![]() ![]() 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 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 does not use BGP for VXLAN overlays. This allows Calico 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’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. There are many ways to configure a BGP network depending on your environment. You can configure Calico nodes to peer with each other, with route reflectors, or with top-of-rack (ToR) routers. You can think of Calico 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 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 nodes can exchange routing information over BGP to enable reachability for Calico networked workloads (Kubernetes pods or OpenStack VMs). When IPv6 BGP is used, configure a routing policy to make sure the next hop of a route destined for a remote private network is the IP address of the peer spoke in a full-mesh network (EBGP does not support full-mesh), or is the IP address of the hub in a hub-spoke network.įor more information about routing protocols and policies, see Layer 3- IP Routing Configuration Guide.Configure BGP (Border Gateway Protocol) between Calico nodes or peering with network infrastructure to distribute routing information. ![]() When RIPng is used, only the full-mesh network is supported. When OSPFv3 is used, set the network type of an OSPFv3 interface to broadcast in a full-mesh network or to P2MP in a hub-spoke network. When BGP is used, configure a routing policy to make sure the next hop of a route destined for a remote private network is the IP address of the peer spoke in a full-mesh network (EBGP does not support full-mesh), or is the IP address of the hub in a hub-spoke network.ĪDVPN supports OSPFv3, RIPng, and IPv6 BGP for IPv6: RIP is not supported in a full-mesh network. You can use RIP only in a hub-spoke network and you must also disable split horizon. When OSPF is used, set the network type of an OSPF interface to broadcast in a full-mesh network or to P2MP in a hub-spoke network. ADVPN supports OSPF, RIP, and BGP for IPv4: ![]()
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