Small Site Multihoming with DHCP and Direct Internet Access
Cisco recently (15.6.3M2 ) resolved CSCve61996, which makes it possible to fail internet access back and forth between two DHCP-managed interfaces in two different front-door VRFs attached to consumer-grade internet service.Prior to the IOS fix there was a lot of weirdness with route configuration on DHCP interfaces assigned to VRFs.
I'm using a C891F-K9 for this example. The WAN interfaces are Gi0 and Fa8. They're in F-VRF's named ISP_A and ISP_B respectively:
First, create the F-VRFs and configure the interfaces:
ip vrf ISP_A
ip vrf ISP_B
interface GigabitEthernet8
ip vrf forwarding ISP_A
ip dhcp client default-router distance 10
ip address dhcp
interface FastEthernet0
ip vrf forwarding ISP_B
ip dhcp client default-router distance 20
ip address dhcp
The distance commands above assign the AD of the DHCP-assigned default route. Without these directives the distance would be 254 in each VRF. They're modified here because we'll be using the distance to select the preferred internet path when both ISPs are available.
Next, let's keep track of whether or not the internet is working via each provider. In this case I'm pinging 8.8.8.8 via both paths, but this health check can be whatever makes sense for your situation. So, Continue reading
Kafka Wakes Up And Is Metamorphosed Into A Database
Sometimes a database is like a collection of wax tablets that you can stack and sort through to update, and these days, sometimes it is more like a river that has a shape defined by its geography but it is constantly changing and flowing and that flow, more than anything else, defines the information that drives the business. There is no time to persist it, organize it, and then query it.
In this case, embedding a database right in that stream makes good sense, and that is precisely what Confluent, the company that has commercialized Apache Kafka, which is a …
Kafka Wakes Up And Is Metamorphosed Into A Database was written by Timothy Prickett Morgan at The Next Platform.
Startups have Screwed Up Work Culture
Dan Lyons talks about the dysfunctional side of working at a startup.
The post Startups have Screwed Up Work Culture appeared first on EtherealMind.
Worth Reading: IoT needs a paradigm shift
The post Worth Reading: IoT needs a paradigm shift appeared first on rule 11 reader.
History Of Networking – Juliusz Chroboczek – Babel Routing Protocol
Babel is a relatively new routing protocol when compared to some of the more well established options, but due to some of its design considerations, it is very well suited for routing on distributed mesh networks. Babel’s creator, Juliusz Chroboczek, joins the Network Collective team in discussing how Babel came about, some of the design decisions when creating it, and what the future looks like for this emerging technology.
Outro Music:
Danger Storm Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
The post History Of Networking – Juliusz Chroboczek – Babel Routing Protocol appeared first on Network Collective.
History Of Networking – Juliusz Chroboczek – Babel Routing Protocol
Babel is a relatively new routing protocol when compared to some of the more well established options, but due to some of its design considerations, it is very well suited for routing on distributed mesh networks. Babel’s creator, Juliusz Chroboczek, joins the Network Collective team in discussing how Babel came about, some of the design decisions when creating it, and what the future looks like for this emerging technology.
Outro Music:
Danger Storm Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
The post History Of Networking – Juliusz Chroboczek – Babel Routing Protocol appeared first on Network Collective.
IS-IS Overload Bit – Why IS-IS Overload bit is used ? What are the use cases ?
IS-IS Overload Bit – Why IS-IS Overload bit is used ? What are the use cases ? In this post, I will explain the Overload bit which is an important feature of IS-IS routing protocol. When a router which runs an IS-IS routing protocol have resource issue (CPU, Memory), device shouldn’t receive network traffic. […]
The post IS-IS Overload Bit – Why IS-IS Overload bit is used ? What are the use cases ? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.
How Accurate Is Your Protocol Analyzer?
When it comes to packet capture, a hardware analyzer will produce different results vs. a software-based tool.
A Brief Look at VMware’s Three Cloud Approaches
I’m at VMworld 2017 this week (obviously, based on my tweets and blog posts), and in the general sessions Monday and yesterday VMware made a big deal about how VMware is approaching cloud computing and cloud services. However, as I’ve been talking to other attendees, it’s become clear to me that many people don’t understand the three-pronged approach VMware is taking.
I should start out by saying that this post hasn’t been officially reviewed by VMware (none of my stuff is) and may not align with the “approved” marketing approach, so keep that in mind. This is just me speaking.
As I see it, the three cloud approaches are as follows:
- Private cloud
- VMware Cloud on AWS
- VMware Cloud Services for native cloud workloads
The first option (private cloud) is, I think, pretty much self-explanatory. VMware is offering VMware Cloud Foundation to help streamline some of the infrastructure management in this space, and then the VMware SDDC stack (vSphere, vSAN, and NSX) are layered on top. Couple that with a cloud management platform/automation platform such as OpenStack (VIO would be a good option) or vRealize Automation, and you have a private cloud. (I’m glossing over a few details, but you Continue reading
Automation Tools in Building Network Automation Solutions Online Course
A network engineer interested in attending the Building Network Automation Solutions online course sent me this question:
Does the course cover only Ansible, or does it also cover other automation tools like Python?
The course focuses on how you’d build a network automation solution. Selecting the best tool for the job is obviously one of the major challenges, and so one of the self-study modules describes various automation tools and where you could use them to build a full-blown solution.
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