VSC7511 datasheet(83/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

The following three tables provide information about how the half keys, S1_NORMAL and

S1_5TUPLE_IP4, are generated. The first table lists the common fields between the half keys.

ETYPE_LEN

Frame type flag.

Set if frame has EtherType >= 0x600 (Frame is type

encoded). Otherwise cleared (Frame is length encoded).

ETYPE

Overloaded field for different frame types:

LLC frame: ETYPE = [DSAP, SSAP]

SNAP frame: ETYPE = PID[4:3]

IPv4 or IPv6 TCP/UDP frame: ETYPE = DPORT

IPv4 or IPv6 Other frame: ETYPE = IP protocol

ARP or ETYPE frame: ETYPE = Frame’s EtherType.

Y.1731 OAM frames (EtherType = 0x8902):

ETYPE[15:8] = 0x89.

ETYPE[7]: Set if the frames was injected with masquerading.

ETYPE[6:0]: Encodes the frame’s MEG level. For more

information, see OAM_MEL_FLAGS Table 54, page 85.

To indicate the overloading of the ETYPE field, OAM_Y1731

is set to 1.

IP_SNAP

Frame type flag.

Set if frame is IPv4, IPv6, or SNAP frame.

IP4

Frame type flag.

Set if frame is IPv4 frame

Layer 3 Information

L3_FRAGMENT

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

Fragments Offset > 0).

Layer 4 information cannot not be trusted.

L3_FRAG_OFS_GT

Set if IPv4 frame is fragmented and it is not the first fragment

(Fragments Offset > 0).

Layer 4 information cannot not be trusted.

L3_OPTIONS

Set if IPv4 frame contains options (IP len > 5). IP options are

not skipped nor parsed.

Layer 4 information cannot not be trusted.

L3_DSCP

Frame’s DSCP value. The DSCP value may have been

translated during basic classification. See QoS, DP, and

DSCP Classification, page 53.

Layer 4 Information

TCP_UDP

Frame type flag.

Set if frame is IPv4/IPv6 TCP or UDP frame.

TCP

Frame type flag.

Set if frame is IPv4/IPv6 TCP frame.

Table 38 •

IS1 Common Key Fields for Half keys

Field Name

Bit Width

Description

Lookup Information

IS1_TYPE_HALF

0: S1_NORMAL entries.

1: S1_5TUPLE_IP4 entries.

Table 37 •

Specific Fields for IS1 Quad Key S1_DBL_VID (continued)

Field Name

Bit

Width Description

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