The discussion in the comments to my LAG versus ECMP post took a totally unexpected turn when someone mentioned BFD failure detection over port channels (link aggregation groups – LAGs).
What’s the big deal?
Read more ...Want to know what the difference between Virtual Chassis and Virtual Chassis Fabric is? How Local Link Bias works? How ISSU on QFX 5100 works even though the box doesn’t have two supervisor boards? You’ll find answers to all these questions in new videos describing Juniper data center switches.
This Secret Sunday post is definitely overdue; today’s geek on the block is Plexxi’s Michael Bushong. I believe I met Mike back at Networking Field Day 5 when Plexxi presented to us. Putting aside that we were suitably impressed with Plexxi’s product … Continue reading
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Been researching HTTP2 protocol on the basis that is will, more or less, be the dominant protocol on the Internet and everywhere else. Aside from the sense of excitement I get from looking at solving old problems, HTTP2 is a huge change for networking and this site has the best explanation I’ve found so far. Check […]
The post Response: http2 explained appeared first on EtherealMind.
Earlier this week I had breakfast with a very interesting group. One of those present had an extensive history with Cisco systems. We talked about his tenure and several of the projects that he had been involved in. For some reason, one that caught my attention was the sweep option that we find in the extended Ping utility. Although it is hard to believe, there was a point in time that this gem didn’t exist.
I’ve written a few articles about the challenges of path MTU discovery and the issues that arise when it misbehaves. Today’s article looks specifically at using a ping sweep and how it can be used to quickly identifying the path MTU ceiling. The topology used for testing is simple and shown below. Notice that the two top routers are connected by a link with a lowered MTU (1492).
Let’s step through the process that an administrator might go through when a networked application isn’t working correctly. He or she would likely determine the endpoints and confirm reachability. For this example, I am testing a connection between 192.168.1.1 and 192.168.4.4. The ping command is the tool of choice for confirming reachability.
Ok, this is a stupid thing and I know I’m not the first to think it. Apple, by any chance could you please allow us to color the entries on the Favorites bar? I’d also like to request that we … Continue reading
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I have recently started working with Check Point products again, after a 5-year break. This has given me a different perspective on how they are progressing. It has been disappointing to see that they’re still suffering from some of the same old bugs. Some of the core functionality is now showing its age, and is no longer appropriate for modern networks.
When you’re using a product or technology on a regular basis, it can be hard to accurately gauge progress. Maybe it feels like there are only incremental changes, with nothing major happening. But then you come across a 5-year old system, and you realise just how far we’ve come. If you don’t think iOS is changing much, find some videos of the first iPhones.
The opposite is when it feels like there are many regular enhancements…but when you step back you see that core product issues are not dealt with. It can be hard to see this when you’re working at the coal-face. You need to step away, work with other products and systems, then return.
That’s what I’ve done with Check Point recently. Through much of the 2000s, I did a huge amount of work with Check Point firewalls. Continue reading
This week we joined thousands of thought leaders, analysts, vendors and end-users at the O’Reilly Strata + Hadoop World in New York. This event brings together the business and science of Big Data, allowing attendees to learn about emerging technologies through case studies and guest speakers. It’s been a busy week featuring excellent speakers from all over, including The New York Times and Cloudera. While we’re veterans of other industry events such as Interop and VMworld, we’re newbies here, so it’s exciting to experience this all for the first time. Judging by how things have gone so far, you can bet we’ll be back next year for more.
In this week’s PlexxiTube video of the week, Dan Backman highlights how Plexxi integrates with VMware.
Below are our best reads of the week – enjoy!
Data Center SDN growing 65% this year
In a recent article in Network World, Jim Duffy highlights the massive growth within the datacenter market – evidenced by a 65 percent growth in 2014 as reported by the Dell’Oro Group. Personally, I think it will be interesting to see if SDN survives as a separate feature out of the larger networking market. If the datacenter Continue reading
For those unable to attend AnsibleFest San Francisco, or those just looking for a copy of presentations, below you'll find links to most of them:
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Recently I've been on a search for a 'better' font to use in terminals. In an unrelated coincidence, I learned about anti-aliasing, I still don't understand it but it makes a difference.
The post Monospaced Fonts and Command Line appeared first on EtherealMind.
I wanted to take a quick moment to offer up my congratulations, and share the news about SocketPlane. Their press release announcing that they had received investment from LightSpeed Venture Partners says: SAN FRANCISCO, October 15, 2014 – Today SocketPlane, an … Continue reading
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People talking about long-distance workload mobility and cloudbursting often forget the physical reality documented in the fallacies of distributed computing. Today we’ll focus on bandwidth, in a follow-up blog post we’ll deal with its ugly cousin latency.
TL&DR summary: If you plan to spread application components across the network without understanding their network requirements, you’ll get the results you deserve.
Read more ...“Sometimes my head is a bit of an idiot” is something my daughter might say and that happens to me too, if that time is today and this article, let me know. If you don’t get the Cabbage Patch reference and its juxtaposition to automation, see here. I’ve tried to avoid sarcasm (and arrogance) but have […]
The post Automating the Cabbage Patch Network Today (2014) appeared first on Packet Pushers Podcast and was written by Steven Iveson.
On Cisco IOS, this is a very useful command "show tcp vty xx" to show TCP statistics of the VTY session. If you think your terminal is running slow because of packet loss or delay then this command will provide visibility. The other cause is the CPU/Memory running slow if you don't see any errors on the TCP (as you can see below).
The post IOS: show tcp vty appeared first on EtherealMind.
