WO2014101185A1

WO2014101185A1 - Method, apparatus and system for detecting performance of multicast channel

Info

Publication number: WO2014101185A1
Application number: PCT/CN2012/088047
Authority: WO
Inventors: 陈欢
Original assignee: 华为技术有限公司
Priority date: 2012-12-31
Filing date: 2012-12-31
Publication date: 2014-07-03
Also published as: CN104067559A; CN104067559B

Abstract

A system for detecting performance of multicast channels is provided in the present invention. The system includes a first multicast device and a second multicast device. The first multicast device is used for constructing a detection message, which carries a count value of the multicast messages that are sent by the first multicast device through a multicast channel to be detected among multiple multicast channels, or carries time information about sending the detection message by the first multicast device; the destination address information of the detection message is same as the destination address of the multicast message transmitted through the multicast channel to be detected; and for sending the detection message according to the destination address information of the detection message. The second multicast device is used for receiving the detection message, extracting the count value in the detection message, and calculating, according to the count value of the multicast messages received through the multicast channel to be detected, the packet loss rate of the multicast channel to be detected; or extracting the time information in the detection message, and calculating the delay of the multicast channel to be detected according to the extracted time information and the time information about receiving the detection messages locally.

Description

Multi-channel channel performance detection method, device and system

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for detecting performance of a multicast channel.

Background technique

At present, the IPTV service on the network uses point-to-multipoint multicast technology. The multicast system consists of a video multicast service system, an IP (Internet Protocol) metropolitan area network, an access network, and a home network. .

The video multicast service system implements video user management, CA (Certificate Authority), DRM (Digital Rights Management), and video encoding functions, and sends the video service stream to the IP metropolitan area network.

The IP metropolitan area network transmits the video service stream to the broadband access network through the IP multicast function;

The broadband access network implements the control function of joining or leaving the video group, and sends the video stream (communication message) required by the user to the user.

Multicast packet forwarding can have Layer 2 forwarding and Layer 3 forwarding. Layer 2 forwarding is based on multicast packets.

The VLAN (Virtual Local Access Network) ID and the destination MAC (Media Access Control) address look up the corresponding forwarding table and forward it according to the port in the forwarding table. The Layer 3 forwarding is based on the VLAN ID of the multicast packet and the destination IP address. The corresponding forwarding is performed according to the corresponding port in the forwarding table.

The packet loss and jitter in the multicast path are critical to the user experience of the video service. How to monitor the video transmission quality of the network and locate the fault is a problem that operators pay close attention to. Summary of the invention

An embodiment of the present invention provides a performance detection system for a multicast channel, including a first multicast device and a second multicast device, and a multicast path between the first multicast device and the second multicast device. There are multiple multicast channels, and the multiple multicast channels are used to transmit multicast packets with different destination address information. The first multicast device is configured to construct a detection packet, where the detection packet carries First multicast The device receives the count value of the packet sent by the multicast channel to be detected by the multicast channel, or carries the time information of the first multicast device to send the detection packet; The destination address information of the packet is the same as the destination address information of the multicast packet transmitted by the multicast channel to be detected; and the detection packet is sent according to the destination address information of the detection packet;

The second multicast device is configured to receive the detection packet, and when the detection packet carries a count value, extract a count value in the detection packet, according to the extracted count value and the slave Determining, by the count value of the packet received by the multicast channel, the packet loss rate of the multicast channel to be detected; or extracting the time in the detection packet when the time information is carried in the detection packet The information is used to calculate a delay of the multicast channel to be detected according to the extracted time information and time information of the locally received detection packet.

The destination address information may be a combination of an Internet Protocol IP address and a virtual local area network identification VLAN ID, or a combination of a media access control MAC address and a VLAN ID.

Further, the detecting packet is an operation, management, and maintenance OAM packet, and the first multicast device is further configured to encapsulate the OAM packet by using a user datagram protocol UDP.

Further, the detection packet further carries a dedicated user datagram protocol UDP port information, and the second multicast device is further configured to detect whether the received packet carries the set dedicated UDP port information or the agreed The identifier, if any, determines that the received message is a detection message.

