In some examples, a method includes selecting, by a first virtual routing node of a single-chassis network device having a plurality of forwarding components and a plurality of fabric links coupling respective pairs of the plurality of forwarding components at respective fabric interfaces of the plurality of forwarding components, a fabric interface of a forwarding component of the plurality of forwarding components that has an egress interface toward a network destination and that is associated with the first virtual routing node; in response to receiving a message specifying the fabric interface, storing, by the second virtual routing node to a context forwarding table of the second virtual node, the fabric interface as a next hop for the network destination; selecting, by the second virtual routing node and based on the context forwarding table and a context next hop in a first forwarding table pointing to the context forwarding table, the fabric interface for forwarding network packets destined for the network destination.

Fabric path context-based forwarding for virtual nodes

Techniques for repair and/or recovery of computer program(s) installed on a programmable device using a distributed ledger that is based on cryptography and blockchain technology are described. One or more self-reliance logic/modules can commit, to a distributed ledger that resides on interconnected devices, records of watchdog communications between the devices. One or more of interconnected devices may include a respective self-reliance logic/module. The logic/modules can use the records of the distributed ledger to check that computer program(s) on the interconnected devices are operating as expected. When a self-reliance logic/module fails to respond to a watchdog communication, the distributed ledger can be updated to include this failure. A self-reliance logic/module can determine, based on the distributed ledger and/or the failure, that an installed computer program is faulty. Furthermore, a self-reliance logic/module can initiate one or more software recovery services based on the determination. Other advantages and embodiments are described.

Failover response using a known good state from a distributed ledger

The invention relates to connecting virtual nodes in a network device using abstract fabric interfaces. In one example, a management component executing on a single-chassis network device configures avirtual node with an abstract fabric interface having, as a destination address, identifiers of packet processors (e.g., PFE-IDs) assigned to the virtual node on the other end of the abstract fabricinterface. The management component of the single-chassis network device pre-creates an underlay network by using the fabric links at the packet processor. When the management component creates and connects an abstract fabric interface on the virtual nodes, the management component forms an overlay network and attaches the overlay network to the underlay network, e.g., by programming the forwarding plane packet processor, to connect the virtual nodes. However, users of the network device, external devices, and routing protocols will not view the abstract fabric interface as an overlay interface, but as a regular Ethernet interface (e.g., a Gigabit Ethernet interface).

Connecting virtual nodes in a network device using abstract fabric interfaces

The invention discloses a monitoring method, a device, a device and a medium of a virtual machine. The method comprises the steps of: deploying a Libvirt tool in a physical server; In which a virtualmachine cluster is running in the physical server; the virtual machine manager address corresponding to the virtual machine cluster is set in the virConnect interface provided by the Libvirt tool to establish the communication relationship between the Libvirt tool and the virtual machine cluster. The target virtual machine in the virtual machine cluster is selected, and the characteristic information of the target virtual machine is used as a parameter to call the resource monitoring interface provided by Libvirt tool to obtain the running state information of the target virtual machine. The method does not need to arrange a monitoring agent or plug-in on the monitored virtual machine, so the load of the virtual machine is relatively lightened, and the service quality of the virtual machine is ensured. In addition, the invention also provides a monitoring device, a device and a medium of a virtual machine, and the beneficial effects are as described above.

Monitoring method, device, apparatus and medium for virtual machine

Techniques are disclosed for hot swapping one or more module devices on a single host device. A module device can perform module-specific tasks that are defined in its module software driver. Using one or more application programming interfaces, the host device communicates with the module device's module software driver to allow the module device to perform module-specific tasks while removably connected to the host device.

Unmanned ground and aerial vehicle attachment system

Systems, methods, apparatus, and a computer-readable medium are described for generating and receiving information regarding the current state of the active virtual machine in the host and switching the standby virtual machine from standby to active in response to determining that the current active virtual machine may no longer be able to service network packets.

High availability for virtual machines

Provided are systems, methods, and computer-readable medium for enabling sharing of a multi-channel packet processor by multiple processes executing on a network device. The network device can include a memory management unit, configured to include an address map. The address map can include a reserved portion. The virtual machine can allocate a guest portion in the address map, where the guest portion is allocated in a part of the address map that does not include the reserved portion. A first channel from the packet processor can be assigned to the guest portion, and the virtual machine can use the first channel to receive packets. The reserved portion can be assigned to a host process executing on the network device. A second channel from the packet processor can be assigned to the reserved portion. The host process can transmit packets to the network using the second channel.

Multichannel input/output virtualization

A network device may include various cards and modules, such as management modules, line cards, and switch fabric modules. In various implementations, these components can be “hot-plugged” meaning that the components can be inserted into and removed from the network device while the network device is powered on. In various implementations, hardware in the network device can identify when a component has been added. The hardware can notify a virtual machine, which can then notify the host operating system. The host operating system can added the component, and then notify the virtual machine to also add the component. Once the virtual machine has added the component, the component becomes available for use by processes executing on the virtual machine.

Hot-plug hardware and software implementation

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High availability for virtual machines

Multichannel input/output virtualization

Hot-plug hardware and software implementation