# US 2026/0100903 A1 · Reliable transmission of messages in packet networks

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- Number: US 2026/0100903 A1
- Document ID: US20260100903A1
- Status: Published application
- Kind: A1
- Application number: 18/905,562
- Filed: 2024-10-03
- Published: 2026-04-09
- Earliest claimed: 2024-10-03
- Assignees: Cisco Technology, Inc.
- Applicants: Cisco Technology, Inc.
- Inventors: Bharath VASUDEVAN; Christian SCHMUTZER
- Web page: https://patentgrep.com/patent/US20260100903A1

## CPC

- H04L 12/40176: {involving redundancy (error detection or correction of the data by redundancy in hardware using active fault-masking in interconnections G06F11/2002; error detection or correction of the data by redundancy in hardware using active fault-masking in storage systems using spares or by reconfiguring G06F11/2053)}
- H04L 45/22: {Alternate routing}
- H04B 10/032: using working and protection systems {(H04J14/0287 takes precedence)}
- H04L 12/437: Ring fault isolation or reconfiguration {(for SDH/SONET ring networks H04J3/085)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

Methods, systems, and computer program products are provided for transmitting data in a packet network. In various embodiments, a method includes: determining, by a first node, automatic protection switching (APS) information associated with the first node; initiating, by the first node, a timer based on the APS information; communicating, by the first node to a second node over the packet network, a first message including the APS information; receiving, by the first node, a second message from the second node, the second message including APS information associated with the second node, the APS information associated with the second node including a priority associated with an APS state of the second node; and selectively synchronizing, by the first node, an APS state of the first node with the APS state of the second node based on the timer and the APS information of the second message.

## Claims

### Claim 1

A method for transmitting data in a packet network, comprising:
determining, by a first node, automatic protection switching (APS) information associated with the first node;
initiating, by the first node, a timer based on the APS information;
communicating, by the first node to a second node over the packet network, a first message including the APS information;
receiving, by the first node, a second message from the second node, the second message including APS information associated with the second node, the APS information associated with the second node including a priority associated with an APS state of the second node; and
selectively synchronizing, by the first node, an APS state of the first node with the APS state of the second node based on the timer and the APS information of the second message.

### Claim 2 (depends on 1)

The method of claim 1, further comprising re-communicating, by the first node to the second node over the packet network, the first message including the APS information based on the timer.

### Claim 3 (depends on 1)

The method of claim 1, further comprising stopping, by the first node, the timer based on the APS information of the second node.

### Claim 4 (depends on 3)

The method of claim 3, wherein the stopping the timer comprises stopping the timer when the priority associated with the APS state of the second node is equal to a priority of the APS information of the first node.

### Claim 5 (depends on 3)

The method of claim 3, wherein the stopping the timer comprises stopping the timer when the priority associated with the APS state of the second node is higher than a priority of the APS information of the first node.

### Claim 6 (depends on 1)

The method of claim 1, wherein the APS information of the first node includes a priority associated with the APS state of the first node.

### Claim 7 (depends on 1)

The method of claim 1, wherein the APS information of the first node includes a working entity.

### Claim 8 (depends on 1)

The method of claim 1, wherein the APS information of the first node includes a bridge state.

### Claim 9 (depends on 1)

The method of claim 1, wherein the APS information of the second node includes a priority associated with an APS state of the second node.

### Claim 10

A system for transmitting data in a packet network, comprising:
a first node within the packet network and configured to, by a processor, determine automatic protection switching (APS) information associated with the first node, initiate a timer based on the APS information, communicate, to a second node over the packet network, a first message including the APS information, receive a second message from the second node, the second message including APS information associated with the second node, the APS information associated with the second node including a priority associated with an APS state of the second node, and selectively synchronize an APS state of the first node with the APS state of the second node based on the timer and the APS information of the second message.

### Claim 11 (depends on 10)

The system of claim 10, wherein the first node is further configured to re-communicate to the second node over the packet network, the first message including the APS information based on the timer.

### Claim 12 (depends on 10)

The system of claim 10, wherein the first node is further configured to stop the timer based on the APS information of the second node.

### Claim 13 (depends on 12)

The system of claim 12, wherein the first node is further configured to stop the timer when the priority associated with the APS state of the second node is equal to a priority of the APS information of the first node.

### Claim 14 (depends on 12)

The system of claim 12, wherein the first node is further configured to stop the timer when the priority associated with the APS state of the second node is higher than a priority of the APS information of the first node.

### Claim 15 (depends on 10)

The system of claim 10, wherein the APS information of the first node includes a priority associated with the APS state of the first node.

### Claim 16 (depends on 10)

The system of claim 10, wherein the APS information of the first node includes a working entity.

### Claim 17 (depends on 10)

The system of claim 10, wherein the APS information of the first node includes a bridge state.

### Claim 18 (depends on 10)

The system of claim 10, wherein the APS information of the second node includes a priority associated with an APS state of the second node.

### Claim 19 (depends on 10)

The system of claim 10, wherein the packet network uses at least one of Private Line Emulation (PLE) and ethernet.

### Claim 20 (depends on 10)

The system of claim 10, wherein the packet network includes a hybrid network of a packet network and an optical transport network (OTN).