公开(公告)号：US10812446B1

公开(公告)日：2020-10-20

申请号：US16518896

申请日：2019-07-22

Applicant: Cisco Technology, Inc.

Inventor： Satish Kumar Kondalam ,  Sanjay K. Hooda ,  Shyamsundar N. Maniyar

IPC: H04L29/12 ,  H04L12/66 ,  H04L12/46

Abstract: The present disclosure provides for dynamic host configuration across multiple sites in software defined networks, by: receiving, from a host, a DHCP (Dynamic Host Configuration Protocol) discover message at an edge network device of a site; adding to the DHCP discover message a sender border network device IP (Internet Protocol) address for a border network device of the site; transmitting the DHCP discover message, from the border network device to a DHCP server located externally of the site to instruct the DHCP server to return a DHCP offer packet including a destination border network device IP address for a destination border network device of a destination site; receiving the DHCP offer packet; and in response to determining that the destination border network device IP address matches the sender border network device IP address, forwarding the DHCP offer packet to the edge network device to perform DHCP forwarding.

公开(公告)号：US10791004B2

公开(公告)日：2020-09-29

申请号：US16173487

申请日：2018-10-29

Applicant: Cisco Technology, Inc.

Inventor： Prakash Chand Jain ,  Sanjay Kumar Hooda ,  Victor M. Moreno ,  Satish Kumar Kondalam

IPC: G06F15/177 ,  H04L12/46 ,  H04L12/741 ,  H04L12/713 ,  H04L12/715

Abstract: In one example, a router is configured to process communications according to a tunneling protocol to provide network overlay tunnels to facilitate virtual private networks (VPNs) for hosts, and to process communications associated with an external network with use of a provider virtualization routing and forwarding (VRF) instance. With use of a subscription function, the router receives an initial set of extranet VPN prefixes associated with the network overlays for storage in association with the provider VRF, as well as regularly receive publications of updates to extranet VPN prefixes associated with the network overlays. With use of a route obtaining function, the router, in response to receiving a communication associated with one of the stored extranet VPN prefixes at the provider VRF, sends to a communications management server a message indicating request for a host-to-router mapping and receive from the communications management server a reply including the host-to-router mapping.