28 – VxLAN/EVPN MP-BGP in a DCI environment
VxLAN Evolution in the Context of DCI Requirements
Since I posted this article “Is VxLAN a DCI solution for LAN extension ?” clarifying why Multicast-based VxLAN was not suitable to offer a viable DCI solution, the DCI market (Data Center Interconnect) has become a buzz of activity around the evolution of VxLAN based on Control Plane (CP).
In this network overlay context, the Control Plane objective is to leverage Unicast transport while processing VTEP and host discovery and distribution processes. This method significantly reduces flooding for Unknown Unicast traffic within and across the fabrics.
The VxLAN protocol (RFC 7348) is aimed at carrying a virtualized Layer 2 network tunnel established over an IP network, hence from a network overlay point of view there is no restriction to transport a Layer 2 frame over an IP network, because that’s what the network overlays offers.
Consequently a question as previously discussed with MCAST-only transport in regard to a new DCI alternative solution, comes back again;
- Does a Control Plane suffice to claim that’s VxLAN can be used as a DCI solution?
Consequently, this noise requires a clarification on how reliable a DCI solution can be when based on VxLAN Unicast transport using a Control Continue reading
ECMP visibility with Cumulus Linux
Topology discovery with Cumulus Linux looked at an alternative Multi-Chassis Link Aggregation (MLAG) configuration and shows how to extract the configuration and monitor traffic on the network using sFlow and Fabric View.
The paper Hedera: Dynamic Flow Scheduling for Data Center Networks describes the impact of colliding flows on effective ECMP cross sectional bandwidth. The paper gives an example which demonstrates that effective cross sectional bandwidth can be reduced by a factor of between 20% to 60%, depending on the number of simultaneous flows per host.
This article uses the workbench to demonstrate the effect of large "Elephant" flow collisions on network throughput. The following script running on each of the servers uses the iperf tool to generate pairs of overlapping Elephant flows:
cumulus@server1:~$ while true; do iperf -c 10.4.2.2 -t 20; sleep 20; done
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Client connecting to 10.4.2.2, TCP port Continue reading
PlexxiPulse—Arrow IoT Immersions in Boston 3/26
Last week, we were in Santa Clara, California for Arrow Electronics’ Internet of Things Immersions conference. We demonstrated our big data fabrics, learned about Arrow’s #FiveYearsOut philosophy and conversed with innovators and thought leaders from businesses, government agencies and academia. We will be exhibiting at the last installment of the Immersions conference in Boston on March 26 at the Hynes Convention Center. Come see Plexxi in action and to talk with our team about the next era of IT. You can register to attend here. We can’t wait to see you!
Below please find a few of our top picks for our favorite news articles of the week. Have a great weekend!
Channelnomics: SDN and SDS key for CIOs – Walsh
By Jessica Meek
Software defined networking (SDN) and software defined storage (SDS) are key concerns for chief information officers (CIOs), delegates at the ITEX 2015 National Conference and Expo in Fort Lauderdale, FL heard today. In his keynote address, Lawrence M. Walsh, CEO and chief analyst at The 2112 Group, said this was a top concern for CIOs he speaks with. “CIOs consistently tell me that what’s getting them excited is SDN and SDS. This is the ability to Continue reading
Analysis: CloudFlare Keyless SSL Scales Down Internet Connections
Providing a web application on the Internet can be a risky business. DDOS attacks are commonly exceeding 40 Gigabits per second of data, crackers are web crawling the Internet looking for vulnerabilities and much more. As a result, the data centre Internet connection is scaled for a worst case scenario and not for customer need. […]
The post Analysis: CloudFlare Keyless SSL Scales Down Internet Connections appeared first on EtherealMind.
Why joining APs to a Controller Across a NAT Needs Special Configurations
Many wireless engineers know that having a lightweight AP join up to a controller across a NAT requires some extra configuration. But many don’t understand why it needs the configuration. This article will talk about what the NAT is, why it causes a problem for the normal join process, and what the configuration changes do to make things work.
What is NAT and where do we see it in the wireless world?
NAT stands for Network Address Translation, and it does pretty much what the name implies. It translates addresses from their original values to something new. Let’s take a look at a classic wireless example.
Let’s say I have an office Extend AP (OEAP) in my house, and I want it to join the WLC in my company’s DMZ. But I don’t want to actually configure a public IP on my WLC. This is where the NAT comes into play.
In the image above, the OEAP talks through the firewall in order to talk to the DMZ WLC. In order for the AP to talk to the WLC, it has to target a public IP because it needs to communicate across the Internet. So if the WLC itself doesn’t Continue reading
iPexpert’s Newest “CCIE Wall of Fame” Additions 3/13/2015
Please join us in congratulating the following iPexpert client’s who have passed their CCIE lab!
This Week’s CCIE Success Stories
- Celso Akira Myasaki, CCIE #47386 (Data Center)
- David Ratcliffe, CCIE #47463 (Wireless)
- Frederik Schon, CCIE #47321 (Wireless)
- JP Cedeno, CCIE #47408 (Routing & Switching)
- Sandeep Choudhary, CCIE #47462 (Wireless)
We Want to Hear From You!
Have you passed your CCIE lab exam and used any of iPexpert’s self-study products, or attended a CCIE Bootcamp? If so, we’d like to add you to our CCIE Wall of Fame!