An embodiment of the present invention provides a method for detecting a performance of a multicast channel. The multicast path between the first multicast device and the second multicast device has multiple multicast channels, and the multiple multicast channels are used. A multicast packet that transmits different destination address information, where the method includes:

The first multicast device constructs a detection packet, where the detection packet carries a count value of a packet sent by the first multicast device through a multicast channel to be detected by the multiple multicast channels. The destination address information of the detected packet is the same as the destination address information of the multicast message transmitted by the multicast channel to be detected;

The first multicast device sends the detection packet according to the destination address information, so that the second multicast device receives the detection packet, and extracts a count value in the detection packet, according to the Calculating a packet loss rate of the multicast channel to be detected, and a count value of the received packet and a count value of the packet received from the multicast channel to be detected;

Or The first multicast device constructs a detection packet, where the detection packet carries time information of the first multicast device to send the detection packet, and the destination address information of the detection packet is to be detected. The destination address information of the multicast >3⁄4 text transmitted by the multicast channel is the same;

The first multicast device sends the detection packet according to the destination address information, so that the second multicast device receives the detection packet, and extracts time information in the detection packet, according to the extracted The time information and the time information of the locally received detection packet are used to calculate the delay of the multicast channel to be detected.

The destination address information is a combination of an Internet Protocol IP address and a virtual local area network identification VLAN ID, or a combination of a media access control MAC address and a VLAN ID.

Further, the detection packet further carries a dedicated user datagram protocol UDP port information, where the UDP port information is used to identify the detection packet.

An embodiment of the present invention provides a multicast device, including:

a multicast path interface, configured to connect to the second multicast device, where the multicast path between the multicast path interface and the second multicast device has multiple multicast channels, where the multiple multicast channels are used. Multicast "^ text for transmitting different destination address information;

a processor, configured to construct a detection packet, where the detection packet carries a count value of a packet sent by the current multicast device through one of the plurality of multicast channels to be detected, or carries the The current multicast device sends the time information of the detection packet; the destination address information of the detection packet is the same as the destination address information of the multicast message transmitted by the multicast channel to be detected;

And a data transmitter, configured to send the detection packet according to the destination address information.

Further, the detecting packet is an operation, management, and maintenance OAM packet, and the processor is further configured to encapsulate the OAM packet into a user datagram protocol UDP packet.

The multicast device is a multicast server, a digital subscriber line access multiplexer DSLAM, a ray path terminal OLT, a multi-service access node MS AN or a router.

The multicast device provided in this embodiment can detect the performance of the specific multicast channel. By using the multicast device provided in this embodiment, the fault of the specific multicast channel can be quickly located. DRAWINGS The drawings used in the description of the embodiments are briefly described. Obviously, only a part of the embodiments of the present invention are described in the following drawings, and other drawings or drawings may be obtained according to the drawings and descriptions without any creative work by those skilled in the art. The embodiments are intended to cover all such derived figures or embodiments.

1 is a simplified structural diagram of a performance detection system for a multicast channel according to an embodiment of the present invention; FIG. 2 is a flowchart of a method for detecting performance of a multicast channel according to Embodiment 1 of the present invention; A schematic diagram of a sending process of detecting a message;

4 is a schematic diagram of a frame structure of a UDP packet according to Embodiment 1 of the present invention;

5 is a flowchart of a method for detecting performance of a multicast channel according to Embodiment 2 of the present invention; FIG. 6 is a schematic diagram of a structure of a multicast device according to Embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of a structure of a multicast device according to Embodiment 3 of the present invention. Specific embodiment

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present invention. As an example, the system in FIG. 1 includes a routing device 10, a routing device 20, an access device 30, and other devices. The embodiment of the present invention does not limit the specific multicast device configuration of the routing device 10, the routing device 20, and the location where the access device 30 is located.

The multicast path between the routing device 10 and the routing device 20 is configured with at least two multicast channels, and each multicast channel is used for transmitting multicast messages of different destination addresses. The multicast path can be a physical channel, and the multicast channel can be a logical channel on the multicast path. If it is a Layer 2 network, the destination address of the multicast packet transmitted by the multicast channel can be a combination of the MAC address and the VLAN ID. If it is a Layer 3 network, the destination address of the multicast message transmitted by the multicast channel can be IP. Combination with VLAN ID.

A multicast device, such as the routing device 20 or the access device 30, can replicate multicast packets. It is sent in the downstream direction through different multicast channels.

In Figure 1, the performance of each multicast channel between the multicast device and the multicast device needs to be detected, such as each multicast channel or routing device 20 and access device between the routing device 10 and the routing device 20. Each multicast channel between 30, etc., obtains performance parameters such as packet loss rate, delay, and jitter of the corresponding multicast channel.

