Anycast load balancing. All the routers use Quagga for BGP. Google Cloud Load Balancing is implemented as a single Anycast IP, which provides cross-region load balancing and automatic multi-region failover. Moving Anycast routing configuration to a managed load balancer service minimizes the work and complexity required for service configuration while providing them with fast, automatic, distance aware failover. It explores how both technologies utilize a single DNS hostname for applications, enhancing Nov 6, 2018 · Popular tools for global load balancing are the distributed Internet systems, DNS and (anycast) routing. Nov 26, 2024 · Load sharing is usually described as the process of farming out traffic to a number of servers without knowing in advance how busy those servers are: thus there could be a traffic imbalance between them. Mar 18, 2025 · Abstract Load Balancing (LB) is a routing strategy that increases performance by distributing traffic over multiple outgoing links. From load balancing to optimized latency to automatic failover, anycast helps make the most important parts of the internet extremely reliable and high performing. Static anycast global Jun 7, 2024 · Load Balancing: Anycast can also provide load balancing. Anycasting is commonly used to load-balance between geographically dispersed servers. Instant global failover to the next optimal regional deployment. Unicast vs Anycast DNS Routing Jan 16, 2024 · Using anycast or other DNS mechanisms, global server load balancing (GSLB) forwards requests to the nearest available data center. In this work, we introduce a novel methodology to detect the influence of LB on anycast routing, which can be used by operators to detect network regions that experience anycast routing instability. Ability to scale up/down behind a single endpoint. At CloudFlare, we've done a significant amount of engineering to allow TCP to run across Anycast without flapping. This scenario is typical for anycast IP routing environments with host-based networking where the same anycast or virtual IP is learned from multiple sources. Sep 17, 2025 · Learn how to implement anycast routing to advertise the same route from different regions using Azure Route Server for improved application availability and performance. Feb 20, 2025 · Azure Standard Load Balancer supports global load balancing enabling geo-redundant high availability scenarios such as: Incoming traffic originating from multiple regions. Revised existing load balancer infrastructure from a Layer 4 load balancer connected to a set of virtual machines, to a Layer 7 load balancer connected to a Kubernetes service. We use our methodology to measure the effects of LB-behavior on An IPv6 anycast address is like any unicast address that is assigned to more than one interface (typically belonging to different nodes) where a packet sent to an anycast address is routed using the preferred route from the routing table. To increase reliability, Load Balancers are usually deployed in High Availability pairs, and we assume this to be the case throughout this paper. Jul 25, 2023 · Anycast also makes DNS services much more reliable and resilient. Anycast is a network addressing and routing method in which incoming requests can be routed to a variety of different locations. A regular Load Balancing scenario would look like Drawing 1. Mar 6, 2013 · For simple protocols like UDP that don't maintain state, Anycast is ideal and it has been used widely to load balance DNS for some time. The subject of load balancing across Azure regions is a common topic within application design in the Cloud. Jul 15, 2025 · To meet those expectations, many teams turn to technologies like Geo-DNS, Anycast, and Global Server Load Balancing (GSLB). Oct 3, 2024 · Beyond DNS: Implementing Anycast in Azure with Route Server and NVAs What to do about global site load balancing. Redundancy and Failover: Anycast offers built-in redundancy and failover capabilities. If multiple endpoints are equally suitable for handling a request, the network routers distribute incoming traffic evenly among these endpoints to prevent overloading a single one. Oct 13, 2025 · With Cloud Load Balancing, a single anycast IP address is the frontend for all of your backend instances in regions around the world. Mar 20, 2024 · Learn how anycast can improve your infrastructure’s availability, performance, resiliency, and security — all at the network level. Introduction: The Evolution of Global Load Balancing Global failover between regional … Dec 23, 2024 · Anycast relies on BGP announcements to direct traffic to the nearest server, but BGP is not inherently designed for fine-grained load balancing or performance optimization. Feb 4, 2025 · Anycast DNS works by using multiple DNS servers for faster performance. This video provides a detailed comparison between Anycast and Global Server Load Balancing (GSLB). But