The first video in this second module of Russ White’s BGP course covers peering, including why BGP uses TCP for transport, passive and active peer, multi-hop peering, collisions, and more. Russ White is a network architect, author, and instructor. You can subscribe to the Packet Pushers’ YouTube channel for more videos as they are published. […]
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Another interesting column by Geoff Huston: performance of TCP congestion control protocols when using Low-Earth Orbit or Geosynchronous Orbit satellites for Internet access.
Another interesting column by Geoff Huston: performance of TCP congestion control protocols when using Low-Earth Orbit or Geosynchronous Orbit satellites for Internet access.
When using Cisco SD-WAN on IOS-XE, it uses tunnel interfaces to configure parameters of the implementation. There is a mapping between what interface the tunnel is sourcing from and the name of the tunnel interface. For example, if the tunnel source is GigabitEthernet0, the tunnel interface is Tunnel0, if the tunnel source is GigabitEthernet0.100, the tunnel interface is Tunnel100000. When provisioning a router and not using Zero Touch Provisioning (ZTP), you build a small bootstrap configuration that configures mandatory parameters such as Site ID, System IP, Organization Name, but also a tunnel interface to be able to connect to the controllers. It is possible to create this configuration in vManage, and hence find out the tunnel interface name, but I thought it would be interesting to do this with code and not be dependent on vManage.
In this post, I will describe the code I used and what my logic was when creating different parts of the code. In this first post I will use the code that I came up with. In the second part, my friend Rodrigo who runs an excellent Python blog ,analyzed my code and came up with improvements, which I will describe in that Continue reading
In recent years, a lot of work has been done to scale IGPs for dense topologies, making IGPs again an interesting area. In this blog post, we will look at IS-IS Flooding and how we can measure the flooding rate, and in the future post explore Dynamic Flooding and Area Proxy.
For our experiment, we will use a stripped-down topology connecting Four locations. The devices are emulated using Arista cEOS, and all devices are part of a single level2 flooding domain. Topology creation was done with the help of netsim-tools and containerlabs. So my regards go to everyone involved with the tool, as it took care of the monotonous work like IP-Addressing, wiring, and base configs.
In the above diagram, Nodes under uin1-b2
will be the primary focus of our deep dive. Node Label consists of the node name
suffix and the last octet of the loopback IP. For example:
uin1-b2-t1-r1 with LSP ID of 0000.0000.0013 is highlighted as t1-r1(13) under uin1-b2 block.
uin1-b2-t2-r1 with LSP ID of 0000.0000.0009 is highlighted as t2-r1(09) under uin1-b2 block.
Let’s do a quick IS-IS refresher. We know that IS-IS Packets are of following types:
This lesson in Russ White’s BGP course delves into synchronization within an Autonomous System (AS) and confederation within an AS. It also discusses route reflectors, including how they prevent loops, route reflector clients, route reflector multi-path, and multi-path pros and cons. Russ White is a network architect, author, and instructor. You can subscribe to the […]
The post Learning BGP Module 1 Lesson 4: Intra-AS Models And Route Reflectors – Video appeared first on Packet Pushers.
Today's Heavy Networking podcast explores two new offerings from sponsor Palo Alto Networks. First is Okyo Garde, a home wireless mesh appliance to connect and secure remote workers while reducing the management burden from IT. We also discuss a new licensing program to make provisioning bandwidth for branch and remote offices for Prisma SD-WAN simpler and more flexible.
The post Heavy Networking 630: Palo Alto Networks Introduces Okyo Garde And SD-WAN Bandwidth On Demand (Sponsored) appeared first on Packet Pushers.
Juniper Networks’ network virtualization software Contrail can now integrate with Kubernetes. Originally designed for OpenStack, Juniper calls this new version of Contrail “CN2.” Contrail is a Software Defined Networking (SDN) platform for spinning up, configuring, and managing virtual networks on compute nodes rather than traditional network hardware. Contrail enables virtualized routing, switching, load balancing, and […]
The post Juniper Extends Contrail To Kubernetes For Cloud-Native Virtual Networking appeared first on Packet Pushers.
Hey everyone. We’re excited to announce the release of Calico v3.23! Thanks to everyone in the community who contributed to the release. We could not have fitted this many improvements in without you. To view the detailed release notes, please visit us here. While we have many improvements in this release, here’s a brief overview of some of the larger features to be aware of.
