VSC7440 datasheet(93/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

PCP1

Frame’s PCP from second tag.

DEI1

Frame’s DEI from second tag.

VID1

Frame’s VID from second tag.

TPID2

Tag protocol identifier of the frame’s third tag:

0: No third tag.

1: 0x8100.

4: 0x88A8.

5: Custom value 1.

6: Custom value 2.

7: Custom value 3.

Overloading for TRI_VID:

For OAM Y.1731 frames (ETYPE_FULL = 5) without a third tag

(TPID2 = 0), VID2[6:0] is set to 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 types of rules can 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.

PCP2

Frame’s PCP from third tag.

DEI2

Frame’s DEI from third tag.

VID2

Frame’s VID from third tag.

ETYPE_FULL

EtherType identifier:

0: IPv4frame (EtherType = 0x0800).

1: IPv6 frame (EtherType = 0x86DD).

2: Downstream assigned label (EtherType = 0x8847).

3: Upstream assigned label (EtherType = 0x8848).

4: LCC/SNAP (EtherType < 0x0600).

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

6: (R)ARP (EtherType = 0x0806 or 0x8035).

7: Other.

LBL0

MPLS Label Stack entry 0 - Label (Top Label).

TC0

MPLS Label Stack entry 0 - TC bits (Top Label).

SBIT0

MPLS Label Stack entry 0 - S-bit (Top Label).

TTL0_EXPIRY

Set if TTL<=1 for MPLS Label Stack entry 0.

Table 60 •

VCAP CLM X2 Key Details (continued)

Field Name

Description

Size

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