CA2471878A1 - System and method for multicast stream failover - Google Patents

System and method for multicast stream failover Download PDF

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Publication number
CA2471878A1
CA2471878A1 CA002471878A CA2471878A CA2471878A1 CA 2471878 A1 CA2471878 A1 CA 2471878A1 CA 002471878 A CA002471878 A CA 002471878A CA 2471878 A CA2471878 A CA 2471878A CA 2471878 A1 CA2471878 A1 CA 2471878A1
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Canada
Prior art keywords
packet
primary
multicast
buffer
stream
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Granted
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CA002471878A
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French (fr)
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CA2471878C (en
Inventor
Kenneth Gould
Michael Sun
Joo C. Chung
Feng Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Time Warner Cable Internet LLC
Original Assignee
Kenneth Gould
Michael Sun
Joo C. Chung
Feng Huang
Road Runner Llc
Serviceco Llc
Cable Holdco Llc
Road Runner Holdco Llc
Time Warner Cable Internet Llc
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Publication date
Application filed by Kenneth Gould, Michael Sun, Joo C. Chung, Feng Huang, Road Runner Llc, Serviceco Llc, Cable Holdco Llc, Road Runner Holdco Llc, Time Warner Cable Internet Llc filed Critical Kenneth Gould
Publication of CA2471878A1 publication Critical patent/CA2471878A1/en
Application granted granted Critical
Publication of CA2471878C publication Critical patent/CA2471878C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
    • G06F11/2038—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant with a single idle spare processing component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1863—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
    • H04L12/1868—Measures taken after transmission, e.g. acknowledgments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0659—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
    • H04L67/1004—Server selection for load balancing
    • H04L67/1023—Server selection for load balancing based on a hash applied to IP addresses or costs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2181—Source of audio or video content, e.g. local disk arrays comprising remotely distributed storage units, e.g. when movies are replicated over a plurality of video servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/64—Addressing
    • H04N21/6405—Multicasting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
    • H04N21/6473—Monitoring network processes errors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/1629—Error detection by comparing the output of redundant processing systems
    • G06F11/1654—Error detection by comparing the output of redundant processing systems where the output of only one of the redundant processing components can drive the attached hardware, e.g. memory or I/O
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/40—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type

Abstract

A system and method for avoiding a single point of failure in the broadcast of streaming data. The system uses multiple redundant servers (10, 12) streaming the exactly same data to a failover device (16). The failover device buffers (20P, 20S) the streams into a primary and secondary data stream and automatically switches from the primary to the secondary data stream if it detects a corruption in the primary data stream. Since the buffered data packets of the two streams are identical and are synchronized, there is not outage for multicast receivers when the primary data source fails since there is a switch to exactly the same data in the next packet of the secondary data stream.

Claims (24)

1. A multicast failover device comprising:
a processor;
at least one primary receiver for receiving packets from at least one primary multicast stream source;
at least one secondary receiver for receiving packets from at least one secondary multicast stream source;
logic for multicasting packets received by the primary multicast stream source over an external network by rewriting an IP header of the packet from the primary multicast stream with a virtual IP address;
logic for detecting an adverse change in a packet from the primary multicast stream; and logic for multicasting a packet from the secondary multicast stream in lieu of multicasting the packet from the primary multicast stream when the adverse change in the packet of the primary multicast, stream is detected by rewriting an IP
header of the packet from the secondary multicast stream with the virtual IP
address.
2. The multicast failover device of claim 1 further comprising:
storage for a primary buffer for storing packets received from the primary multicast stream source; and storage for a secondary buffer for storing packets from the secondary multicast stream source.
3. The multicast failover device of claim 2 further comprises:
logic for multicasting packets from the primary buffer over an external network:

logic for detecting an adverse change in a packet stored in the primary buffer:
and logic for multicasting a packet from the secondary buffer over the external network when the adverse change in the corresponding packet of the primary buffer is detected.
4. The multicast failover device of claim 3 wherein the processor further comprises logic for synchronizing the packets in the primary buffer and the secondary buffer.
5. The multicast failover device of claim 4 wherein the logic for synchronizing packets in the primary buffer and the secondary buffer comprises:
logic for identifying the source of the packet when the packet is from the primary multicast stream source;
logic for identifying the source of the packet when the packet is from the secondary multicast stream source;
logic for identifying a packet's sequential position from a multicast stream;
logic for inserting a primary multicast stream packet in the primary buffer at an offset that maps to the packet's sequential position from the primary multicast stream; and logic for inserting a secondary stream multicast packet in the secondary buffer at an offset that maps to the packet's sequential position from the secondary multicast stream such that the packet in the primary buffer at a specific offset is of the same packet's sequential position as is the packet at the corresponding offset of the secondary buffer.
6. The multicast failover device of claim 5 further comprises logic for multicasting a packet from the secondary multicast buffer when an adverse change in a packet in the primary multicast buffer is detected.
7. The multicast failover device of claim 6 wherein the packets in the primary buffer further comprises a first IP header associated with a primary multicast stream server and wherein the packets in the secondary buffer comprises a second IP
header associated with a second multicast stream server: and wherein the processor further comprises:
logic for rewriting the first IP header with a virtual multicast IP address and port number when a packet from the primary buffer is multicast on the external network; and logic for rewriting the second IP header with a virtual multicast IP address and port number when a packet from the secondary buffer is multicast on the external network
8. The multicast failover device of claim 7 wherein the processor further comprises logic for multicasting the packet next in sequential position relative to the last packet multicast by the failover device such that the packet stream multicast by the failover device is continuous and the packet sequence position integrity is maintained.
9. A system for reliable multicasting of streaming data comprising:
primary stream packets having a first multicast IP address and port number;
secondary stream packets having a second multicast IP address and port number:
an enterprise network on which the sources for primary stream packets and secondary stream packets are connected;
a multicast failover device connected to the enterprise network comprises:
a receiver for receiving the primary multicast stream packets;
a receiver for receiving a secondary multicast stream of packet;
an external network for transmitting multicast stream packets to at least one user;

logic for multicasting the primary multicast stream packets over the external network by rewriting an IP header of the packet from the primary multicast stream with a virtual IP address;
logic for detecting an adverse change in a packet from the primary multicast stream;
logic for multicasting a secondary multicast stream packet over the external network in lieu of multicasting the primary multicast stream packet when the adverse change in the primary multicast stream packet is detected by rewriting an IP header of the packet from the secondary multicast stream with the virtual IP address.
10. The system of claim 9 further comprising:
storage for a primary buffer for storing the primary multicast stream packets;
and storage for a secondary buffer for storing the secondary multicast stream packets.
11. The system of claim 10 further comprising:
logic for multicasting packets from the primary buffer over the external network;
logic for detecting an adverse change in a packet stored in the primary buffer:
and logic for multicasting a packet from the secondary buffer over the external network when the adverse change in the corresponding packet of the primary buffer is detected.
12. The system of claim 11 further comprising logic for synchronizing the packets in the primary buffer and the secondary buffer.
13. The system of claim 12 wherein the logic for synchronizing packets in the primary buffer and the secondary buffer comprises:

