A system, computer program, computer-readable medium and method for providing a redundant relay, particularly routing function in a network, wherein a superordinate subnetwork is connected to a subordinate subnetwork via redundant relays, particularly routers, a maximum of one of the redundant relays is operated in an active mode at any one time, while the remaining relay(s) are in standby mode, each redundant relay forms a relay redundancy module for controlling the relay mode and a DHCPv6 client for processing a prefix delegation, particularly in accordance with RFC 3633, and the redundant relays each include a relay control module, to which the relay redundancy module of the particular relay signals the current relay mode, and the relay control module of the active relay synchronizes a virtual DUID of its DHCPv6 client and/or a prefix delegated to the active relay to the (or each) relay in standby mode.

The present disclosure provides a region interconnect (RI) controller including a region interconnect routing module configured when a tenant is created. The region interconnect routing module is configured to assign a first identifier to the tenant for identifying traffic of the tenant, in a core switching network, create a virtual routing forwarding instance for the tenant and bind the first identifier and the virtual routing forwarding instance, and to activate a dynamic routing protocol in the core switching network and bind a dynamic routing protocol instance to the virtual routing forwarding instance, where virtual routers corresponding to the tenant and distributed in a plurality of independent network partitions are associated with the region interconnect control method and a computer storage medium. The technical solution of the present disclosure achieves a direct intranet connection in a heterogeneous SDN network region.

Network controllers are described that enable creation of logical interconnects between logical routers of different, isolated virtual networks and for auto-generation and deployment of routing policies to control “leaking” of select routes amongst the different virtual networks. In one example, a network controller includes a memory and processing circuitry configured to identify a source logical router of a first virtual network and a destination logical router of a second virtual network implemented on one or more physical devices of a switch fabric, form a policy defining one or more rules for controlling leaking of one or more of the routes through a logical router interconnect from the source logical router to the destination logical router, and push the policy to the one or more physical devices of the switch fabric for application to communications through the logical router interconnect.

Enabling routing of traffic to/from a roaming host node roaming from a subnet of a home network to a visited network, the host node assigned an IP address in the home network, comprising configuring, in a router of the visited network, a subnet by assigning an IP address range to the subnet, which is in the same IP address range of the subnet of the home network; configuring a tunnel between a router of the home network and the router; configuring a static route to route traffic from a host node destined to the roaming host node; and configuring the router by applying a routing policy enabling the roaming host node to reply to received traffic from said host node received from a first interface and route traffic from the roaming host node through a network interconnecting the router of the visited network and the router of the home network.

A logical routing element (LRE) having multiple designated instances for routing packets from physical hosts (PH) to a logical network is provided. A PH in a network segment with multiple designated instances can choose among the multiple designated instances for sending network traffic to other network nodes in the logical network according to a load balancing algorithm. Each logical interface (LIF) of an LRE is defined to be addressable by multiple identifiers or addresses, and each LIF identifier or address is assigned to a different designated instance.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for implementing a health monitoring system for a cloud application platform. One of the methods includes deploying, by a health monitoring application of a cloud application platform that provisions resources from an underlying cloud infrastructure system, probes for testing components of the cloud application platform. Each probe is configured to perform tests that measure performance of a component of the cloud application platform. A probe can attempt to provision resources from the underlying cloud infrastructure system by launching a test application on the cloud application platform and determine whether the test application launched successfully using resources from the underlying cloud infrastructure system. The health monitoring application receives results of the tests and provides, for display in a graphical user interface, a representation of a history of the results of the tests for at least one of the components.

Example methods and systems for container-based connectivity check in a software-defined networking (SDN) environment are disclosed. One example method may comprise detecting, a request for a connectivity check between a first container-based resource and a second container-based resource; identifying a first logical network element and a second logical network element; and injecting a connectivity check packet at the first logical network element for forwarding towards the second logical network element. The example method also may comprise: obtaining report information associated with one or more intermediate logical network elements located along a path that is traversed by the connectivity check packet; and determining a connectivity status associated with the first container-based resource and the second container-based resource based on the report information.

Systems and methods for supporting inter subnet control plane protocol for consistent multicast membership and connectivity across multiple subnets in a high performance computing environment. In accordance with an embodiment, by associating a multicast group with an inter-subnet partition, and enforcing a dedicated router port for the multicast group, multicast loop avoidance can be provided for between connected subnets. Because only a single router port is selected as being capable of handling the MC packet, no other router port in the subnet can then pass a multicast packet back to the originating subnet.

A system and method for connecting virtual computer networks in a public cloud computing environment using a transit virtual computer network uses a cloud gateway device in the transit virtual computer network that includes a first-tier logical router and a plurality of second-tier logical routers connected to the virtual computer networks. A source Internet Protocol (IP) address of outgoing data packets from a particular virtual computer network is translated at a particular second-tier logical router of the cloud gateway device from an IP address of the particular virtual computer network to an internal IP address from a particular pool of IP addresses. The outgoing data packets are then routed to the first-tier logical router of the cloud gateway device, where the outgoing data packets are transmitted a destination network from a particular interface of the first-tier logical router of the cloud gateway device.

Examples include blocking an interface of a sponsor networking device from receiving data packets and receiving at the sponsor networking device an authentication packet from a first networking device. The first networking device is physically connected to the interface. Examples also include automatically setting by the first networking device, a unique local address for the first networking device; receiving, at the sponsor networking device, a local data packet from the first networking device, and translating, by the sponsor networking device, the local data packet to an off-fabric data packet.