Chapter 7 Interfaces
USG FLEX H Series User’s Guide
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7.3.3 Internal/External LAG Add/Edit
Link Aggregation Group (LAG) is a way to combine multiple physical Ethernet interfaces into a single
logical interface. This increases uplink bandwidth. It also increases availability as even if a member link
goes down, LAG can continue to transmit and receive traffic over the remaining links.
To configure LAG, configure a link number and specify the member ports in the link. All ports must have
the same speed and be in full-duplex mode. You must configure the LAG on both sides of the link and
you must set the interfaces on either side of the link to be the same speed.
At the time of writing, up to 4 LAG interfaces can be configured on a Zyxel Device.
Ethernet interfaces available to join a LAG interface must fulfill the following criteria.
1 The interface cannot be in another LAG. If an interface is in another LAG, it is not available to join the
LAG interface until you remove the interface from the other LAG.
2 The interface cannot be in a VLAN or PPPoE. If the interfaces is bound to an interface that is in a VLAN or
PPPoE, the interface is not available to join the LAG interface until you remove the interface from the
VLAN or PPPoE.
3 The selected interface must be bound to only 1 physical port.
• If you select an interface that has no ports bound to it, you must bind a port to this interface
• If you select an interface that has more than one port bound to it, you must remove all ports but
one from this interface.
DHCP Option 60 This field appears when Role is set to External. The setting you configure here will only work
when Address Assignment is set to Get Automatically.
DHCP Option 60 is used by the Zyxel Device for identification to the DHCP server using the
VCI (Vendor Class Identifier) on the DHCP server. The Zyxel Device adds it in the initial DHCP
discovery message that a DHCP client broadcasts in search of an IP address. The DHCP
server can assign different IP addresses or options to clients with the specific VCI or reject
the request from clients without the specific VCI.
Type a string using up to 63 of these characters [a-zA-Z0-9!\"#$%&\'()*+,-./
:;<=>?@\[\\\]^_`{}] to identify this Zyxel Device to the DHCP server. For example, Zyxel-TW.
Default SNAT This field appear when Role is set to External.
Select this to have the Zyxel Device use the IP address of the outgoing interface as the
source IP address of the packets it sends out through its WAN trunks. The Zyxel Device
automatically adds SNAT settings for traffic it routes from internal interfaces to external
interfaces.
Apply Click Apply to save your changes back to the Zyxel Device.
Reset Click Reset to return the screen to its last-saved settings.
Table 62 Network > Interface > Interface > Internal/External > Add (VLAN)
LABEL DESCRIPTION
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