Peter Welcher

This blog provides a link to the CMUG presentation on Cisco Overlay Transport Virtualization (OTV) I gave in Columbia, MD on 1/19/11. I have also added some supplementary info you [...]

This blog is a quick note about an easily misunderstood set of switch commands, Cisco Traffic Storm Control. The commands are very useful, and work. However, they do seem to [...]

It can be useful to have some basic information about how the various First Hop Routing Protocols (FHRP’s) work. When I read that the first release of Cisco OTV (Overlay [...]

I’ve been pondering writing a series of blogs about the topic, Data Center of the Future (“DCoF” below). The present topic, “How Many Servers?”, may be the first of that projected [...]

Two prior blogs discussed OTV, Cisco Overlay Transport Virtualization. One of those blogs pointed out some concerns one might have about optimal routing, OTV optimal routing. (My virtual machine — [...]

In this CMUG session, I discussed “Data Center Virtualization” at the April C-MUG session. We looked at the many aspects of virtualization that are relevant to the data center, sharing [...]

Carole Warner Reece and I had the pleasure last week of attending a combined Nexus 7000 and Nexus 5000 / Nexus 2000 course taught by FireFly in NJ. (http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9402/solution_overview_c22-516393_ps10110_Product_Solution_Overview.html Understanding [...]

Over the years, I’ve provided a number of customers with QoS configurations in support of IP Telephony (IPT) and IP VideoConferencing (IPVC), generally non-Cisco. I’ve been working recently with a couple [...]

This is part 3 of a series about Layer 2 over Layer 3, although I changed the titling somewhat. This blog takes a look at a very practical application of some [...]

This article continues and builds upon my prior blog http://blogs.cisco.com/datacenter/comments/data_center_interconnect/ Cisco page on DCI (with more good links): http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11_493718.html DCI Design and Implementation guide: http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_Clusters.html (contains a geoclusters chapter)

I’ve had Layer 2 on the brain for a while. Or rather, mitigating Layer 2. Several prior blog articles reflect aspects of this: https://netcraftsmen.com/working-with-eompls-part-2/ https://netcraftsmen.com/working-with-eompls.html Extended VLAN Mitigation, at https://netcraftsmen.com/extended-vlan-mitigation/ I’ve [...]

I’ve run into some interesting situations in working with customer VPNs. I am hoping a couple of them might be of general interest, and so will discuss them in this [...]