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Serial port configuration task list 55
OnSite 2800 Series User Manual 4 • Serial port configuration
Figure 13. Typical Integrated Service Access Scenario with dedicated PVCs
Integrated service access
The example in figure 13 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 an OnSite router.
The multi service provider (MSP) offers both Internet access and intranet 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 OnSite 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 OnSite 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 V.35 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 OnSite
router. 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 13 has to be configured for the OnSite router. 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 OnSite router, ANSI T.617 type of LMI packets have to be exchanged.
In addition, the keep-alive interval has to be set to 20 seconds.
Node
2300
IPLink
Router
Leased Line
Network
Multi
Service
Provider
Multi
Service
Provider
VPN
Provider
VPN
Provider
Modem
Modem
Internet
V.35
PVC 1
PVC 2