US 11,057,343 B2
Default gateway extension
David W. Chang, Milpitas, CA (US); Abhijit Patra, Saratoga, CA (US); Nagaraj Bagepalli, Fremont, CA (US); Dileep Kumar Devireddy, San Jose, CA (US); and Ganesh Sadasivan, Fremont, CA (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Feb. 3, 2020, as Appl. No. 16/780,170.
Application 16/780,170 is a continuation of application No. 14/749,391, filed on Jun. 24, 2015, granted, now 10,554,620.
Claims priority of provisional application 62/168,105, filed on May 29, 2015.
Prior Publication US 2020/0177543 A1, Jun. 4, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 15/16 (2006.01); H04L 29/12 (2006.01); H04L 29/08 (2006.01); G06F 9/4401 (2018.01); H04L 12/46 (2006.01); G06F 9/455 (2018.01); H04L 29/06 (2006.01); H04L 12/911 (2013.01); H04L 12/721 (2013.01)
CPC H04L 61/6022 (2013.01) [G06F 9/4416 (2013.01); G06F 9/45558 (2013.01); H04L 12/4633 (2013.01); H04L 61/103 (2013.01); H04L 63/0272 (2013.01); H04L 67/10 (2013.01); H04L 67/1097 (2013.01); G06F 2009/4557 (2013.01); G06F 2009/45595 (2013.01); H04L 45/66 (2013.01); H04L 47/825 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, via a switch, an address resolution protocol (ARP) request, the switch configured to receive ARP requests to resolve a media access control (MAC) address of a default gateway Internet Protocol (IP) address of a router in a first cloud environment;
detecting whether a malfunction of the router exists;
returning an ARP response including the MAC address of the router in the first cloud environment corresponding to the default gateway IP address unless the malfunction of the router has been detected; and
returning the ARP response including another MAC address of a second router in a second cloud environment that is distinct from the first cloud environment when the malfunction of the router has been detected.