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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

106

Figure 22 •

VLAN Acceptance Filter

The VLAN acceptance filter does not apply to untagged Layer 2 control protocol frames. They are always

accepted even when VLAN tags are required for other frames. The following frames are recognized as

Layer 2 control protocol frames:

•

Frames with DMAC = 0x0180C2000000 through 0x0180C200000F

•

Frames with DMAC = 0x0180C2000020 through 0x0180C200002F

•

Frames with DMAC = 0x0180C2000030 through 0x0180C200003F

Tagged Layer 2 control protocol frames are handled by the VLAN acceptance filter like normal tagged

frames and they must comply with the filter settings to be accepted.

Frames discarded by the frame acceptance filters are assigned PIPELINE_PT = ANA_CL and learning of

the frames’ source MAC addresses are at the same time disabled.

S-Tagged Frame

(VID > 0)

INGRESS

C-Tagged Frame

(VID > 0)

Tag required and

frame is untagged

C-Tagged

frames accepted

[port]

Frame accepted

Middle TAG =

S-TAG (VID > 0)

Middle TAG =

C-TAG (VID > 0)

Middle TAG =

S-TAG accepted

[port]

Middle TAG =

C-TAG accepted

[port]

Priority S-Tagged

Frame

Priority S-Tagged

frames accepted

[port]

Priority C-Tagged

Frame

Priority C-Tagged frames

accepted [port]

Middle TAG =

Priority S-TAG

Middle TAG =

Priority S-TAG Accepted

[port]

Middle TAG =

Priority C-TAG

Middle TAG =

Priority C-TAG Accepted

[port]

S-Tagged

frames accepted

[port]

Inner TAG =

S-TAG (VID > 0)

Inner TAG =

C-TAG (VID > 0)

Inner TAG =

S-TAG accepted

[port]

Inner TAG =

C-TAG accepted

[port]

Inner TAG =

Priority S-TAG

Inner TAG =

Priority S-TAG Accepted

[port]

Inner TAG =

Priority C-TAG

Inner TAG =

Priority C-TAG Accepted

[port]

Two VLAN tags required and

frame is single or untagged

Three VLAN tags required and

frame is single, double or untagged

These checks are available per S-tag TPID value. Four

values are supported: 0x88A8 (standard) and three

custom TPID values.

These checks are available per S-tag TPID value. Four

values are supported: 0x88A8 (standard) and three

custom TPID values.

These checks are available per S-tag TPID value. Four

values are supported: 0x88A8 (standard) and three

custom TPID values.

L2 CTRL frame

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