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VLAN Packet

VLAN Packet

Created: Sep 16, 2021 06:53:52Latest reply: Sep 16, 2021 08:57:33 213 3 1 0 0
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Why VLAN Packet is limited to 12 bit for VID provides 4096 possibilities


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jason_hu
Admin Created Sep 16, 2021 07:19:07

Hi friend!
Mainly because of the structure of the two-layer data frame. According to the IEEE802.1q protocol, VLAN is identified in the data frame by the VID field information. VID is 12-bit binary field information, that is, up to the 12th power of 2 (4096) VLANs. Among them, 0 and 4095 are reserved and not enabled for the protocol, so the VLAN ID that can be divided is between 1 and 4094. VLANs from 1 to 1005 are ordinary VLANs and provide normal VLAN functions; VLANs from 1006 to 4094 are extended VLANs and provide some VLAN functions. Generally, all switches of all manufacturers default that all ports belong to VLAN 1, that is, VLAN 1 is the default VLAN.
Hope to help you!

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chenhui
chenhui Admin Created Sep 16, 2021 06:54:51

Hello,
We're working on your problem. Please be patient.
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jason_hu
jason_hu Admin Created Sep 16, 2021 07:19:07

Hi friend!
Mainly because of the structure of the two-layer data frame. According to the IEEE802.1q protocol, VLAN is identified in the data frame by the VID field information. VID is 12-bit binary field information, that is, up to the 12th power of 2 (4096) VLANs. Among them, 0 and 4095 are reserved and not enabled for the protocol, so the VLAN ID that can be divided is between 1 and 4094. VLANs from 1 to 1005 are ordinary VLANs and provide normal VLAN functions; VLANs from 1006 to 4094 are extended VLANs and provide some VLAN functions. Generally, all switches of all manufacturers default that all ports belong to VLAN 1, that is, VLAN 1 is the default VLAN.
Hope to help you!

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  • convention：
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user_3134129
user_3134129 Created Sep 16, 2021 08:57:33

Weird question. So it happened
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