Category:   Cisco-vs-Juniper

This post represents the solution and explanation for quiz-18.
It presents different MTU values, summarizes Path MTU Discovery and gives solutions to the quiz presented a while ago.

This post represents the solution and explanation for quiz-17. For some temporary period of time, during network transition, your network consists both on Cisco and Juniper routers for the same role. You will see that they behave differently when it comes to advertising inactive BGP Routes.

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?

Your company decided to replace the existing Cisco devices with Juniper. The network team does that and configures the new Junipers as similar possible to the old Ciscos. But something does not work as intended. What is it ?