Wan Adapter - Motorola 110502USM001 - Vanguard 60 Router User Manual

WAN Adapter

WAN Adapter
Introduction
What is an LAN
Connection -
LCON?
LAN Protocols
WAN Adaptor
Interconnections
2-4
The WAN Adapter is the logical function that connects the IP Forwarder to the WAN
ports. Specifically, the WAN Adaptor:
• Implements the LAN connection (LCON)
• Performs the WAN encapsulation
• Establishes the remote connections using SVCs or PVCs
• Collects and maintains statistics on each remote LAN connection
• Controls data flow
The WAN Adaptor connects the IP Forwarder to the WAN ports via a virtual circuit
called the LAN Connection, LCON. LCONs uses X.25 based addressing to establish
virtual circuits.
LAN protocols serve two purposes:
• Access termination such as traditional serial protocols
• Routing LAN data along proper WAN paths
The Vanguard WAN Adapter allows Vanguard LAN software to implement a more
efficient layer of routing.
An overlay network that the LAN routing functions see is superimposed on top of
the actual virtual circuit network and physical network implemented by the Motorola
access devices.
Figure 2-2 shows how the WAN Adapter is used to provide a LAN overlay network.
SVC
PVC
X.25
Stack
X.25 Port
FR-DCE Port
Figure 2-2. WAN Adapter Interconnections
Up To 2000
Connections
WAN Adapter
SVC
Up To 250
Bridge
Links
X.25
Stack
Bridge
Handler
FR-DTE Port LAN Port
Up To 254
Router
Interfaces
Router
Vanguard Routing Model