The physical interfaces of the Branch Gateway router include:
WAN InterfacesWhen you add a WAN media module to the Branch Gateway, the media module provides a WAN interface. You can add one of the following types of WAN media modules:
FastEthernet InterfaceThe 10/3 and 10/4 Fast Ethernet ports on the front panel of the Branch Gateway provide a FastEthernet interface. This interface is an autosensing 10/100 Mbps Fast Ethernet port. It can be used to connect to a LAN, an external firewall, an external Virtual Private Network (VPN), or a DeMilitarized Zone (DMZ). This interface can also be used as a WAN interface when configured for PPPoE. For more information, see Configuring PPPoE.
Switching Interface An internal 100 Mbps connection to the Branch Gateway internal switch provides a switching interface. The switching interface supports VLANs. By default, the switching interface is associated with the first VLAN (Vlan 1).
When you configure the Branch Gateway without an external VPN or firewall, Vlan 1 is used to connect the internal Branch Gateway router to the internal Branch Gateway switch. If an external firewall or VPN is connected to the Fast Ethernet port, it is important to disable Vlan 1 to prevent a direct flow of packets from the WAN to the LAN.
