Peter Welcher

NetFlow is a powerful tool for exploring the data flows passing through a Cisco router or switch. Even if you do not own a commercial tool for collecting and reporting on NetFlow data, you can enable NetFlow on a device, enable it on selected interfaces, and use show commands to…

I’ve been reading up heavily on the various aspects of Cisco Nexus and Data Center technology. While I am constitutionally unable to cheerlead, I must say I’m pretty impressed with [...]

Just found this very useful page, which has links to the details of FIPS 140-2 compliance for each device supported. I was checking out wireless (controllers and APs)…

Introduction We’ve been talking about IP Multicast. This month I’m going to start covering PIM Sparse Mode. Previous articles that might be of interest: The Protocols of IP Multicast PIM [...]

Introduction This article continues the series on IP Multicast. We’ll take a look at how basic IP multicast works. We’ll then look at how PIM Dense Mode (PIM-DM) operates, how [...]

Introduction I’ve been talking about doing some articles about IP Multicast for a while. It looks like time to put up or shut up! In this article, we’ll examine the [...]