
Additional Base Network Configuration
BIG-IP® Reference Guide 3-9
When you add an interface to a VLAN as a tagged interface, BIG-IP
associates the interface with the VLAN identification number, or tag, which
becomes embedded in a header of a packet.
Note
Every VLAN has a VLAN identification number. This identification number
is assigned to a VLAN either explicitly by a user, when creating the VLAN,
or automatically by BIG-IP, if the user does not supply one.
Each time you add an interface to a VLAN, either when creating a VLAN or
modifying its properties, you can designate that interface as a tagged
interface. A single interface can therefore have multiple tags associated
with it.
The result is that whenever a packet comes into that interface, the interface
reads the tag that is embedded in a header of the packet. If the tag in the
packet matches any of the tags associated with the interface, the interface
accepts the packet. If the tag in the packet does not match any of the tags
associated with the interface, the interface rejects the packet.
Example
Figure 3.6 shows the difference between using three untagged interfaces
(where each interface must belong to a separate VLAN) versus one tagged
interface (which belongs to multiple VLANs).
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