From the course: MPLS L3VPN Foundation and Implementation
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Addressing and routing considerations
From the course: MPLS L3VPN Foundation and Implementation
Addressing and routing considerations
- [Instructor] Welcome back to the designing MPLS L3VPN section of the MPLS L3VPN Foundation and Implementation course. This is the second video, "Addressing and Routing Considerations." By the end, you will understand how to tackle IP overlap and routing challenges in L3VPN design. Let's jump in. L3VPNs connect customer size over a shared MPLS network, but here's the catch. Customers often use the same private IP addresses, like 10.0.0.0/24. That's IP overlap. Add routing into the mix, and you have got challenges to solve. Let's break down how to handle both. First, IP overlap. Imagine two customers, VPN A and VPN B, both using 10.0.0.1 for their sites. In a regular network, that's a conflate. Traffic will collide. L3 VPNs fix this with virtual routing tables on provider edge routers. Each customer gets its own VRF, so 10.0.0.1 in VPN A stays separate from 10.0.0.1 in VPN B, no overlap, no problem. But overlap isn't just local, it's network-wide. Inter route distinguishers. An RD…
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