--- title: "What’s new in Calico v3.3" source: "https://wordpress-1075849-4005834.cloudwaysapps.com/blog/whats-new-in-calico-v3-3/" --- [Technical Blog](https://wordpress-1075849-4005834.cloudwaysapps.com/category/technical-blog/) # What’s new in Calico v3.3 By [Casey Davenport](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/author/caseydavenport/) on Oct 24, 2018 • 2 min read We are very excited to announce Calico v3.3. Here are some highlights from the release. ## In-cluster route reflector With Calico v3.3, you can enable the calico/node container [to behave as a route reflector](http://docs.projectcalico.org/v3.3/usage/configuration/bgp#configuring-in-cluster-route-reflectors) on particular nodes in the cluster. calico/node in route reflector mode now fully supports route reflector clustering, route reflector peering with external routers, and the full set of BGP configuration options supported by Calico. This functionality replaces the calico/routereflector container, which is now deprecated. ## BGP peer configuration using labels In Calico v3.3, you can now use node labels and selectors to define BGP peering relationships between calico/node instances. This allows for easier management of BGP peer configuration in a way that scales automatically with your cluster. Combined with the in-cluster route reflector feature, this provides a powerful model for defining how routes are distributed within the cluster. ## IPAM enhancements When using Calico IPAM, you can now configure the block size allocated to each host for each IP Pool. The default block size of /26 for IPv4 provides blocks of 64 addresses. For details refer to the [Project Calico IP Pool documentation](http://docs.projectcalico.org/v3.3/reference/calicoctl/resources/ippool). Additionally, cluster administrators can now define specific IP pools to be used for particular Kubernetes namespaces using namespace annotations. ## Support SCTP in Network Policy Kubernetes 1.12 includes alpha Stream Control Transmission Protocol (SCTP) support. Calico v3.3 has been updated to support SCTP if included in your network policy spec. ## Learn more To find out more details about all the features and changes in Calico v3.3, check out the [release notes](http://docs.projectcalico.org/v3.3/releases/). Or, try it out in few minutes by following the [Quickstart guide](http://docs.projectcalico.org/v3.3/getting-started/kubernetes/)!   [Open Source](https://wordpress-1075849-4005834.cloudwaysapps.com/tags/open-source/)[Release](https://wordpress-1075849-4005834.cloudwaysapps.com/tags/release/)[Project Calico](https://wordpress-1075849-4005834.cloudwaysapps.com/tags/project-calico/) Add Tigera as a preferred source on Google to see more of our content in your search results. [![Add as a preferred source on Google](https://wordpress-1075849-4005834.cloudwaysapps.com/app/themes/tigera2021/dist/img/google-preferred-source-light.png)](https://www.google.com/preferences/source?q=tigera.io) ## Related posts [![What’s New in Calico: Winter 2026 Release](https://wordpress-1075849-4005834.cloudwaysapps.com/app/uploads/2026/03/What-is-new-in-Calico-winter-2026.png)](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/whats-new-in-calico-winter-2026-release/) [Company Blog](https://wordpress-1075849-4005834.cloudwaysapps.com/category/company-blog/) #### [What’s New in Calico: Winter 2026 Release](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/whats-new-in-calico-winter-2026-release/) By [Veronika Smolik](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/author/veronika-smolik/) on Mar 4, 2026 AI Powered Intelligence, Unified Traffic Observability and Scalable Infrastructure Management As anyone managing one or more Kubernetes clusters knows by now, scaling can introduce an exponentially growing number of problems. The sheer volume of metrics,... [Read more](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/whats-new-in-calico-winter-2026-release/) [![Join Calico at KubeCon Europe 2026: AI Agents, Silent Discos, and Dutch Delights!](https://wordpress-1075849-4005834.cloudwaysapps.com/app/uploads/2026/02/Blog-Kubecon-Euro-2026-.png)](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/calico-at-kubecon-cloudnativecon-europe2026/) #### [Join Calico at KubeCon Europe 2026: AI Agents, Silent Discos, and Dutch Delights!](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/calico-at-kubecon-cloudnativecon-europe2026/) By [Tigera Team](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/author/marketingtigera-io/) on Feb 25, 2026 The cloud-native community is heading to the historic canals and vibrant tech scene of Amsterdam for KubeCon + CloudNativeCon Europe 2026! From March 23–26, Amsterdam will be buzzing with the latest in Kubernetes, platform engineering,... [Read more](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/calico-at-kubecon-cloudnativecon-europe2026/) [![Project Calico 3.30+ Hackathon: Show Us What You Can Build!](https://wordpress-1075849-4005834.cloudwaysapps.com/app/uploads/2026/02/Blog-Hackathon-.png)](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/project-calico-3-30-hackathon-show-us-what-you-can-build/) #### [Project Calico 3.30+ Hackathon: Show Us What You Can Build!](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/project-calico-3-30-hackathon-show-us-what-you-can-build/) By [Tigera Team](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/author/marketingtigera-io/) on Feb 17, 2026 Build the Future of Cloud-Native Networking! 🚀 The Calico community moves fast. With the releases of Calico 3.30 and 3.31, brings improvements in scalability, network security, and visibility. Now, we want to see what YOU... [Read more](https://wordpress-1075849-4005834.cloudwaysapps.com/blog/project-calico-3-30-hackathon-show-us-what-you-can-build/)