Peter Welcher

I’ve been seeing some network problems lately, at sites where the problem was designing the VPC and routing mix correctly. Generally, there’s plenty of room to make a mistake, the [...]

I’ve been seeing folks trying to use Cisco Nexus VPC port-channels, and it seems useful to blog about How VPC Works. Part of my goal here is to follow this [...]

We’ve all encountered situations where an application is slow and the network gets blamed. I’ve been having some fun working with our Terry Slattery on consulting work to determine why a [...]

I thought I’d write a quick note relating to performance problems, and since it is Halloween when I’m writing this, the title “Performance That Goes Bump in the Night” seems [...]

Today’s blog is about things to look out for, and some things to look at, to fix FCIP and SRDF performance problems. FCIP and SRDF are technologies used to replicate [...]

My intent today is to continue our quest for Simplicity in Network Design in a more systematic fashion, by tackling Simplicity and Layer 2.What is simple and what is not [...]

This blog discusses simplicity of network design, Segmentation and Security. It continues the series started in Designing a Medical Grade Network Using BGP with VRF-Lite for Shared Service Support CE Design [...]

I’ve been contemplating simplicity in design over the last couple of years, while doing design assessments and grappling with just what is the right design in certain situations. I’d like [...]

On April 26, 2011, I presented “What’s New in Data Center Technologies” for C-MUG in Columbia, MD. I presented a CMUG session discussing new technologies: FabricPath Fiber Channel (FC) / [...]

Virtual switching refers the the several ways in which switching has been and is evolving to adapt to and provide suitable functionality for virtual machines and blade server chassis. Virtual [...]

I’ve been pondering cloud services / cloud computing for a while. I’d like to pass along some thoughts. It happens that a reader asked a good question about https://netcraftsmen.com/blogs/entry/data-center-l2-interconnect-and-failover.html. I [...]

The topic of Data Center Interconnect at L2, and failover between data centers, seems to be a hot topic! I’d like to briefly note some of the great interaction that’s [...]