# US 2025/0097739 A1 · Replicating traffic communicated over satellite networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0097739 A1 - Document ID: US20250097739A1 - Status: Published application - Kind: A1 - Application number: 18/470,653 - Filed: 2023-09-20 - Published: 2025-03-20 - Earliest claimed: 2023-09-20 - Assignees: Cisco Technology, Inc. - Applicants: Cisco Technology, Inc. - Inventors: Thomas Szigeti; David John Zacks; Robert Edgar Barton; Jeff Apcar - Web page: https://patentgrep.com/patent/US20250097739A1 ## CPC - H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks - H04W 24/04: Arrangements for maintaining operational condition - H04B 7/185: Space-based or airborne stations; {Stations for satellite systems}(H04B7/204 takes precedence) - H04L 45/22: {Alternate routing} - H04L 45/24: Multipath - H04W 40/12: based on transmission quality or channel quality - H04W 76/15: Setup of multiple wireless link connections - H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract Techniques for a proxy to replicate traffic being communicated between a client device and a destination device based on determining an outage or impairment in a LEO satellite network. The proxy may be communicating a traffic stream between a source device and a destination device using a primary WAN that includes the LEO satellite network. However, the proxy may determine that the primary WAN has experienced or will experience an outage or other impairment. In such examples, the proxy may then replicate the traffic stream and send the replicated traffic stream over a backup communication link. The backup communication link may a different path through the primary WAN, and/or may be a communication path through a secondary WAN. Once the outage or impairment has cleared, the proxy may stop replicating the traffic and again use the primary WAN to communicate traffic. ## Claims ### Claim 1 A method comprising: establishing a primary communication link over a first Wide Area Network (WAN) to communicate data between a first device and a second device, the first WAN including a low Earth orbit (LEO) satellite network; establishing a backup communication link over at least one of the first WAN or a second WAN; communicating a traffic stream between the first device and the second device using the primary communication link; monitoring performance of the primary communication link during communication of the traffic stream to generate performance data; determining, using the performance data, an outage or impairment associated with the primary communication link; based at least in part on determining the outage or impairment, replicating a portion of the traffic stream that is to be communicated via the primary communication link to generate a replicated traffic stream; communicating the portion of the traffic stream using the primary communication link during a period of time; and communicating the replicated traffic stream using the backup communication link at least partly during the period of time. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining that the outage or impairment associated with the primary communication link has cleared; and based at least in part on determining the outage or impairment has cleared, stopping the replicating of the traffic stream. ### Claim 3 (depends on 1) The method of claim 1, further comprising: encapsulating first packets of the portion of the traffic stream with first replication wrappers, the first replication wrappers including: a source identifier (ID) associated with a source router of the traffic stream; a replication ID associated with a replication session on the source router, the replication session including the traffic stream and the replicated traffic stream; and replication counter values that indicate first relative positions for each of the first packets in the traffic session; and encapsulating second packets of the replicated traffic stream with second replication wrappers, the second replication wrappers including: the source ID associated with the source router of the replicated traffic stream; the replication ID associated with the replication session on the source router; and the replication counter values that indicate second relative positions for each of the second packets in the replicated traffic stream. ### Claim 4 (depends on 3) The method of claim 3, further comprising: receiving, at a remote router associated with the second device, the first packets of the traffic stream and the second packets of the replicated traffic stream; identifying, at the remote router, a first replication counter value in a first replication wrapper of a first packet; forwarding, from the remote router, the first packet of the first packets to the second device; storing an indication that the first packet having the first replication counter value was forwarded from the remote router and to the second device; identifying the first replication counter value in a second replication wrapper of a second packet; and dropping the second packet based at least in part on the indication that the first packet having the first replication counter value was forwarded from the remote router and to the second device. ### Claim 5 (depends on 3) The method of claim 3, further comprising: determining that the outage or impairment associated with the primary communication link has cleared; and based at least in part on determining the outage or impairment has cleared, stopping encapsulation of subsequent packets in the traffic stream. ### Claim 6 (depends on 1) The method of claim 1, wherein: the backup communication link is communicated over the second WAN; and the second WAN is a terrestrial WAN. ### Claim 7 (depends on 1) The method of claim 1, wherein the establishing of the primary communication link and the backup communication link, the monitoring the performance of the primary communication link, and the replicating of the portion of the traffic stream are performed by a proxy running on a routing device associated with the first device. ### Claim 8 (depends on 1) The method of claim 1, wherein the establishing of the primary communication link and the backup communication link, the monitoring the performance of the primary communication link, and the replicating of the portion of the traffic stream are performed by a client running on the first device. ### Claim 9 A routing device that acts as a proxy for a client device, the routing device comprising: one or more processors; and one or more non-transitory computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising: establishing a primary communication link over a first Wide Area Network (WAN) to communicate data between the client device device and a remote device, the first WAN including a low Earth orbit (LEO) satellite network; establishing a backup communication link with the remote device over at least one of the first WAN or a second WAN; communicating a traffic stream between the client device and the remote device using the primary communication link; monitoring performance of the primary communication link during communication of the traffic stream to generate performance data; predicting, using the performance data, an outage or impairment associated with the primary communication link; based at least in part on determining the outage or impairment, replicating a portion of the traffic stream that is to be communicated via the