Figure 33 Virtual Private Routed Network; Isam To Pe Route Exchange - Nokia 7302 Manual

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Virtual Private Routed Network Service

The ISAM uses an IGP (RIP, OSPF, ISIS) to exchange the routes of a particular CE

router with the PE routers that are attached to that ISAM. This is done in a way which

ensures that routes from different VPNs remain distinct and separate, even if two

VPNs have an overlapping address space.

In addition, ISAM uses VPRN to separate traffic from different service providers.

Each service provider has his own means to manage the IP addresses, services and

the traffic of its subscribers, even if all the routing is actually done in the scope of the

global Internet so that subscriber IP subnets never overlap.

For this, ISAMs are connected to PE routers and Edge Routers via VLANs.

Routing information between the ISAM and the Provider Edge (PE) can be

exchanged by the following methods:

Each protocol provides controls to limit the number of routes learned from each CE

displays a VPRN network example.

Virtual Private Routed Network

access point

Static Routes

3HH-11985-AAAA-TQZZA

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