In one or more embodiments, one or more systems of a physical optical network that may implement and/or manage a virtual optical network (VON) that interconnects multiple data centers. Virtual nodes based the multiple data centers to be interconnected may be determined, and each of the virtual nodes may be mapped to at least two physical nodes of the physical optical network. Virtual links for pairs of the virtual nodes may be determined, and each virtual link may be mapped to at least one optical network connection of the physical optical network. At least one of a physical node impairment and an optical network connection impairment that is associated with a first physical node implementing a first virtual node may be detected, and the first virtual node may be implemented via a second physical node.

Example implementations relate to configuring network devices. For example, a network device includes a controller module to receive a link layer discovery protocol (LLDP) message from a second network device in response to determining that connection to a management device has failed. The controller module is to send a second LLDP message to the second device, where information contained is the second LLDP message is routed to the management device by the second device. The controller module is further to receive configuration changes from the management device and connect to the management device based on the configuration changes, where the configuration changes are routed by the second device.

A data network analysis system includes a computer-executable set of instructions that obtain service account information associated with a route provided to a customer through a data communication network having network elements. Using the service account information, the instructions identify a termination port that terminates the route to a customer premises equipment of the customer, and at least one target port of the route and those network elements that are assigned to convey the route through one or more of the network elements. The instructions then obtain the routing information for the route from each of the network elements that are assigned to convey the route.

MPLS segment routing is disclosed. In one embodiment, a first core router generates a first data structure that maps first portcodes to respective identities of first neighbor routers or respective first links, wherein the first portcodes identify respective first ports of the first core router, and wherein the first ports are coupled to the first neighbor routers, respectively, via the first links, respectively. The first core router generates and transmits a first link-state packet, wherein the first link-state packet comprises an identity of the first core router and the first data structure.

Disclosed herein is a mechanism for discovering SDN specific topology information in a SDN interconnection network. SDN specific topology information may comprise SDN IDs, SDN member router ID lists, and SDN address lists. A SDNC associated with a local SDN domain in the SDN interconnection network may determine a set of routers and/or links in the local SDN domain for link advertisement and may associate the set of routers with the local SDN domain. The SDNC may further determine a set of border routers in the local SDN domain for broadcasting the link advertisements and SDN specific topology information to other interconnected SDN domains. The SDNC may receive link advertisement and SDN specific topology information from other interconnected SDN domains and may compute a best path through each router and/or link across the SDN domains.

A parent PCE controller comprising a memory comprising instructions executable by a processor and a processor coupled to the memory and configured to execute the instructions. Executing the instructions causes the processor to establish a parent-child relationship with at least a first child PCE controller controlling a first domain and a second child PCE controller controlling a second domain, receive a request to create an E2E tunnel from a source to a destination crossing the first domain and the second domain, compute a shortest path from the source to the destination through the first domain and the second domain, transmit a request message to the first child PCE controller for creating a first tunnel segment of the E2E tunnel through the first domain, and transmit a request message to the second child PCE controller for creating a second tunnel segment of the E2E tunnel through the second domain.

A method includes receiving, by a network device, notification packets separately sent by a plurality of forwarding nodes, where each notification packet includes interface forwarding delay information of the forwarding node that sends the notification packet, device forwarding delay information of the forwarding node, and a transmission delay of a link connected to the forwarding node; obtaining the interface forwarding delay information and the device forwarding delay information of each of the plurality of forwarding nodes, and obtaining a transmission delay of a link between the plurality of forwarding nodes; and computing a forwarding path between a first forwarding node and a second forwarding node, where a forwarding delay of the forwarding path meets a delay requirement of a service.

In an example, a computer-readable medium may store executable instructions. The executable instructions may be to detect an inoperative network device in a communication network managed by a controller, determine a network switching function assigned to the inoperative network device, and provide the network switching function through the controller itself instead of the inoperative network device.

Embodiments of the present disclosure relate to methods and systems for on-demand next-hop resolution. Aspects of the embodiments include receiving a triggering event to prompt a request for a path to a network location; requesting a path computation from a second network element based on receiving the triggering event; receiving the path computation from the second network element; and programming an output interface with an indication of the path computation received from the second network element.

In general, techniques are described for managing routing information in a hub-and-spoke network in a manner that reduces flooding of link information. A hub router of the hub-and-spoke network including a memory and a processor may perform the techniques. The memory may be configured to store a representation of a topology of the hub-and-spoke network. The processor may be configured to utilize a separate instance of a multi-instance version of a link state protocol to communicate with each of a plurality of spoke routers of the hub-and-spoke network. Each separate instance of the multi-instance version of the link state protocol may include the hub router and a different one of the plurality of spoke routers. The processor may process link state advertisements from the separate instances of the multi-instance version of the link state protocol to maintain the representation of the topology of the hub-and-spoke network.