You have just received a nice job at a big enterprise that has multiple sites connected over their own managed MPLS Core. Each site runs EIGRP as the CE - PE routing protocol. You get the task to route some traffic in a particular way, but you cannot make it. What is missing ?Read More
Your company uses multi-vendor routing platforms (Cisco and Juniper) and has multiple sites connected via MPLS from a service provider. Each remote site has a GRE tunnel with the Headquarter (HQ) and a BGP session over this tunnel. After some security change in the network, sites that are Juniper-based behave differently than the Cisco-based ones, creating outage for the customer. What's wrong?Read More
Company ABC has multiple offices interconnected via an MPLS provider and each office runs OSPF with a separate Area number.
In one of the offices, there is an internal router that uses VRFs. You notice that some routes are not learned. Why ?
You are a network engineer of a company that provides MPLS services to more customers. Your teams tries to increase the redundancy, but instead they receive complaints that connectivity is broken. What's wrong?Read More
A pretty long post that summarizes the characteristics of OSPF protocol when using it on a CE-PE link. Read along to review its features, learn about BGP extended communities and loop prevention mechanisms for OSPF on CE-PE links.Read More