VSC7511 datasheet(77/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

In addition, Precision Time Protocol (PTP) frames are handled by IS2. The following encapsulations of

PTP frames are supported:

•

PTP over Ethernet:

ETYPE frame with Type/Len = 0x88F7.

Matched against MAC_ETYPE entries.

•

PTP over UDP over IPv4:

IPv4 UDP frame with UDP destination port numbers 319 or 320.

Matched against IP4_TCP_UDP entries.

•

PTP over UDP over IPv6

IPv6 UDP frame with UDP destination port numbers 319 or 320.

Matched against IP6_TCP_UDP entries.

PTP frames may be untagged, single tagged, or double tagged.

For PTP over Ethernet, the following PTP fields are always extracted:

•

TransportSpecific (byte 0)

•

MessageType (byte 0)

•

VersionPTP (byte 1)

•

DomainNumber (byte 4)

•

FlagField: flags 1, 2, and 7 (byte 6)

Note Byte 0 is the byte immediately following the EtherType, then byte 1, byte 2, and so on.

For PTP over UDP, the following PTP fields are always extracted:

•

MessageType (byte 0)

•

VersionPTP (byte 1)

•

DomainNumber (byte 4)

•

FlagField: flags 1, 2, and 7 (byte 6)

Note Byte 0 is the byte immediately following the UDP header, then byte 1, byte 2, and so on.

3.8.1

Port Configuration

This section provides information about special port configurations that control the key generation for the

VCAPs.

SNAP Frame

The Type/Len field is less than 0x600.

The Destination Service Access Point field,

DSAP is equal to 0xAA.

The Source Service Access Point field, SSAP

is equal to 0xAA.

The Control field is equal to 0x3.

Frame type flags:

ETYPE_LEN = 0

IP_SNAP = 1

MAC_SNAP

LLC Frame

The Type/Len field is less than 0x600

The LLC header does not indicate a SNAP

frame.

Frame type flags:

ETYPE_LEN = 0

IP_SNAP = 0

MAC_LLC

ETYPE Frame The Type/Len field is greater than or equal to

0x600.

The Type field does not indicate any of the

previously mentioned frame types, that is,

ARP, RARP, IPv4, or IPv6.

Frame type flags:

ETYPE_LEN = 1

IP_SNAP = 0

MAC_ETYPE

Table 33 •

IS1 and IS2 VCAP Frame Types (continued)

Frame Type

Condition

IS1 Entries

IS2 Entries

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