Cisco Technology, Inc.

Gaurav Badoni

Dhananjaya Rao

Hasmit S Grover

Senthil Kenchiah

Victor Manuel Moreno

Vrushali Ashtaputre

Dino Farinacci

Sreenivas Duvvuri

Nataraj Bacthu

Suresh Pasupula

Priyanka Warade

In one embodiment, an authoritative edge device (AED)-server in a computer network maintains assignment of an active AED for a particular virtual local area network (VLAN), and in response to a triggered re-assignment, sends an AED change request identifying an old active AED for the particular VLAN and a new active AED for the particular VLAN (e.g., and/or corresponding backups). In response to receiving the change request, the old active AED ceases forwarding of traffic for the particular VLAN and transmits a relinquishment confirmation into the network. Also, in response to receiving the change request and the relinquishment confirmation from the old active AED, the new active AED assumes responsibility for traffic forwarding for the particular VLAN and transmits an activation confirmation into the network. The change request is then deemed completed by the AED-sever upon receipt of both the relinquishment confirmation and the activation confirmation.

Centralized management of authoritative edge devices

Methods, devices, and computer-readable medium for preventing broadcast looping during a site merge are described herein. An example method can include detecting a site merge between a plurality of layer 2 (L2) networks using a spanning tree protocol (STP), blocking a data traffic port connecting the L2 networks in response to detecting the site merge, and performing an STP-Ethernet virtual private network (EVPN) handshake. The STP-EVPN handshake can include changing a root bridge in one of the L2 networks. Thereafter, the method can include unblocking the data traffic port connecting the L2 networks. In other words, the data traffic port connecting the L2 networks can be unblocked after changing the root bridge in the one of the L2 networks.

Methods, devices, and computer-readable media for preventing broadcast loops during a site merge

Devices, methods and instructions encoded on computer readable medium for implementation of a dual-adjacency between edge devices of a network site. A first edge device comprises one or more local interfaces configured for communication, via a local network, with one or more network devices co-located in a first network site. The first edge device also comprises one or more overlay interfaces configured for communication, via a core network, with one or more network devices located in one or more other network sites connected to the core network. The first edge device comprises a processor configured to establish, via at least one of the local interfaces, a site communication channel with a second edge device co-located in the first network site. The processor is further configured to establish an overlay communication channel, via at least one of the overlay interfaces, with the second edge device.

Dual adjacency between edge devices at a network site

A first provider edge network device that is configured in a multi-homed virtual private network for a data center in which there are one or more peer edge network devices including a second edge network device, receives from the second edge network device a message indicating that a link for a particular Ethernet segment of the second edge network device in the data center is down. Information is stored at the first edge network device indicating state of links for Ethernet segments associated with each of the one or more other edge network devices at the data center. The first edge network device forwards of traffic for the particular Ethernet segment locally on Ethernet segments in the data center on behalf of the second edge network device. The proxy forwarding is performed for traffic for the particular Ethernet segment that originates from the data center, that is, for 'same-site' traffic.

Proxy forwarding of local traffic by edge devices in a multi-homed overlay virtual private network

Techniques are provided for designating, in an overlay transport virtualization (OTV) network connected to a data center, an edge device to act as a backup authoritative edge device (BAED) for an authoritative edge device (AED) for multicast packet encapsulation and forwarding. Data traffic associated with a given virtual local area network (VLAN) may be detected from a multicast source in the data center addressed to recipients in a site group. A mapping may be generated between the site group and a core data group in the OTV network for traffic from the multicast source. Advertisements may be sent of the mapping to edge devices in another data center across the OTV network. A similar configuration is presented for a BAED for inbound multicast traffic to a data center.

Proactive creation of multicast state in an overlay transport network to achieve fast convergence on failover

Techniques are presented herein for optimizing traffic routing in overlay networks. At a first edge device located at a first site in a network, a message is received that indicates address information of a network device. The address information of the network device is stored in an address table. The address information is associated with a site identifier that identifies a second site at which the network device is located. The site identifier is mapped to an identifier associated with a second edge device that is responsible for routing traffic to network devices at the second site.

Distributed fast remote cutover of traffic upon local failure in an overlay transport visualization network

Devices, methods and instructions encoded on computer readable medium are provided herein for creation of an overlay network on a non-multicast or source specific multicast (SSM) core. In one example, virtual private network (VPN) adjacencies are established between an adjacency server and one or more edge devices each located at different network sites. A unicast replication list is then generated at the adjacency server. The unicast replication list includes the Internet Protocol addresses for each of the edge devices having VPN adjacencies with the adjacency server. The unicast replication list is then advertised to each of the edge devices for use in establishing VPN adjacencies with one another.

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San Jose, CA, United States of America

Gaurav Badoni