# US 10,122,617 B2 · Method and apparatus for implementing redundancy protection

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- Number: US 10,122,617 B2
- Document ID: US10122617B2
- Status: Granted
- Kind: B2
- Application number: 15/029,976
- Filed: 2014-06-20
- Published: 2016-10-20
- Granted: 2018-11-06
- Earliest claimed: 2013-10-18
- Assignees: Zte Corporation
- Applicants: Zte Corporation
- Inventors: Fang Hu; Xingfei Yin
- Web page: https://patentgrep.com/patent/US10122617B2

## CPC

- H04L 45/58: Association of routers
- H04L 43/0811: by checking connectivity
- H04L 43/0823: Errors, e.g. transmission errors
- H04L 43/10: Active monitoring, e.g. heartbeat, ping or trace-route
- H04L 45/16: Multipoint routing
- H04L 45/28: using route fault recovery
- H04L 49/557: {Error correction, e.g. fault recovery or fault tolerance}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for implementing redundancy protection applied in a first router includes: providing a first protection group comprising one active interface and any number of inactive interfaces selected from interfaces of the first router, wherein all interfaces in the first protection group serve to distribute or receive multicast traffic; activating Bidirectional Forwarding Detection BFD protocol only at the active interface in the first protection group, so as to enable the active interface in the first protection group to establish interaction with an active interface in a second protection, wherein a second router determines a status of the active interface in the first protection group through the active interface in the second protection group; and stopping all interfaces in the first protection group to distribute or receive the multicast traffic when failure occurs at the active interface in the first protection group.

## Claims

### Claim 1

A method for implementing redundancy protection, applied in a first router, comprising:
providing a first protection group comprising one father interface and any number of child interfaces selected from interfaces of the first router, wherein all interfaces in the first protection group serve to distribute or receive multicast traffic;
activating Bidirectional Forwarding Detection (BFD) protocol only at the father interface in the first protection group, enabling the father interface in the first protection group to establish interaction with a father interface in a second protection group, wherein a second router determines a status of the father interface in the first protection group through the father interface in the second protection group; wherein all interfaces in the second protection group are selected from interfaces of the second router and serve as backup interfaces for the first protection group, and the second protection group comprises one father interface; and
changing a forwarding status of the father interface in the first protection group to stop the father interface to distribute or receive the multicast traffic, and enabling the child interfaces in the first protection group to inherit a changed forwarding status of the father interface.

### Claim 2

A method for implementing redundancy protection, applied in a second router, comprising:
providing a second protection group comprising one father interface and any number of child interfaces selected from interfaces of the second router and serving as backup interfaces for a first protection group, wherein all interfaces in the first protection group are selected from interfaces of a first router and serve to distribute or receive multicast traffic, and the first protection group comprises one activate interface;
activating Bidirectional Forwarding Detection (BFD) protocol only at the father interface in the second protection group, enabling the father interface in the second protection group to establish interaction with the father interface in the first protection, wherein the second router determines a status of the father interface in the first protection group through the father interface in the second protection group; and
changing a forwarding status of the father interface in the second protection group to enable the father interface in the second protection group to displace the father interface in the first protection group for serving to distribute or receive the multicast traffic, and enabling the child interfaces in the second protection group to inherit a changed forwarding status of the father interface.

### Claim 3

An apparatus for implementing redundancy protection, applied in a first router, comprising:
a processor; and
a memory configured to store instructions executable by the processor;
wherein, the processor is configured to perform:
providing a first protection group comprising one father interface and any number of child interfaces selected from interfaces of the first router, wherein all interfaces in the first protection group serve to distribute or receive multicast traffic;
activating Bidirectional Forwarding Detection (BFD) protocol only at the father interface in the first protection group, enabling the father interface in the first protection group to establish interaction with a father interface in a second protection group, wherein a second router determines a status of the father interface in the first protection group through the father interface in the second protection group; wherein all interfaces in the second protection group are selected from interfaces of the second router and serve as backup interfaces for the first protection group, and the second protection group comprises one father interface; and
changing a forwarding status of the father interface in the first protection group to stop the father interface to distribute or receive the multicast traffic, and enabling the child interfaces in the first protection group to inherit a changed forwarding status of the father interface.

### Claim 4

An apparatus for implementing redundancy protection, applied in a second router, comprising:
a processor; and
a memory configured to store instructions executable by the processor;
wherein, the processor is configured to perform:
providing a second protection group comprising one father interface and any number of child interfaces selected from interfaces of the second router and serving as backup interfaces for a first protection group, wherein all interfaces in the first protection group are selected from interfaces of a first router and serve to distribute or receive multicast traffic, and the first protection group comprises one activate interface;
activating Bidirectional Forwarding Detection (BFD) protocol only at the father interface in the second protection group, enabling the father interface in the second protection group to establish interaction with the father interface in the first protection, wherein the second router determines a status of the father interface in the first protection group through the father interface in the second protection group; and
changing a forwarding status of the father interface in the second protection group to enable the father interface in the second protection group to displace the father interface in the first protection group for serving to distribute or receive the multicast traffic, and enabling the child interfaces in the second protection group to inherit a changed forwarding status of the father interface.