Chapter 7 Interfaces
USG FLEX H Series User’s Guide
100
Relationships Between Interfaces
In the Zyxel Device, interfaces are usually created on top of other interfaces. Only Ethernet interfaces
are created directly on top of the physical ports or port groups. The relationships between interfaces are
explained in the following table.
IP Address Assignment
Most interfaces have an IP address and a subnet mask.
Figure 82 Example: Entry in the Routing Table Derived from Interfaces
This information is used to create an entry in the routing table.
Table 56 Relationships Between Different Types of Interfaces
INTERFACE RESTRICTION REQUIRED PORT / INTERFACE
Ethernet interface N/A physical port
VLAN interface You cannot configure a VLAN interface and an
Ethernet interface on the same port
physical port
LAG When you configure a LAG interface, you cannot set
the LAG interface on an Ethernet interface that is
already used by other interfaces.
Ethernet interface
bridge interface When you configure a bridge interface, you cannot
set the bridge interface on an interface that is
already used by other bridge or VLAN interfaces.
Ethernet interface*
VLAN interface*
trunk When you configure a trunk interface, you cannot
set the trunk interface on an interface that is already
used by other bridge or LAG interfaces.
External/General Ethernet interface
VLAN interface
LAG interface
PPPoE interface
bridge interface
PPPoE interface N/A Ethernet interface*
VLAN interface*
bridge interface
Table 57 Example: Routing Table Entries for Interfaces
IP ADDRESS(ES) DESTINATION
100.100.1.1/16 lan1
200.200.200.1/24 wan1
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