Here's a topic that comes up more and more now that FabricPath is getting more exposure and people are getting more familiar with the technology: Can FabricPath be used to interconnecting data centers?
For a primer on FabricPath, see my pervious article Five Functional Facts about FabricPath
.
FabricPath has some characteristics that make it appealing for DCI. Namely, it extends Layer 2 domains while maintaining Layer 3 — ie, routing — semantics. End host MAC addresses are learned via a control plane, FP frames contain a Time To Live (TTL) field which purge looping packets from the network, and there are no such thing as blocked links — all links are forwarding and Equal Cost Multi-Pathing (ECMP) is used within the fabric. In addition, since FabricPath does not mandate a particular physical network topology, it can be used in spine/leaf architectures within the data center or point-to-point connections between data centers.
Sounds great. Now what are the caveats?
New voices gather in the Packet Pushers virtual boardroom for a discussion of Cisco’s layer 2 extension technology, Overlay Transport Virtualization (OTV). Ethan Banks hosts a recording of about two hours worth of content about OTV; this show is the first hour. Joining Ethan are first-time guests Jamie Caesar, Colby Glass and Ken Matlock. Jamie, […]
The post PQ Show 24 – Cisco OTV Deep Dive Part 1 appeared first on Packet Pushers Podcast and was written by Ethan Banks.
The other day I was called in to assist with issue that had been open for a few days. The primary reason for my involvement was to confirm network connectivity was permitted as required by a recently installed application. After an initial look, it was apparent that the application wasn’t even trying to access network […]
The post Have Respect For The Work You Do appeared first on Packet Pushers Podcast and was written by Paul Stewart.
For the past few years, many people have been suggesting that the days of IDS (intrusion detection system) are numbered. When IDS was first launched, it was seen as an answer to a lot of network security problems: deep packet inspection with constant monitoring and alerts. However, one of the biggest problems with IDS is […]
Lately I have been investigating how to monitor BGP peering session via SNMP instead of traps/syslog messages and I found out that this feature is not documented properly for IOS XR. Finally I managed to get it working, so I thought that it would be worth sharing with the community. In our example, we have […]
The post Monitoring VRFs on IOS-XR appeared first on Packet Pushers Podcast and was written by David Barroso.
This is my third and probably last installment of an ongoing story about our quest for OpenFlow 1.0 capable switches with a specific requirement - the capability to modify L3 destination addresses. The background of why Sakura Internet needs such switches for the purpose of DDoS attack mitigation is explained in my first article, along with […]
The post Centec V330: My Kind of OpenFlow Switch appeared first on Packet Pushers Podcast and was written by Tamihiro Yuzawa.
Continuning on this week's theme of Markdown, I'll be explaining how to add Markdown to your blog in 3 easy steps.
From your Wordpress dashboard, head over to the Plugins
tab and click
Add New
. Search for "WP-Markdown" and install
Once your plugin has been installed, head on down to Settings >
Writing
and scroll to the Markdown
section pictured below.
Enable Markdown wherever you like, but I'd recommend pages and posts
WARNING: Enabling Markdown will affect your existing posts/pages. I noticed that while my posts didn't look any different on the outside, behind the scenes they were a mess and required a little trying up.
Create a new post or page and practice your Markdown-Fu. Not sure where to start? Here's an example
# This is a first level heading
Here is some body text
## Second level of heading here
### And a Third
#### And so on and so forth
- Now some bullets
- Hopefully you are getting the hang of this now
- It's pretty easy
> Blockquotes are easy with Markdown Continue reading
Continuning on this week's theme of Markdown, I'll be explaining how to add Markdown to your blog in 3 easy steps.
Continuing on this week's theme of Markdown, I'll be explaining how to add Markdown to your blog in 3 easy steps.
For the last 6 months I've been using Markdown where I can. Since embarking on the path towards a more Agile approach to writing, it has been necessary to use Markdown more and more. This has led me towards using Pandoc Markdown rather than MultMarkdown as my dialect of choice and I hope to explain why.
If you haven't used Markdown already, you might be wondering what the fuss is about. Basically it is a way of writing markup in an easy-to-read, easy-to-write fashion. It decouples the act of writing from formatting/layout so the same source text can be used to produce multiple formats.
So what are the barriers to Markdown adoption? Personally I have found only two.
While I use Markdown, the rest of the company uses Microsoft Word - All of our corporate templates are in MS Word format - Neither Markdown or MultiMarkdown reliably export to MS Word format (yes MMD does ODF, but it doesn't handle images well)
The next issue is that Markdown to PDF conversion uses LaTeX. Unfortunately I neither have the time nor inclination to learn LaTeX. While it can be a powerful Continue reading
For the last 6 months I've been using Markdown where I can. Since embarking on the path towards a more Agile approach to writing, it has been necessary to use Markdown more and more. This has led me towards using Pandoc Markdown rather than MultMarkdown as my dialect of choice and I hope to explain why.
Thanks to everyone who supports Packet Pushers and supports us. We could not do this without you. Greg & Ethan go solo to talk a little about 150 weekly shows Cisco Live US 2013 – Tweet UP – http://networkingnerd.net/2013/05/23/cisco-live–2013-tweetup/ Greg has Published an eBook Greg wrote an eBook on blogging – The Arse First Guide to Technical […]
The post Show 150 – Self Congratulations, CLUS and Career Advice appeared first on Packet Pushers Podcast and was written by Greg Ferro.
I recently changed from MultiMarkdown to Pandoc. But I still wanted to use Marked app to preview my work…
Thankfully the author of Marked allowed for such an eventuality with the "Custom Processor" option.
To use this tick the box, put in your fully qualified path to pandoc and add your arguments and bob is your proverbial uncle. The quickest way to find out where pandoc is installed on your Mac is to type the following from the terminal.
which pandoc
@dave_tucker
I recently changed from MultiMarkdown to Pandoc. But I still wanted to use Marked app to preview my work…