Calico now supports VXLAN encapsulation for IPv6 networks. This expands our support for any users who have adopted IPv6.
We are ecstatic to announce that the Calico VPP data plane has reached beta status! A huge thanks to the VPP team for working tirelessly over the last few releases to increase stability, performance, and feature compatibility. Try it out by visiting our documentation here.
You can now install Calico networking in your AKS clusters to take advantage of all of the Calico networking features. To try it out, follow the Calico on AKS installation instructions. To learn more about using your own network plugin in AKS, see the AKS documentation here.
We have added new configuration options to allow for Continue reading
This lesson in Russ White’s BGP course gets into withdrawing a route, MRAI time, implicit withdraws, BGP Hunt, graceful restart, and other topics. Russ White is a network architect, author, and instructor. You can subscribe to the Packet Pushers’ YouTube channel for more videos as they are published. It’s a diverse a mix of content […]
The post Learning BGP Module 1 Lesson 3: How BGP Really Converges – Video appeared first on Packet Pushers.
First off, go watch this excellent video from Ken Duda of Arista at Networking Field Day 28. It’s the second time he’s knocked it out of the park when it comes to talking about code quality:
One of the things that Ken brings up in this video that I thought would be good to cover in a bit more depth is the idea of what happens to the culture of your organization, specifically code quality, when you acquire a new company. Every team goes through stages of development from formation through disagreement and finally to success and performance. One of the factors that can cause a high-performing team to regress back to a state of challenges is adding new team members to the group.
Let’s apply this lesson to your existing code infrastructure. Let’s say you’ve spent a lot of time building the best organization that has figured out and your dev teams are running like a well-oiled machine. You’re pushing out updates left and right and your users are happy. Then, you buy a company to get a new feature or add some new blood to the team. What happens when that new team comes on-board? Are they going Continue reading
When we announced Cloudflare Images to the world, we introduced a way to store images within the product and help customers move away from the egress fees met when using remote sources for their deliveries via Cloudflare.
To store the images in Cloudflare, customers can upload them via UI with a simple drag and drop, or via API for scenarios with a high number of objects for which scripting their way through the upload process makes more sense.
To create flexibility on how to import the images, we’ve recently also included the ability to upload via URL or define custom names and paths for your images to allow a simple mapping between customer repositories and the objects in Cloudflare. It's also possible to serve from a custom hostname to create flexibility on how your end-users see the path, to improve the delivery performance by removing the need to do TLS negotiations or to improve your brand recognition through URL consistency.
Still, there was no simple way to tell our product: “Tens of millions of images are in this repository URL. Go and grab them all from me”.
In some scenarios, our customers have buckets with millions of images Continue reading
Here at Cloudflare we often talk about HTTP and related protocols as we work to help build a better Internet. However, the Simple Mail Transfer Protocol (SMTP) — used to send emails — is still a massive part of the Internet too.
Even though SMTP is turning 40 years old this year, most businesses still rely on email to validate user accounts, send notifications, announce new features, and more.
Sending an email is simple from a technical standpoint, but getting an email actually delivered to an inbox can be extremely tricky. Because of the enormous amount of spam that is sent every single day, all major email providers are very wary of things like new domains and IP addresses that start sending emails.
That is why we are delighted to announce a partnership with MailChannels. MailChannels has created an email sending service specifically for Cloudflare Workers that removes all the friction associated with sending emails. To use their service, you do not need to validate a domain or create a separate account. MailChannels filters spam before sending out an email, so you can feel safe putting user-submitted content in an email and be confident that it won’t ruin your domain Continue reading
Cloudflare Email Routing has quickly grown to a few hundred thousand users, and we’re incredibly excited with the number of feature requests that reach our product team every week. We hear you, we love the feedback, and we want to give you all that you’ve been asking for. What we don’t like is making you wait, or making you feel like your needs are too unique to be addressed.
That’s why we’re taking a different approach - we’re giving you the power tools that you need to implement any logic you can dream of to process your emails in the fastest, most scalable way possible.
Today we’re announcing Route to Workers, for which we’ll start a closed beta soon. You can join the waitlist today.
When using Route to Workers your Email Routing rules can have a Worker process the messages reaching any of your custom Email addresses.
Even if you haven’t used Cloudflare Workers before, we are making onboarding as easy as can be. You can start creating Workers straight from the Email Routing dashboard, with just one click.
After clicking Create, you will be able to choose a starter that allows you to get Continue reading