VSC7440 datasheet(103/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

L4_SPORT

TCP/UDP source port.

Overloading:

OAM Y.1731 frames: L4_SPORT = OAM MEL flags, see below.

TCP_UDP is at the same time set to 1 to indicate the overloading.

OAM MEL flags:

Encoding of MD level/MEG level (MEL). One bit for each level where

lowest level encoded as zero.

The following keys can be generated:

MEL=0: 0b0000000.

MEL=1: 0b0000001.

MEL=2: 0b0000011.

MEL=3: 0b0000111.

MEL=4: 0b0001111.

MEL=5: 0b0011111.

MEL=6: 0b0111111.

MEL=7: 0b1111111.

Together with the mask, the following kinds of rules may be created:

Exact match. Fx. MEL=2: 0b0000011.

Below. Fx. MEL<=4: 0b000XXXX.

Above. Fx. MEL>=5: 0bXX11111.

Between. Fx. 3<= MEL<=5: 0b00XX111,

where ‘X’ means don’t care.

x x

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.

8x x

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.

CUSTOM2

32 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.

256

Table 62 •

VCAP CLM X8 Key Details (continued)

Field Name

Description

Size

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