![]() ![]() Significantly changing Calico Enterprise's BGP topology, such as changing from full-mesh to peering with ToRs, may result in temporary loss of pod network connectivity during the reconfiguration process. calicoctl must be installed and configured. ![]() However, this is typically needed only if the number of nodes in each L2 domain is large (> 100).įor a deeper look at common on-premises deployment models, see Calico over IP Fabrics. How you configure your BGP is up to you - Calico Enterprise works well with both iBGP and eBGP configurations, and you can effectively treat Calico Enterprise like any other router in your network design.ĭepending on your topology, you may also consider using BGP route reflectors within each rack. There are many ways to build an on-premises BGP network. Typically, this involves disabling Calico Enterprise’s default full-mesh behavior, and instead peer Calico Enterprise with your 元 ToR routers. In on-premises deployments, you can configure Calico Enterprise to peer directly with your physical network infrastructure. Other nodes are then configured to peer with a subset of those route reflectors (typically 2 for redundancy), reducing the total number BGP peering connections compared to full-mesh. In this model, some nodes act as route reflectors and are configured to establish a full mesh amongst themselves. To build large clusters of internal BGP (iBGP), BGP route reflectors can be used to reduce the number of BGP peerings used on each node. So if you want to run Calico as an overlay network in Azure, you must configure Calico Enterprise to use VXLAN.įull-mesh works great for small and medium-size deployments of say 100 nodes or less, but at significantly larger scales full-mesh becomes less efficient, and we recommend using route reflectors. The notable exception is Azure, which blocks IPIP traffic. Calico Enterprise does not use BGP for VXLAN overlays. This allows Calico Enterprise to operate over any L2 network, whether public cloud or private cloud, or, if IPIP is configured, to operate as an overlay over any network that does not block IPIP traffic. When BGP is enabled, Calico Enterprise’s default behavior is to create a full-mesh of internal BGP (iBGP) connections where each node peers with each other. Here are some common ways it is done with Calico Enterprise. There are many ways to configure a BGP network depending on your environment. You can configure Calico Enterprise nodes to peer with each other, with route reflectors, or with top-of-rack (ToR) routers. ![]() You can think of Calico Enterprise networking as providing a virtual router on each of your nodes. Each router running BGP has one or more BGP peers - other routers which they are communicating with over BGP. This how-to guide uses the following Calico Enterprise features:īGP is a standard protocol for exchanging routing information between routers in a network. In public cloud deployments, it provides an efficient way of distributing routing information within your cluster, and is often used in conjunction with IPIP overlay or cross-subnet modes. In an on-premises deployment this allows you to make your workloads first-class citizens across the rest of your network. Value Ĭalico Enterprise nodes can exchange routing information over BGP to enable reachability for Calico Enterprise networked workloads (Kubernetes pods or OpenStack VMs). Configure BGP (Border Gateway Protocol) between Calico nodes or peering with network infrastructure to distribute routing information.
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