MPLS: OSPF sham-links

Introduction The provider's MPLS cloud has three routers namely - R1 (P-router), R2 (PE-R2) and R3 (PE-R3). These routers formed OSPF adjacency with one another. R2 and R3 are iBGP neighbors peering with each other's loopback address. The TTL propagation within the MPLS cloud was suppressed with no mpls ip propagate-ttl command. This is to … Continue reading MPLS: OSPF sham-links →

MPLS Layer 3 VPN

Acknowledgement Without MR.Keith Barker's 21 minutes video instruction, constructing MPLS VPN lab will take a longer time. His 21 minutes video instruction summarizes all. MR. Keith Barker has amazing skills to translate complicated concepts into simpler and easier to understand concepts. Now it is clearer to me and I believe it will be easier on … Continue reading MPLS Layer 3 VPN →

MPLS VPN: VRF

MPLS VPN building blocks 1. Virtual routing and forwarding (VRF) - This creates logical routing instance, each virtual instance is separated such that virtual instances to instances are not reachable. 2. MP-BGP - BGP is extended to distribute MPLS VPN tags. 3. IGP - OSPF or IS-IS among the MPLS LSRs. 4. MPLS - Using … Continue reading MPLS VPN: VRF →