logic for identifying when a packet is from the primary stream;
logic for identifying when a packet is from the secondary stream;
logic for identifying a packet's sequential position from the primary stream:
logic for identifying a packet's sequential position from the secondary stream;
logic for inserting a primary stream packet in the primary buffer at an offset that maps to the packet's sequential position from the primary stream; and logic for inserting a secondary stream packet in the secondary buffer at an offset that maps to the packet's sequential position from the secondary stream such that a packet in the primary buffer at a specific offset is of the same packet's sequential position as is the packet at the corresponding offset of the secondary buffer.
14. The system of claim 13 wherein the multicast failover device further comprises logic for multicasting a packet from the secondary buffer when an adverse change in a packet in the primary buffer is detected.
15. The system of claim 14 further comprises:
logic for rewriting the IP address and port number of a packet of the primary buffer with a virtual IP address and port number when a primary buffer packet is multicast over the external network; and logic for rewriting the IP address and port number of a packet of the secondary buffer with the virtual IP address and port number when a secondary buffer packet is multicast over the external network.
16. The system of claim 15 further comprising logic for multicasting the packet next in sequential position such that the packet stream multicast by the system continuous and the packet order integrity is maintained irrespective of the buffer location that the packet had been stored such that the clients detect no outage, discontinuity or quality loss.
17 17. A method for reliably multicasting data comprising:
receiving over an enterprise network primary multicast stream packets from a primary multicast stream server, said packets having a first multicast IP
address and port number;
receiving over an enterprise network secondary multicast stream packets from a secondary multicast stream server, said packets having a second multicast IP
address and port number;
multicasting the primary multicast stream packets over an external network by rewriting an IP header of the packet from the primary multicast stream with a virtual IP address;
detecting an adverse change in a packet from the primary multicast stream;
multicasting a secondary multicast stream packet over the external network in lieu of multicasting the primary multicast stream when the adverse change in the packet of the primary multicast stream is detected by rewriting an IP header of the packet from the secondary multicast stream with the virtual IP address.
18. The method of claim 17 further comprising:
storing packets received from the primary multicast stream source; and storing packets from the secondary multicast stream source.
19. The method of claim 18 further comprising further comprises:
multicasting packets from the primary buffer over an external network;
detecting an adverse change in a packet stored in the primary buffer: and multicasting a packet from the secondary buffer over the external network when the adverse change in the corresponding packer of the primary buffer is detected.
20. The method of claim 19 further comprises synchronizing the packets in the primary buffer and the secondary buffer.
21. The method of claim 20 wherein the synchronizing packets in the primary buffer and the secondary buffer comprises:
identifying the source of the packet when the packet is from the primary multicast stream source;
identifying the source of the packet when the packet is from the secondary multicast stream source;
identifying a packet's sequential position from a multicast stream;
inserting a primary multicast stream packet in the primary buffer at an offset that maps to the packet's sequential position from the primary multicast stream;
and inserting a secondary stream multicast packet in the secondary buffer at an offset that maps to the packet's sequential position from the secondary multicast stream such that the packet in the primary buffer at a specific offset is of the same packet's sequential position as is the packet at the corresponding offset of the secondary buffer.
22. The method of claim 21 further comprises multicasting a packet front the secondary multicast buffer when an adverse change in a packet in the primary multicast buffer is detected.
23. The method of claim 22 further comprises rewriting IP header information in the packet being multicast on the external network with a virtual multicast IP
address and port number when the source of the packet is the primary buffer and when the source of the packet is the secondary buffer.
24. The method of claim 23 further comprises multicasting the packet next in sequential position relative to the last packet multicast on the external network such that the packet stream multicast is continuous and the packet sequence position integrity is maintained.
CA2471878A 2000-12-29 2001-12-28 System and method for multicast stream failover Expired - Lifetime CA2471878C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/752,744 2000-12-29
US09/752,744 US6839865B2 (en) 2000-12-29 2000-12-29 System and method for multicast stream failover
PCT/US2001/049499 WO2002067120A1 (en) 2000-12-29 2001-12-28 System and method for multicast stream failover

Publications (2)

Publication Number Publication Date
CA2471878A1 true CA2471878A1 (en) 2002-08-29
CA2471878C CA2471878C (en) 2011-08-30

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Country Link
US (1) US6839865B2 (en)
EP (1) EP1358553B1 (en)
AT (1) ATE547754T1 (en)
AU (1) AU2002251697A1 (en)
CA (1) CA2471878C (en)
WO (1) WO2002067120A1 (en)

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US6839865B2 (en) 2005-01-04
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