Calico is a networking and network security solution for containers, virtual machines, and native host-based workloads. It is widely used in Kubernetes environments to provide scalable networking and security policies. One of its key features is the ability to integrate with BGP (Border Gateway Protocol) to distribute routing information.
When using Calico, you might encounter an issue where the BGP session is not established. This is typically observed when network routes are not being propagated as expected, leading to connectivity issues between nodes or pods in your Kubernetes cluster.
You may see error logs indicating that the BGP session is down or that there are issues with route advertisement. These logs can usually be found in the Calico node logs or the BGP daemon logs.
The error code CALICO-1002 signifies that the BGP session is not established. This can occur due to several reasons, such as incorrect BGP peer configuration, network issues, or firewall rules blocking BGP traffic.
BGP is used by Calico to exchange routing information between nodes. Each node in the cluster acts as a BGP speaker, and they establish sessions with each other to share routing information. For more details on how BGP works in Calico, you can refer to the Calico BGP documentation.
To resolve the BGP session establishment issue, follow these steps:
calicoctl get bgppeers -o yaml to review the current BGP peer configuration.ping or traceroute to test connectivity.kubectl logs to access the logs.kubectl rollout restart daemonset calico-node -n kube-system to restart the Calico node daemonset.For more information on troubleshooting BGP issues in Calico, refer to the Calico BGP troubleshooting guide. This guide provides detailed steps and additional commands to diagnose and resolve BGP-related issues.
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