In this short article, I would like to point out some similarities and differences in using passive-interface command between two link-states protocols Open Shortest Path First (OSPF) and Intermediate System to Intermediate System (IS-IS). Topology Every router has a Loopback0 configured with IP address X.X.X.X/32, where X is the router number, i.e R2 (2.2.2.2/32) Transit links are configured with IP addresses 10.X.Y.0/24, where X and Y are adjacent router numbers, i....

Acme Corporation decided to use EvilCorp to provide connectivity between their branches (Site A and Site B). They agreed to use the BGP protocol and establish a neighbor relationship between R1 (Site A) and R3 (EvilCorp) as well as R4 (Site B) and R3 (EvilCorp). There are numerous problems in the network. Would you be able to solve them to provide connectivity between client sites? Topology Every router has a Loopback0 configured with IP address X....

MPLS operations, administration, and maintenance (OAM) is a set of tools that helps to troubleshoot MPLS networks. One of the MPLS OAM tools is MPLS ping. In this article, I will describe why normal IP ping is insufficient for verifying Label Switched Path (LSP), and how MPLS ping solves that problem. Diagram Every router has a Loopback0 configured with IP address X.X.X.X/32, where X is the router number, i.e R2 (2....