
Chapter 3
3-6
Default VLAN configuration
By default, the Setup utility configures each interface on the BIG-IP as a
member of a VLAN. The BIG-IP identifies the fastest interfaces, makes the
lowest-numbered interface in that group a member of the VLAN external,
and makes all remaining interfaces members of the VLAN internal. This
creates the mapping shown in Figure 3.5.
Figure 3.5 Default VLAN configuration
As Figure 3.5 shows, VLAN flexibility is such that separate IP networks can
belong to a single VLAN, while a single IP network can be split among
multiple VLANs. (The latter case allows the BIG-IP to be inserted into an
existing LAN without renaming the nodes.) The VLANs named external
and internal are separate networks, and in the configuration shown they
behave like separate networks. The networks belonging to VLAN internal
are also separate networks, but have been made to behave like a single
network. This is accomplished using a feature called VLAN bridging.
Your default VLAN configuration is created using the Setup utility. On a
typical unit with two interfaces, you create an internal and external VLAN.
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