VSC7511 datasheet(85/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

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

112

Frame type flag.

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

IP4

113

Frame type flag.

Set if frame is IPv4 frame

Layer-3 Information

L3_FRAGMENT

114

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

Fragments Offset > 0).

Layer 4 information cannot not be trusted.

L3_FRAG_OFS_GT0 115

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

116

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

117

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

during basic classification. See QoS, DP, and DSCP Classification,

page 53.

L3_IP4_SIP

123 32

Overloaded fields for different frame types:

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

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

IPv4 or IPv6 frame: L3_IP4_SIP = source IP address, bits [31:0]

OAM, ARP or ETYPE frame: L3_IP4_SIP = PAYLOAD[0:3]

For IPv4 or IPv6 frames, use destination IP address if

VCAP_CFG.S1_DMAC_DIP_ENA is set for ingress port.

Layer-4 Information

TCP_UDP

155 1

Frame type flag.

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

TCP

156 1

Frame type flag.

Set if frame is IPv4/IPv6 TCP frame.

L4_SPORT

157 16

TCP/UDP frame’s source port.

Table 39 •

Specific Fields for IS1 Half Key S1_NORMAL (continued)

Field Name

Bit

Width

Description

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