Avaya X330WAN - Manual (Page 54)

Chapter 4 Operational Concepts and Configuration Examples
32 Avaya X330WAN User’s Guide
• LAN Interface – Fast Ethernet interface.
This interface is an autosensing 10/100Mbps Fast Ethernet port. It can be used
to connect to a LAN, to an external firewall/VPN, or to a DMZ.
• P330 Switching Fabric – FabricFastEthernet interface.
This is an internal 100Mbps connection to the P330 switching fabric. It supports
VLANs, and is compatible with the P330.
When connecting the X330WAN in Access-Router Only mode (e.g., no external
VPN or firewall), this interface is used to connect to the hosting P330 switch. If
an external firewall/VPN is connected to the Fast Ethernet port, it is important
to disable this interface to prevent a direct flow of packets from the WAN to the
LAN.
• Console Interface – Used to connect a terminal for local management, or a
modem for remote management.
Layer 2 Virtual Interfaces
The following are the X330WAN Layer 2 virtual interfaces:
•
Loopback – 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.
The Loopback interface also provides a ‘Router ID’ in the OSPF routing
protocol.
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.
• VLAN (on the FabricFastEthernet Interface) – The P330 switch can have
multiple VLANs defined within its switching fabric. X330WAN supports up to
253 VLANs that can be configured over its internal FabricFastEthernet
connection.
• Serial Interface – This is a virtual interface that is created over a portion of an
E1/ T1, or USP port.
The Serial interfaces support PPP and Frame Relay encapsulation protocols.
Note: One or more IP interfaces can be defined over each Serial, Fast Ethernet, or
FabricFastEthernet interfaces.
Figure 4.1 through Figure 4.4 provide graphic representations of the X330WAN
serial interfaces.
Figure 4.1 illustrates a Layer 1 T1 port with two Channel Groups defined. All data
from each Channel Group is encapsulated using PPP protocol, and is distributed
over the multiple IP interfaces defined for each Channel Group.