Tag Addition

Learn the high-level process and how a packet appears before and after adding a VLAN tag.

If configured, the VLAN tag is added to the stripped packet of both tagged and non-tagged packets in the first L2 header. The following figure shows tag addition for a non-tagged packet.

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VLAN tag added, non-tagged frames
VLAN tage added, non-tagged frames

For a tagged frame, tag-addition is based on the existing tag. The operation is applied to the E-tag, VN-tag, or C-tag, as showin the following figure. Note the newly added C-tag.

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Tag addition, E-tag, VN-tag and C-tag frames
Tag addition, E-tag, VN-tag and C-tag frames

S-tag and double-C tag additions are no-operation (NOOP) additions, meaning it's a computer processor instruction. The following figures shows an example of tag addition forNOOP cases.

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Tag addition, NOOP for tagged frames
Tag addition, NOOP for tagged frames