primary communication link to generate a replicated traffic stream; communicating the portion of the traffic stream using the primary communication link during a period of time; and communicating the replicated traffic stream using the backup communication link at least partly during the period of time. ### Claim 10 (depends on 9) The routing device of claim 9, the operations further comprising: determining that the outage or impairment associated with the primary communication link has cleared; and based at least in part on determining the outage or impairment has cleared, stopping the replicating of the traffic stream. ### Claim 11 (depends on 9) The routing device of claim 9, the operations further comprising: encapsulating first packets of the portion of the traffic stream with first replication wrappers, the first replication wrappers including: a source identifier (ID) associated with a source router of the traffic stream; a replication ID associated with a replication session on the source router, the replication session including the traffic stream and the replicated traffic stream; and replication counter values that indicate first relative positions for each of the first packets in the traffic session; and encapsulating second packets of the replicated traffic stream with second replication wrappers, the second replication wrappers including: the source ID associated with the source router of the replicated traffic stream; the replication ID associated with the replication session on the source router; and the replication counter values that indicate second relative positions for each of the second packets in the replicated traffic stream. ### Claim 12 (depends on 11) The routing device of claim 11, the operations further comprising: receiving, at the remote device, the first packets of the traffic stream and the second packets of the replicated traffic stream; identifying, at the remote device, a first replication counter value in a first replication wrapper of a first packet; forwarding, from the remote device, the first packet of the first packets to a destination device; storing an indication that the first packet having the first replication counter value was forwarded from the remote device and to the destination device; identifying the first replication counter value in a second replication wrapper of a second packet; and dropping the second packet based at least in part on the indication that the first packet having the first replication counter value was forwarded from the remote device and to the destination device. ### Claim 13 (depends on 11) The routing device of claim 11, the operations further comprising: determining that the outage or impairment associated with the primary communication link has cleared; and based at least in part on determining the outage or impairment has cleared, stopping encapsulation of subsequent packets in the traffic stream. ### Claim 14 (depends on 9) The routing device of claim 9, wherein: the backup communication link is communicated over the second WAN; and the second WAN is a terrestrial WAN. ### Claim 15 One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising: establishing a primary communication link over a first Wide Area Network (WAN) to communicate data between a first device and a second device, the first WAN including a low Earth orbit (LEO) satellite network; establishing a backup communication link over at least one of the first WAN or a second WAN; communicating a traffic stream between the first device and the second device using the primary communication link; monitoring performance of the primary communication link during communication of the traffic stream to generate performance data; determining, using the performance data, an outage or impairment associated with the primary communication link; based at least in part on determining the outage or impairment, replicating a portion of the traffic stream that is to be communicated via the primary communication link to generate a replicated traffic stream; communicating the portion of the traffic stream using the primary communication link during a period of time; and communicating the replicated traffic stream using the backup communication link at least partly during the period of time. ### Claim 16 (depends on 15) The one or more non-transitory computer-readable media of claim 15, the operations further comprising: determining that the outage or impairment associated with the primary communication link has cleared; and based at least in part on determining the outage or impairment has cleared, stopping the replicating of the traffic stream. ### Claim 17 (depends on 15) The one or more non-transitory computer-readable media of claim 15, the operations further comprising: encapsulating first packets of the portion of the traffic stream with first replication wrappers, the first replication wrappers including: a source identifier (ID) associated with a source router of the traffic stream; a replication ID associated with a replication session on the source router, the replication session including the traffic stream and the replicated traffic stream; and replication counter values that indicate first relative positions for each of the first packets in the traffic session; and encapsulating second packets of the replicated traffic stream with second replication wrappers, the second replication wrappers including: the source ID associated with the source router of the replicated traffic stream; the replication ID associated with the replication session on the source router; and the replication counter values that indicate second relative positions for each of the second packets in the replicated traffic stream. ### Claim 18 (depends on 17) The one or more non-transitory computer-readable media of claim 17, the operations further comprising: receiving, at a remote router associated with the second device, the first packets of the traffic stream and the second packets of the replicated traffic stream; identifying, at the remote router, a first replication counter value in a first replication wrapper of a first packet; forwarding, from the remote router, the first packet of the first packets to the second device; storing an indication that the first packet having the first replication counter value was forwarded from the remote router and to the second device; identifying the first replication counter value in a second replication wrapper of a second packet; and dropping the second packet based at least in part on the indication that the first packet having the first replication counter value was forwarded from the remote router and to the second device. ### Claim 19 (depends on 15) The one or more non-transitory computer-readable media of claim 15, wherein the establishing of the primary communication link and the backup communication link, the monitoring the performance of the primary communication link, and the replicating of the portion of the traffic stream are performed by a proxy running on a routing device associated with the first device. ### Claim 20 (depends on 15) The one or more non-transitory computer-readable media of claim 15, wherein the establishing of the primary communication link and the backup communication link, the monitoring the performance of the primary communication link, and the replicating of the portion of the traffic stream are performed by a client running on the first device.