--- title: "What’s new in Calico v3.3" source: "https://www.tigera.io/blog/whats-new-in-calico-v3-3/" --- [Technical Blog](https://www.tigera.io/category/technical-blog/) # What’s new in Calico v3.3 By [Casey Davenport](https://www.tigera.io/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://www.tigera.io/tags/open-source/)[Release](https://www.tigera.io/tags/release/)[Project Calico](https://www.tigera.io/tags/project-calico/) ## Related posts [![What’s new in Calico: Spring 2026 Release](https://www.tigera.io/app/uploads/2026/06/Whats-New-in-Calico-NEW-TEMPLATE-2026.png)](https://www.tigera.io/blog/whats-new-in-calico-spring-2026-release/) [Company Blog](https://www.tigera.io/category/company-blog/) #### [What’s new in Calico: Spring 2026 Release](https://www.tigera.io/blog/whats-new-in-calico-spring-2026-release/) By [Veronika Smolik](https://www.tigera.io/blog/author/veronika-smolik/) on Jun 2, 2026 Kubernetes has come a long way since its debut in 2014. It’s gone from running a couple of containerized microservices to orchestrating fleets of production workloads spanning everything from AI agents to full scale VMs... [Read more](https://www.tigera.io/blog/whats-new-in-calico-spring-2026-release/) [![Kubernetes Operational Maturity: Secure and Resilient Cluster Federation with Cluster Mesh](https://www.tigera.io/app/uploads/2026/05/Kubernetes-Operational-Maturity-Secure-and-Resilient-Cluster-Federation-with-Cluster-Mesh.png)](https://www.tigera.io/blog/kubernetes-operational-maturity-secure-and-resilient-cluster-federation-with-cluster-mesh/) #### [Kubernetes Operational Maturity: Secure and Resilient Cluster Federation with Cluster Mesh](https://www.tigera.io/blog/kubernetes-operational-maturity-secure-and-resilient-cluster-federation-with-cluster-mesh/) By [Veronika Smolik](https://www.tigera.io/blog/author/veronika-smolik/) on May 25, 2026 Practically no one runs a single Kubernetes cluster in production these days. Maybe that’s how it started but data sovereignty requirements, acquisitions, AI initiatives and the need for edge servers, among other considerations, have pulled... [Read more](https://www.tigera.io/blog/kubernetes-operational-maturity-secure-and-resilient-cluster-federation-with-cluster-mesh/) [![What’s New in Calico v3.32](https://www.tigera.io/app/uploads/2026/05/Green-Please-use-a-different-background-color-alternately-1.png)](https://www.tigera.io/blog/whats-new-in-calico-v3-32/) #### [What’s New in Calico v3.32](https://www.tigera.io/blog/whats-new-in-calico-v3-32/) By [Reza Ramezanpour](https://www.tigera.io/blog/author/rezar/) on May 13, 2026 We’re excited to announce the release of Calico Open Source v3.32! 🎉 This release corresponds with Kubernetes v1.36 (Codename Haru) and it goes beyond just sharing a cat as the mascot of the release, it... [Read more](https://www.tigera.io/blog/whats-new-in-calico-v3-32/)