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Chapter 3

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Figure 3.6 Equivalent solutions using untagged and tagged interfaces

The configuration on the left shows a BIG-IP unit with three internal

interfaces, each a separate, untagged interface. This is a typical solution for

supporting three separate customer sites. In this scenario, each interface can

only accept traffic from its own VLAN.

Conversely, the configuration on the right shows a BIG-IP with one internal

interface and an external switch. The switch places the internal interface on

three separate VLANs. The interface is configured on each VLAN as a

tagged interface. In this way, the single interface becomes a tagged member

of all three VLANs, and accepts traffic from all three. The configuration on

the right is the functional equivalent of the configuration on the left.

Not only can you add a single, tagged interface to multiple VLANs, as

shown in the above example, you can also add multiple tagged interfaces to

a single VLAN.

Configuration procedures

You configure tag-based access to VLANs using either the Configuration

utility or the bigpipe vlan command. You can configure tag-based access

either when you create a VLAN and add member interfaces to it, or by

modifying the properties of an existing VLAN. In the latter case, you simply

change the status of one or more member interfaces from untagged to

tagged.

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