Chapter 1: Understanding HDSL and the Express L768/L1.5
2.IP Router: The Express L768/L1.5 can function as an IP router using the Routing Information Protocol (RIP) for advertising and learning routes among other routers. Static routes may also be entered into the routing ta- ble.
3.IPX Router: IPX routers and services can be exchanged between the Ex- press L768/L1.5 and other devices using RIP and Service Advertising Pro- tocol (SAP). Watch dog serialization filtering and spoofing can permit the ISDN to be idle during no application traffic periods.
4.Network Address Translation (NAT): Single networks can connect to the Internet with this function. The Express L768/L1.5 translates outgoing IP packets over the HDSL to the IP router at the Internet Service Provider. Many popular Internet applications are supported.
5.PPP or Frame Relay: The layer two protocol used to transfer packets can be PPP or Frame Relay (RFC 1490). PPP allows a
Routing and Bridging with the Express L768/L1.5
The Express L768/L1.5 is a Router and Transparent Learning Bridge. Its fea- tures can be easily configured and used once several basic concepts are under- stood.
Factory Default
The Express L768/L1.5 comes from the factory configured for MAC Bridging, IP routing and IPX routing with no filters or connection information defined. An IP address of 10.0.0.1 with a network mask of 255.255.255.0 is preloaded. The factory default layer two configuration is PPP, which provides the least amount of reconfiguration due to its
Bridging
In Bridge Mode, the Express L768/L1.5 can be used to connect two LAN seg- ments. In this mode, all protocols are supported because they are transported across the HDSL link at the MAC layer. The Spanning Tree Algorithm can be used to guarantee a
8 | Express L768/L1.5 User Manual |
