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VSC7440 データシート(PDF) 123 Page - Microsemi Corporation |
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VSC7440 データシート(HTML) 123 Page - Microsemi Corporation |
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123 / 444 page  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) Y Y N N N N Tag required and frame is untagged Y N C-Tagged frames accepted [port] Frame accepted Middle TAG = S-TAG (VID > 0) Middle TAG = C-TAG (VID > 0) N N Y Y N Middle TAG = S-TAG accepted [port] Middle TAG = C-TAG accepted [port] N Y Y N N Priority S-Tagged Frame Priority S-Tagged frames accepted [port] Y Priority C-Tagged Frame Y N Priority C-Tagged frames accepted [port] Middle TAG = Priority S-TAG Y N Middle TAG = Priority S-TAG Accepted [port] N Middle TAG = Priority C-TAG Y N Middle TAG = Priority C-TAG Accepted [port] Y S-Tagged frames accepted [port] Inner TAG = S-TAG (VID > 0) Inner TAG = C-TAG (VID > 0) N N Y Y N Inner TAG = S-TAG accepted [port] Inner TAG = C-TAG accepted [port] N Y Inner TAG = Priority S-TAG Y N Inner TAG = Priority S-TAG Accepted [port] N Inner TAG = Priority C-TAG Y N Inner TAG = Priority C-TAG Accepted [port] Y Y Y Y Y Y Two VLAN tags required and frame is single or untagged Y N Three VLAN tags required and frame is single, double or untagged Y N Y Y Y Y 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 N |
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