Functional Overview Of The Vanguard Router Model - Motorola 110502USM001 - Vanguard 60 Router User Manual

Functional Overview of the Vanguard Router Model

Functional Overview of the Vanguard Router Model
Introduction
Logical Function
Function
IP Forwarder The IP Forwarder provides Router, Bridge, or Router-bridge functions. Data traffic from
the LAN port passes to the IP Forwarder through a virtual circuit defined by a Router
Interface (1 as shown in Figure 2-1). Depending on the IP Forwarder function configured,
the data traffic is passed to the WAN adaptor through another virtual circuit defined by
another Router Interface (5 as shown in Figure 2-1).The IP Forwarder can have multiple
virtual circuits to the WAN Adaptor.
WAN Adaptor 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. The WAN Adaptor encapsulates IP traffic for transport over the WAN. The WAN
Adaptor supports RFC 887, RFC 1294, RFC 1356, RFC 1490 multiprotocol encapsulation.
WAN Port
The Vanguard can connect to Frame Relay, X.25, MX25, ISDN, Sync PPP, or XDLC
networks.
LAN
Router
Interface
LAN
LAN
Port
IP Forwarder
- Bridge
- Router
2-2
Vanguard devices provide interconnection of LANs over WAN using a routing
model based on X.25 packet switching technology. Traffic from a LAN port passes
internally to a WAN port via a virtual circuit call. Most other bridge and router
manufacturers configure WAN links based on physical connections only.
The Vanguard routing model occurs by three logical functions as shown in
Figure 2-1 and described below:
WAN Port
Frame Relay
X.25
MX25
LAN Port
ISDN
Ethernet
Sync PPP
Token Ring
XDLC
Vanguard Router
1 5
LCON
FRI
Station
WAN Adaptor
Figure 2-1. Functional Diagram of Vanguard Routing Model
Description
WAN
FRI
WAN
Port
WAN Port
Vanguard Router
Vanguard Router
Vanguard Routing Model