDP IPv4 or IPv6 frames (ETYPE_LEN = 1, IP_SNAP = 1, and

TCP_UDP = 0):

ETYPE = IP protocol.

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

ETYPE = Frame’s EtherType.

IP_SNAP

Frame type flag indicating that the frame is either an IP frame or a SNAP

frame.

IP frames (ETYPE_LEN = 1):

Set if (EtherType= 0x0800 and IP version = 4) or

(ETYPE = 0x86DD and IP version = 6).

SNAP frames (ETYPE_LEN = 0):

Set if LLC header contains AA-AA-03.

IP4

Frame type flag indicating the frame is an IPv4 frame.

Set if frame is IPv4 frame (EtherType = 0x800 and IP version = 4).

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

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_IP6_DIP

Destination IP address.

IPv4 frames (IP4=1):

Bits 31:0: Destination IPv4 address.

128

Table 63 •

VCAP CLM X16 Key Details (continued)

Field Name

Description

Size

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