Posted by: Pete Welcher
on Mar 5, 2010
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 of the Layer 2 (L2) over Layer 3 (L3) techniques discussed in prior articles. Specifically, how L2 over L3 can help with server relocation and re-addressing, especially in VMotion form.
Posted by: Pete Welcher
on Mar 3, 2010
This article continues and builds upon my prior blog Understanding Layer 2 over Layer 3 (Part 1), which sets the necessary context and background. (And provides a bunch of good links!)
Posted by: Pete Welcher
on Mar 2, 2010
I've had Layer 2 on the brain for a while. Or rather, mitigating Layer 2. Several prior blog articles reflect aspects of this:
Posted by: Jim Marinelli
on Jan 25, 2010
Cisco VSS Dual-Active Detection - In my last blog, I explained how to configure VSS. In this article I’ll explain how to configure Dual-Active Detection. This is an important function of VSS because it prevents both supervisors from becoming active in event of a VSL link failure.
A VSS pair is connected by a VSL (virtual switch link). If the standby switch detects a complete loss of the VSL, it assumes the active chassis has failed and will take over as the active chassis. However, if the link has failed but the active chassis is still functioning, this can result in both chassis being in the active state. With both chassis routing packets and connected to upstream or downstream switches, black holes can occur.
Posted by: Jim Marinelli
on Dec 21, 2009
Cisco VSS Configuration - Looking to install VSS ? Well, recently I had the opportunity to install VSS in a customer’s Data Center as part of a complete network migration from an old Nortel Switch network to a new Cisco network using primarily Catalyst 6509 switches with Sup 720 – 10 G Supervisors.
Posted by: Carole Warner Reece
on Oct 5, 2009
I've been reviewing the VMware vSphere 4.0 architecture, and in the process put together the following introduction glossary.
Note: This includes just the terms I found useful this morning...
Posted by: Pete Welcher
on Aug 31, 2009
Monday 8/31/09
I've put some additional comments and updates / corrections into the Impressions #01 blog article in blue. See http://www.netcraftsmen.net/resources/blogs/vmworld-2009-impressions-01.html.
Posted by: Pete Welcher
on Aug 30, 2009
Sunday 8/30/09
Posted by: Pete Welcher
on Jul 23, 2009
I've been learning all I can about VMWare, vSphere, and Cisco 1000v, along with soaking up Cisco's ideas of data center virtualization. And reading up on cloud computing. Meanwhile, I'm going through a switch modernization project at a site that will remain nameless. Really, it could be anywhere, I've seen everything I'm about to mention before, usually several times in several different places.
Posted by: Pete Welcher
on Jun 1, 2009
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 the breadth of the vision. There are some mild feature gaps and good things to come, but overall the products look like they'll meet the increasing Layer 2 design robustness needs of customers going forward. I do still intend to apply the "beer principle" -- too much of a good thing may give you a headache!
Resources 
