Beamforming Basics for the Wi-Fi Challenged
With every new Wi-Fi technology or standard, industry fortune tellers are quick to cast adaptive antenna arrays into an early grave. This gets a little (actually, a lot) technical, but it's required. Distinctly different from chip-based beamforming, for which every...Quiz #24 – OSPF Default-Information Originate Always
Type: Lab Difficulty: Intermediate Company ABC has multiple buildings (A, B, C and D) and two internet connections to ISP-1 (in Building-B) and ISP-2 (in Building-C). Building-A has a CORE router connected to the Border Router in Building-B (BR-B). Both BR-B and BR-C receive a default route via eBGP from the ISPs and are configured identically to inject it into the OSPF Area 0 that covers all internal routers as... [read more]QUIZ #24 – OSPF Default-Information Originate Always
Company ABC has multiple buildings and two internet connections via 2 different ISPs. Both BR-B and BR-C receive a default route via eBGP from the ISPs and they inject it in OSPF. For some reason, when ISP-1 link goes down, entire Building-A looses the internet access ! Something must be wrong...
Musing: Ethernet Connected Hard Drives, Network Designs
Ethernet Hard Drives are coming. Nothing to do with networking.
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Internets of Interest for 8th May 2014
Collection of useful, relevant or just fun places on the Internets for 8th May 2014 and a bit commentary about what I’ve found interesting about them: Whitebox Switching: Would You? Should You? — The Peering Introvert – Ethan Banks takes a good hard look at Whitebox Switches after a session at ONUG inspired some […]
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Community Show – CCDE Preparation and Recommendations
Cisco Certified Design Expert exam is the popular expert level vendor independent certification. In my first podcast I talked with my three guests who have CCDE as well , about preparation, resources, recommendations and many other topics. We also discussed whether CCIE is losing its value. Please share your comments about this podcast. Participants […]
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The post Community Show – CCDE Preparation and Recommendations appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
Community Show – CCDE Preparation and Recommendations
[player] Cisco Certified Design Expert exam is the popular expert level vendor independent certification. In this podcast Orhan Ergun – CCIE & CCDE talks with his three guests who have CCDE certificate as well , about preparation, resources, recommendations and many other topics. We also discussed whether CCIE is losing its value. Please share […]
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Cisco Live 2014 Schedule
We are just a little over a week away from Cisco Live and I think I have my schedule finalized. In case you are interested – here is my schedule for the event. When I am not in a class, there is a good chance you may find me in the Social Media Lounge. Feel […]Show 188 – Introducing A10 Networks
In this sponsored show we introduce A10 Networks and it's all about application deliver controllers, load balancers and speed like you have never seen because of smart software architecture.
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The post Show 188 – Introducing A10 Networks appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Packet pushers podcast – Hardware Resources
It’s been quite a while since I’ve posted here but I wanted to highlight some work I’ve been doing with Greg Ferro and Simon Chatterjee on the Packet Pushers podcast. We recorded a three part series where we dive deep … Continue reading
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Anycast HSRP and Design Considerations
HSRP is the first hop redundancy Cisco property protocol which allows a transparent failover of the first-hop gateway. Many technologies have been slightly modified to use it efficiently. In this article although Anycast hsrp will be explained but first I want to first explain how basically HSRP works. HSRP has Version 1 and 2. […]
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The post Anycast HSRP and Design Considerations appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
HTIRW: The Business Side of DNS (2)
</a>continued from part 1 The top level server is either paid for by the domain owner (if they are managing the TLD name space internally), or by the company contracted to manage the TLD name space. This accounts for the top level servers in our diagram. What about the thirteen root servers? These are owned […]
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Making Sense of the SDN Landscape
Making Sense of the SDN Landscape
by Brian Boyko, Technology Contributor - May 7, 2014
Understanding SDN, as a concept, is relatively simple. But understanding the SDN landscape can be difficult. Here are some of the major players in the SDN standards bodies landscape and why they're significant.
The Open Networking Foundation:
The Open Networking Foundation (ONF) is in charge of the OpenFlow standard, which defines how the control layer and delivery layer are meant to function, and the protocols for how they interact. It enables remote controllers to correctly route packets through the network, separating control from forwarding – the technological foundation of SDN. OpenFlow allows for remote administration of packet forwarding tables, and can add, modify, and remove packet matching rules and actions. ONF is a user-led organization that promotes the adoption of SDN. A number of switch and router vendors have announced to support or are shipping supported gear for OpenFlow, including Alcatel-Lucent, Big Switch Networks, Brocade Communication, Arista Networks, Cisco, Dell Force10, Extreme Networks, IBM, Juniper Networks, Larch Networks, HP, NEC, and MikroTik.
