# US 11,444,807 B2 · EVPN VPWS FXC local switching connectivity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,807 B2 - Document ID: US11444807B2 - Status: Granted - Kind: B2 - Application number: 16/749,008 - Filed: 2020-01-22 - Published: 2021-07-22 - Granted: 2022-09-13 - Earliest claimed: 2020-01-22 - Assignees: Ciena Corporation - Applicants: Ciena Corporation - Inventors: Marc Holness - Web page: https://patentgrep.com/patent/US11444807B2 ## CPC - H04L 12/4641: {Virtual LANs, VLANs, e.g. virtual private networks [VPN] (LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272)} - H04L 45/245: {Link aggregation, e.g. trunking} - H04L 45/28: using route fault recovery - H04L 45/50: using label swapping, e.g. multi-protocol label switch [MPLS] - H04L 45/66: {Layer 2 routing, e.g. in Ethernet based MAN's} - Y02D 30/00: Reducing energy consumption in communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A network element configured to implement an Ethernet Virtual Private Network (EVPN) Virtual Private Wire Service (VPWS) Flexible Cross-Connect (FXC) local switching service includes a plurality of ports; and a switching fabric configured to switch traffic between the plurality of ports; wherein a set of ports is configured in a distributed Link Aggregation Group (LAG) with two nodes, and an inter-chassis link configured with a second network element, and wherein, responsive to a failure of the inter-chassis link, a distribution state of members in the distributed LAG is coordinated. ## Claims ### Claim 1 A network element configured to implement an Ethernet Virtual Private Network (EVPN) Virtual Private Wire Service (VPWS) local switching service, the network element comprising: a plurality of ports; and a switching fabric configured to switch traffic between the plurality of ports; wherein a set of ports is configured in a distributed Link Aggregation Group (LAG) with at least two nodes, and an inter-chassis link is configured with a second network element, and wherein, responsive to a failure of the inter-chassis link, a distribution state of members in the distributed LAG is coordinated utilizing a common VPWS that includes a plurality of members with different Ethernet Segment Instances (ESI) such that all of the plurality of members are configured with a same distribution state. ### Claim 2 (depends on 1) The network element of claim 1, wherein the distribution state is coordinated based on detection of a member being out-of-distribution. ### Claim 3 (depends on 1) The network element of claim 1, wherein the distribution state is coordinated by taking all the plurality of members of the common VPWS out-of-distribution when any of the plurality of members is out-of-distribution. ### Claim 4 (depends on 3) The network element of claim 3, wherein the common VPWS is based on a normalized Virtual Local Area Network (VLAN) Identifier (VID). ### Claim 5 (depends on 1) The network element of claim 1, wherein the failure of the inter-chassis link is subsequent to a fault affecting a port in the set of ports, where recovery occurs based on the distributed LAG. ### Claim 6 (depends on 5) The network element of claim 5, wherein the recovery occurs based on the distributed LAG via withdrawal of Ethernet Auto Discovery (AD) routes. ### Claim 7 (depends on 5) The network element of claim 5, wherein, subsequent to the fault and the failure, corresponding traffic is locally switched between the two nodes. ### Claim 8 A method, implemented by a network element configured to implement an Ethernet Virtual Private Network (EVPN) Virtual Private Wire Service (VPWS) local switching service, the method comprising: operating a set of ports in a distributed Link Aggregation Group (LAG) with at least two nodes; operating an inter-chassis link with a second network element; and responsive to a failure of the inter-chassis link, coordinating a distribution state of members in the distributed LAG utilizing a common VPWS that includes a plurality of members with different Ethernet Segment Instances (ESI) such that all of the plurality of members are configured with a same distribution state. ### Claim 9 (depends on 8) The method of claim 8, wherein the distribution state is coordinated based on detection of a member being out-of-distribution. ### Claim 10 (depends on 8) The method of claim 8, wherein the coordinating includes taking all the plurality of members of the common VPWS out-of-distribution when any of the plurality of members is out-of-distribution. ### Claim 11 (depends on 10) The method of claim 10, wherein the common VPWS is based on a normalized Virtual Local Area Network (VLAN) Identifier (VID). ### Claim 12 (depends on 8) The method of claim 8, wherein the failure of the inter-chassis link is subsequent to a fault affecting a port in the set of ports, where recovery occurs based on the distributed LAG. ### Claim 13 (depends on 12) The method of claim 12, wherein the recovery occurs based on the distributed LAG via withdrawal of Ethernet Auto Discovery (AD) routes. ### Claim 14 (depends on 12) The method of claim 12, wherein, subsequent to the fault and the failure, corresponding traffic is locally switched between the two nodes. ### Claim 15 A network configured to implement an Ethernet Virtual Private Network (EVPN) Virtual Private Wire Service (VPWS) local switching service, the network comprising: a first network element and a second network element each in a distributed Link Aggregation Group (LAG), and with an inter-chassis link between the first network element and the second network element, wherein, responsive to a failure of the inter-chassis link, a distribution state of members in the distributed LAG is coordinated utilizing a common VPWS that includes a plurality of members with different Ethernet Segment Instances (ESI) such that all of the plurality of members are configured with a same distribution state. ### Claim 16 (depends on 15) The network of claim 15, wherein the distribution state is coordinated based on detection of a member being out-of-distribution. ### Claim 17 (depends on 15) The network of claim 15, wherein the distribution state is coordinated by taking all the plurality of members of the common VPWS out-of-distribution when any of the plurality of members is out-of-distribution. ### Claim 18 (depends on 17) The network of claim 17, wherein the common VPWS is based on a normalized Virtual Local Area Network (VLAN) Identifier (VID). ### Claim 19 (depends on 15) The network of claim 15, wherein the failure of the inter-chassis link is subsequent to a fault affecting a port in the distributed LAG, where recovery occurs based on the distributed LAG. ### Claim 20 (depends on 19) The network of claim 19, wherein the recovery occurs based on the distributed LAG via withdrawal of Ethernet Auto Discovery (AD) routes.