Router Interface Concepts; Physical Router Interfaces; Layer 2 Virtual Interfaces - Avaya G250 Administration Manual

Configuring the router

Router interface concepts

The router in the Avaya G250/G350 Media Gateway includes the following interface categories:
Physical
●
Layer 2 virtual
●
Layer 3 routing
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Physical router interfaces

The following are the physical interfaces of the G250/G350 router:
WAN Interfaces. When you add a WAN media module to the Avaya G250/G350 Media
●
Gateway, the media module provides a WAN interface. You can add one of the following
types of WAN media modules:
- The Avaya MM340 media module provides an E1/T1 WAN interface
- The Avaya MM342 media module provides a USP WAN interface
FastEthernet Interface. The
●
provides 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
PPPoE
Switching Interface. An internal 100 Mbps connection to the G250/G350 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 G250/G350 without an external VPN or firewall, Vlan 1 is used to
connect the internal G250/G350 router to the internal G250/G350 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.

Layer 2 virtual interfaces

Loopback. The Loopback interface is a virtual Layer 2 interface over which loopback IP
●
addresses are configured. The Loopback interface represents the router by an IP address
that is always available, a feature necessary mainly for network troubleshooting.
Since the Loopback interface is not connected to any physical interface, an entry in the
routing table can not have the Loopback interface's subnet as its next hop.
488 Administration for the Avaya G250 and Avaya G350 Media Gateways
on page 279.
Fast Ethernet port on the front panel of the G250/G350
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Configuring