Nokia 7330 - Figure 33 Virtual Private Routed Network; ISAM to PE Route Exchange

Virtual Private Routed Network Service
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FD 100/320Gbps NT and FX NT IHub Services Guide
3HH-11985-AAAA-TQZZA Issue: 13
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.
Figure 33 displays a VPRN network example.
Figure 33 Virtual Private Routed Network
7.2.1 ISAM to PE Route Exchange
Routing information between the ISAM and the Provider Edge (PE) can be
exchanged by the following methods:
• Static Routes
• E-BGP
• RIP
• OSPF
Each protocol provides controls to limit the number of routes learned from each CE
router.
Service
access point
VPRN
VPRN
VPRN
ISAM
7750
EMAN
Access port
VLAN (local
scope)
IES SAP
Access
port
VLAN
VRF
base
VPRN
7750
VRF base
VRF base
IP
IP
IP
IP
IP
IP
IP
IP
SAP
SAP
SAP
SAP
SAP
SAP
SAP
SAP
SAP
SAP
IP
SAP
IP
SAP
IP
SAP
IP
SAP