# US 10,122,619 B2 · Resilient dual-homed data network hand-off > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,619 B2 - Document ID: US10122619B2 - Status: Granted - Kind: B2 - Application number: 15/687,822 - Filed: 2017-08-28 - Published: 2017-12-14 - Granted: 2018-11-06 - Earliest claimed: 2013-12-13 - Assignees: Ciena Corporation - Applicants: Ciena Corporation - Inventors: Marc Holness; Wei-Chiuan Chen; Asheesh Jadav - Web page: https://patentgrep.com/patent/US10122619B2 ## CPC - H04L 45/22: {Alternate routing} - H04L 41/0659: by isolating or reconfiguring faulty entities - H04L 45/28: using route fault recovery - H04L 41/0806: for initial configuration or provisioning, e.g. plug-and-play - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Systems and methods for L2 Ethernet resilient hand-off include an access network configured between a first end point and a second end point, a first communication path and a second communication path for data flow between the first end point and the second end point, wherein the first communication path is active and the second communication path is inactive, and if a fault is detected in the first communication path, logic configured to activate the second communication path and perform a resilient hand-off of the data flow from the first communication path to the second communication path. ## Claims ### Claim 1 A device in an access network configured to perform a resilient dual-homed hand-off, the device comprising: a first port connected to a subtending router in a separate network domain from the access network, wherein the separate network domain utilizes a first protocol; and a second port connected to the access network and configured to transmit and receive status messages in a second protocol associated with the access network which is different from the first protocol, wherein the status messages convey one or more of activity/inactivity and status of the first port over the second port to a second device configured for the resilient dual-homed hand-off independent of particular technologies in the access network and the separate network domain utilizing programming between the first protocol and the second protocol to convey the one or more of activity/inactivity and status of the first port in the first protocol over the second protocol. ### Claim 2 (depends on 1) The device of claim 1, wherein the second port is configured as a Maintenance End Point (MEP) in the access network and configured to transmit and receive Continuity Check Messages (CCMs) for the status messages. ### Claim 3 (depends on 1) The device of claim 1, wherein the device is further configured to receive signaling from the subtending router related to the one or more of activity/inactivity and status. ### Claim 4 (depends on 1) The device of claim 1, wherein the first port uses one of a Link Aggregation Group (LAG), Multi-Protocol Label Switching (MPLS), and MPLS-Transport Profile (MPLS-TP), Pseudowire (PW), and the access network utilizes Ethernet. ### Claim 5 (depends on 1) The device of claim 1, wherein the status messages comprise Type Length Value (TLVs) which are programmed in the device, the subtending router, and a second device in the access network providing the resilient dual-homed hand-off. ### Claim 6 (depends on 1) The device of claim 1, wherein the status messages are over an Ethernet Virtual Circuit connected between the device and the second device in the access network. ### Claim 7 A method of performing resilient dual-homed hand-off implemented by a device in an access network, the method comprising: communicating over a first port with a subtending router in a separate network domain from the access network, wherein the separate network domain utilizes a first protocol; transmitting and receiving status messages in a second protocol associated with the access network, which is different from the first protocol, over a second port connected to the access network; and conveying one or more of activity/inactivity and status of the port to a second device configured for the resilient dual-homed hand-off, wherein the status messages are independent of particular technologies in the access network and the separate network domain and utilize programming between the first protocol and the second protocol to convey the one or more of activity/inactivity and status of the first port in the first protocol over the second protocol. ### Claim 8 (depends on 7) The method of claim 7, wherein the second port is configured as a Maintenance End Point (MEP) in the access network and configured to transmit and receive Continuity Check Messages (CCMs) for the status messages. ### Claim 9 (depends on 7) The method of claim 7, further comprising receiving signaling from the subtending router related to the one or more of activity/inactivity and status. ### Claim 10 (depends on 7) The method of claim 7, wherein the first port uses one of a Link Aggregation Group (LAG), Multi-Protocol Label Switching (MPLS), and MPLS-Transport Profile (MPLS-TP), Pseudowire (PW), and the access network utilizes Ethernet. ### Claim 11 (depends on 7) The method of claim 7, wherein the status messages comprise Type Length Value (TLVs) which are programmed in the device, the subtending router, and a second device in the access network providing the resilient dual-homed hand-off. ### Claim 12 (depends on 7) The method of claim 7, wherein the status messages are over an Ethernet Virtual Circuit connected between the device and the second device in the access network. ### Claim 13 An access network configured for resilient dual-homed hand-off, the access network comprising: a first device connected to a first subtending router in a first separate domain from the access network, wherein the separate network domain utilizes a first protocol and the access network utilizes a second protocol different from the first protocol; and a second device connected to a second subtending router in a second separate domain from the access network, wherein status messages between the first device and the second device over the access network convey one or more of activity/inactivity and status of the first subtending router and the second subtending router for the resilient dual-homed hand-off independent of particular technologies in the access network, the first separate network domain, and the second separate domain utilizing programming between the first protocol and the second protocol to convey the one or more of activity/inactivity and status of the first subtending router in the first protocol over the second protocol. ### Claim 14 (depends on 13) The access network of claim 13, wherein the first device and the second device are each configured as a Maintenance End Point (MEP) in the access network and configured to transmit and receive Continuity Check Messages (CCMs) for the status messages. ### Claim 15 (depends on 13) The access network of claim 13, wherein the first device and the second device are each further configured to receive signaling from the first subtending router and the second subtending router, respectively, related to the one or more of activity/inactivity and status. ### Claim 16 (depends on 13) The access network of claim 13, wherein the first subtending router and the second subtending router use one of a Link Aggregation Group (LAG), Multi-Protocol Label Switching (MPLS), and MPLS-Transport Profile (MPLS-TP), Pseudowire (PW), and the access network utilizes Ethernet. ### Claim 17 (depends on 13) The access network of claim 13, wherein the status messages comprise Type Length Value (TLVs) which are programmed in the first device, the second device, the first subtending router, and the second subtending router for providing the resilient dual-homed hand-off.