which approach offers the best global performance? Feb 13, 2023 · Anycast DNS works by using routing protocols such as Border Gateway Protocol (BGP) to send DNS queries to a preferred DNS server or group of DNS servers (for example: a group of DNS servers managed by a load balancer). There are two ways this architecture can be achieved: IP/ BGP based anycast service: Explicitly design and leverage IP/ BGP technologies to implement anycast load balancing functionality Apr 4, 2023 · Global Load Balancing (GSLB, Anycast) Mesh global infrastructure provides initial network-level load-balancing using anycast to all VitualHosts hosted by F5 Distributed Cloud's network cloud or enterprises private/public and edge clouds. May 9, 2024 · With Anycast DNS, when a user requests a website, the DNS query is directed to the nearest available server based on network topology, latency, and other factors. Learn how Anycast works. Anycast uses sophisticated algorithms to deploy load-balancing. Feb 6, 2019 · For eg: if the Anycast instance is broken mid-way for some reason, the network devices need to open a TCP connection to PSN first before sending traffic. In some cases, routing decisions made by BGP may not align perfectly with user expectations, leading to suboptimal paths or increased latency. . With Anycast IP network, a single IP is allocated for serving the incoming request and the request is routed to the nearest Google server region/location. DNS resolves a name to regional IP addresses on the appropriate continent. It has numerous advantages like improved network latency and automatic load balancing. It then distributes loads within that data center. Introduction The most natural way to think about Load Balancing, is to put as many service replicas as required in your server room, and have a Load Balancer distribute the load amongst them. Given how many requests it takes to resolve a single URL, this becomes even more important as DNS services scale globally. Oct 5, 2021 · Anycast-Based approaches Anycast-based approaches refer to an architectural pattern in which many servers advertise the same IP and a router can route packets to these locations via different network paths. 5 days ago · Abstract Load Balancing (LB) is a routing strategy that increases performance by distributing traffic over multiple outgoing paths. Feb 21, 2017 · In anycast, a collection of servers share the same IP address and send data from a source computer to the server topographically closest, cutting latency, bandwidth costs, improving load time and availability. 💡 Looking for an Anycast design based on Azure Virtual WAN instead? Click here. By providing built-in DDoS mitigation and load balancing, the likelihood of an entire service going down completely becomes much lower. Often in the context of providing HA or DR for an application hosted in Azure, but also for purposes of load Anycast load balancing mitigates these risks as it is a routing methodology. It provides cross-region load balancing, including automatic multi-region failover, which moves traffic to failover backends if your primary backends become unhealthy. Powerful DNS availability. Anycast protects against DNS flood attacks which try to overwhelm DNS resolver servers with excess queries for DNS records. This is why anycast is a load sharing, not a load balancing technique because network devices have a route, or they don't. That means that there could be a lot of open TCP connections if the routes change. As a result, Anycast DNS provides redundancy, load balancing, and high availability. This spreads the queries both across the Anycast network and to the next nearest available server to your visitor. Discover how it can boost your own platforms and services. It does not require any hardware for implementation and thus eliminates any singular failure points. In this work, we introduce a novel methodology to detect the influence of LB on anycast routing, which can be used by operators to detect networks that experience anycast site flipping, where traffic from a single client reaches multiple anycast sites. Overlay Routing with W-ECMP W-ECMP load balances traffic to all possible egress VTEPs based on the weight advertised to reach type-5 EVPN routes originated from outside of the fabric. The topology in this experiment demonstrates anycast based loadbalancing using a set of BGP peered routers, servers, and clients. The technique here is similar to Cloudflare's Load Balancing without Load Balancers. We use our Sep 22, 2022 · However, load balancers and services such as R53 in AWS, can do more intelligent responses by for example looking at source IP and selecting geographically closest server, lowest latency server, load sharing between a set of servers, and so on. Load distribution across regions to the closest Azure region with ultra-low latency. uxdg xjbbf g7a zsrycp lo1 cqp xnhfj 8r3y kip8qqd kz2xvg