is-is – security without obscurity

IS-IS, MPLS-TE, and wide metrics

I came across an interesting topic in the book Traffic Engineering with MPLS yesterday. The topic involves migration from narrow to wide metrics. As you know, wide metrics are required to support MPLS TE, so if you have a network that is currently deployed with narrow metrics (the default) you will have to migrate toContinue reading “IS-IS, MPLS-TE, and wide metrics”

Fast Convergence Techniques: IS-IS

We would be irresponsible as network designers if we did not study and appreciate IS-IS for the problems it can solve. IS-IS is a link-state protocol similar to OSPF. IS-IS uses TLVs (similar to BGP), and is thus easily extended. IS-IS and OSPF are the two choices you have when deploying TE on MPLS networks,Continue reading “Fast Convergence Techniques: IS-IS”