Patton electronic SmartNode 4110 Series manual Integrated service access

SmartWare Software Configuration Guide 15 • Frame Relay configuration

PSTN Internet

NodeNode 2300

X.21

PVC 1

Modem

Modem

PVC 2

GW

GW

MultiMulti

ServiceService

ProviderProvider

Leased Line

Network

VPNVPN

ProviderProvider

Figure 29. Typical Integrated Service Access Scenario with dedicated PVCs

Integrated service access

The example in figure 29 shows a typical integrated service access scenario, where different service providers are accessed via permanent virtual circuits (PVCs) on Frame Relay over the serial interface of a SmartNode.

The multi service provider (MSP) offers both Internet access and voice services based on IP. The virtual private network (VPN) provider offers secure interconnections of local access networks (LAN) via its public wide area network based on IP. Since both providers are working independently, the SmartNode needs a configuration, which has two dedicated PVCs on Frame Relay. The first PVC, labeled as PVC 1, connects to the MSP access device. The second PVC, labeled PVC 2, connects to the VPN provider access device on the leased line network.

A SmartNode is working as a DTE and accesses the leased line network via a leased line modem connected to the serial interface. The hardware port protocol X.21 is used on the serial interface on slot 0 and port 0.

Devices accessing the MSP and VPN services are attached to the 100 Mbps Ethernet port 0/0 on the SmartNode. For that reason, an IP context with three logical IP interfaces bound to Ethernet port 0/0, PVC 1 and PVC 2 on serial port 0/0 as shown in figure 29 has to be configured for the SmartNode. The IP interfaces are labeled to represent the function of their configuration. Hence Ethernet port 0/0 is named lan, PVC 1 is named external since external services are accessed via this PVC, and PVC 2 is named internal to indicate the private network interconnection via this PVC.

Between the leased line modem and the SmartNode, ANSI T.617 type of LMI packets have to be exchanged. In addition, the keep-alive interval has to be set to 20 seconds. To guarantee voice quality, fragmentation is enabled on the PVC which carries voice (PVC 1) and a service profile is assigned which gives priority to voices packets.

Frame Relay configuration task list 187