Blog

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 [...]

The Baltimore-Washington area has been hit with several significant snow storms this winter and those storms have impacted the operations of a large metropolitan area network.  Problems range from power [...]

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 [...]

PushPhoneXML This is one of those blogs where I am wondering if I should open this can of worms.  Despite my reservations I am going to post it anyway.  I see a lot of folks in various forums asking the question:  "How can I push a background image to a…

Earlier this year I started my "Potentially Infinite Series" on What It's Like to be a NetCraftsmen.  As promised, this won't be a one and done top ten list.  A fair amount of time has passed since my original blog, so it is now time for Installment 2 (aka, Part…

I've been surprised recently by how many people have asked me about the WebEx Meeting Center for iPhone application.  It's not only clients inquiring but also just the "Average Joes" (neighbors, friends, etc).  A good example is that not too long ago, I was hanging out a neighbor's house toward…

This article continues the discussion started in a prior blog titled Configuring the Customer Side of an MPLS VPN WAN, Part 1 (of course). It can be found at MPLS and [...]

I’ve recently been doing a lot of consulting work involving variations on a common theme. The general theme is how do I configure my routers to work with the MPLS VPN [...]

After my posting about the dangers of spanning Layer 2 between data centers in my blog titled www.mplsvpn.info) asked about handling requests to span Layer 2 between data centers.  One [...]

I’ve been reading a lot of documents, looking for clarity about Non-Stop Forwarding / High Availability / Resiliency and how it interacts with Fast Re-Routing. To some extent, the more [...]

One of my friends asked me recently if he had too much redundancy. He was concerned about potential issues in having multiple equal cost paths from his Unified Communications Manager [...]