I have a kubernetes cluster of some virtual machines running on top of Vsphere. I deployed Calico IP-IP plugin for connectivity and every thing is Ok. My questions are : 1) As calico performs BGP routed between the nodes , Does that also happen in the IPIP case or the flow is only Full mesh IPIP tunnels. 2) If there is BGP routes --- how can i check them ? and how were they advertised through the hypervisor ?
3) If not... how does the packet flow go between pods in my case ?
I tried to check the calicoctl results but no peers. Some of Ip route results : 192.168.0.0/24 via 172.16.5.226 dev tunl0 proto bird onlink 192.168.2.0/24 via 172.16.5.228 dev tunl0 proto bird onlink
1) If by IPIP you mean node-to-node peering, then yes, it's configurable
calicoctl config set nodeToNodeMesh offFor large-scale deployments, or for deployments where you require a more specific BGP topology (e.g., peering with ToR switches) the full node-to-node mesh should be disabled and explicit BGP peers configured for your Calico nodes. A BGP peer may be configured in your Calico network as a global BGP peer or a per-node BGP peer
2) List a routing table route -n The direct routes are set up by a Calico agent named Felix when it is asked to provision connectivity for a particular workload. A BGP client (such as BIRD) then notices those and distributes them – perhaps via a route reflector – to BGP clients running on other hosts