OpenDaylight Project:
OpenDaylight is a collaborative open source project hosted by The Linux Foundation. It's a consortium of about 20 Continue reading
PSA: Global IPv4 Routing Table Hits 500k Routes
Last week, the global IPv4 routing table has surpassed the 500 thousand route benchmark, according to the CIDR Report. The graph below shows its progression since the early nineties:
I last wrote about global IPv4 growth in August of 2009, when the table size was at a mere 300 thousand routes. While that benchmark was largely ceremonial, this one crosses a threshold which should may be of grave concern for many.
As has been pointed out on the NANOG mailing list, we are quickly approaching the hard forwarding plane capacity limits which exists on several very popular platforms, namely the Cisco 7600/6500 and RSP720/Sup720. The default TCAM partitioning scheme of these platforms allows for a maximum of 512 thousand IPv4 routes.
If you accept full Internet routes anywhere on your network, you'll want to verify the maximum table sizes for those platforms. On the 6500/7600 platform, the current partitioning scheme can be inspected with show mls cef maximum-routes:
Router# show mls cef maximum-routes FIB TCAM maximum routes : ======================= Current : --------- IPv4 + MPLS - 512k (default) IPv6 + IP Multicast - 256k (default)
The good news is that it's easy to repartition the default scheme (e. Continue reading
NFV and SDN – The death knell for the huge clunky routers?
Last IETF i ran into a couple of hallway discussions where the folks were having a lively debate on whether Network Function Virtualization (NFV) and Software Defined Networking (SDN) will eventually sound the death knell for huge clunky hardware vendors like Cisco, Juniper, Alcatel-Lucent, etc. I was quickly apprised about some Wall Street analyst’s report that projected a significant drop in Cisco’s revenue over the next couple of years as service providers moved to SDN and NFV solutions . I heard claims about how physical routers (that i so lovingly build in AlaLu) will get replaced by virtual routers (vRouters) and other server based software that even small startups could build. The barrier to entry in the service provider markets had suddenly been lowered and the monopoly of the big 3 was being ominously challenged. There was talk about capex spending reduction happening in the service provider networks and how a few operators were holding on to their purchase orders to see how the SDN and NFV story unfurled. There was then a different camp that believed that while SDN and NFV promised several things, it would take time before things got really deployed and started affecting capex spending and OEM’s revenues.
So whats the deal?
Based on my conversation with several Continue reading
Netvisor powers the Rackscale Architecture from Intel/Supermicro
On May 5th, 2014, we announced that Pluribus Networks Netvisor is now powering the switch blades on the new Intel blade chassis announced by Supermicro Inc. Its creating quite a stir and is a proud moment for everyone at Pluribus Networks and Supermicro who made this possible.
There are several reasons why Netvisor is the ideal Hypervisor to power the switching blades:
- Integrated Openstack Controller with Horizon and REST APIs as the only management that is needed – The entire Netvisor cluster-fabric and the virtual/physical switching on the compute blades is exported to Openstack via neutron plugins and extensions. Our Freedom series Server-Switches also bundle the full Openstack controller allowing the entire rack of microblades to be managed as one unit via Openstack Horizon GUI. For people wanting to manage the network layer via traditional tools, Netvisor also offers a full featured cli to manage teh cluster-fabric along with high performance and multithreaded native C and Java APIs. Netvisor also provides multiple virtualized services with H/W offload. So services like NAT, DNS/DHCP, IP-Pools, Routing, Load balancing, etc are integrated via Openstack Horizon to support multi-tenancy at scale.
- Netvisor is a Distributed Plug and Play Hypervisor – The Supermicro blade chassis Continue reading
Artificial Intelligence, Brains, Networks, Bugs, and Complexity
As a Computer Science graduate student in the late 70s/early 80s, I often wondered what would happen if the problems that would later come to be known as the “AI-complete” problems, which included vision, knowledge representation, natural language, and machine learning [0], were all actually solved. Would the resultant code be self-aware (whatever that means)? Would it […]
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You Won’t Get Better Internet Until Old One Is Broken. 500K BGP Routes Good Start.
Some people have pointed out the Internet BGP table is now at 500,000 IP Routes. I'm must say I'm disappointed. If you people don't hurry up and blow this to a million entries, we will never get decent routers and greater bandwidth in the carrier backbones.
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Updated DevStack OpenDaylight VM Image for OpenStack IceHouse
Here is an updated Fedora 20 image for building OpenStack Icehouse and OpenDaylight. ODL is now merged into the upcoming OpenStack Icehouse release so now you can install ODL directly from OpenStack trunk. The updated image comes from Kyle Mestery who was primarily responsible for getting the OpenStack/OpenDaylight merge and navigating the process. Thanks also to Andrew Grimberg from the ......