The existing detection mode can only be that the multicast stream source adds the RTP (Real-Time Transport Protocol) encapsulation to the multicast sequence to transmit the serial number or time stamp of the multicast packet. The intermediate device copies the multicast packets and forwards the multicast packets according to the multicast forwarding table. The existing mode can only detect the packet loss rate or delay of the multicast source to the replication point. The parameter, the performance parameter of the intermediate copy point to the copy point cannot be detected. Embodiment 1

To solve the above problem, the embodiment provides a performance detection method for a multicast channel, and the performance detection method can detect a packet loss rate of a multicast channel between the first multicast device and the second multicast device. . The method provided is as shown in FIG. 2, and may include the following steps:

Step 200: The first multicast device constructs a detection packet, and the detection packet carries a count value of a packet sent by the first multicast device by using one of the at least two multicast channels to be detected.

The multicast path between the first multicast device and the second multicast device has at least two multicast channels, and each multicast channel is configured to transmit multicast packets with different destination addresses, if the first multicast device The multicast packet between the multicast device and the second multicast device can be forwarded by the Layer 2 network. The destination address of the multicast packet transmitted by each multicast channel can be identified by the combination of the MAC address and the VLAN ID. The multicast packet between the broadcast device and the second multicast device needs to be forwarded by the Layer 3 network. The destination address of the multicast packet transmitted by each multicast channel can be identified by a combination of IP and VLAN ID.

The destination address information of the detection packet of the first multicast device is the same as the destination address of the multicast packet transmitted by the multicast channel to be detected, so that the specified multicast channel can be detected.

Referring to FIG. 1, the first multicast device is the routing device 10, and the second multicast device is the routing device 20. There are three multicast channels between the routing device 10 and the routing device 20. If the packet loss rate of the second multicast channel needs to be detected, the destination address information of the detection packet constructed by the routing device 10 needs to be related to the second packet. The destination address information of multicast packets transmitted on the multicast channel is the same. The first multicast device may carry the count value in the payload of the detection message. As an example, the detection packet can be a management packet or other non-multicast protocol packet. The management packet can be OAM (Operation, Administration, and Maintenance) or OMCI (Optical Network Terminal). The management and control interface (optical network terminal management control interface), etc., may also be other custom management messages, etc., and the count value may be carried in the payload of the management message.

The first multicast device may also use the UDP (User Datagram Protocol) to encapsulate the detection packet, and the encapsulated UDP payload is the payload of the detection packet to detect the packet. As an example of an OAM packet, the encapsulated UDP packet can be as shown in FIG. 4, including an Ethernet header, an IP header, a UDP header, and a payload. The Ethernet header includes a destination MAC address (DMAC), a source MAC address (SMAC), a virtual local area network identifier (VLAN tag), and an Ethernet type (Ethtype). The IP header includes source IP and destination IP. The UDP header includes the source port (source port) and the destination port. In order to enable the receiver to identify the detection packet, you can add a dedicated UDP port number to the detection packet. This can be distinguished from the normal multicast stream. According to the UDP port in the detection packet, it is detected that the identifier is detected. Of course, the agreed identifier may also be added to the payload, and the receiving end may also identify the detection according to the identifier in the detection payload. Text.

The first multicast device forwards the detection packet according to the destination address information of the detection packet, and the device that sets the detection point on the multicast path receives the detection packet.

For details about the sending process of the detection packet, refer to FIG. 3, the routing device 10 sends the multicast packet through the second multicast channel, and sends the OAM packet through the second multicast channel according to the set period. The value of the multicast packet sent by the OAM packet is as follows: As shown in Figure 3, OAM packet 1 carries Txl, OAM packet 2 carries Tx2, and Txl indicates the group counted when OAM packet 1 is sent. The number of broadcast packets sent, and Tx2 indicates the number of multicast packets sent when the packet 2 is sent. Step 220: The second multicast device receives the detection packet, and extracts the count value in the detection packet, and calculates a packet loss rate of the multicast channel to be detected according to the count value of the packet received from the multicast channel to be detected.

If the detection point is set on the second multicast device, the second multicast device receives the detection packet, and extracts the count value in the detection packet, and calculates the count value of the packet received from the multicast channel to be detected. Wait The packet loss rate of the detected multicast channel.

For the specific process, as shown in FIG. 3, the routing device 20 receives the OAM packet 1 and identifies the Tx1 in the OAM packet 1 and the multicast packet received by the routing device 20 when receiving the OAM packet 1. The count value of the text is Rxl. After receiving the OAM packet 2, the Tx2 in the OAM packet 2 is extracted, and the count value of the multicast packet received by the routing device 20 when receiving the packet 2 is Rx2.

The routing device 20 calculates the packet loss rate of the second multicast channel according to the formula: packet loss = (Rx2 - Rxl) - (Tx2 - Txl), thereby calculating the packet loss rate of the second multicast channel.

The specific process of identifying the detection packet may be determined by the routing device 20 according to the UDP port number in the detection packet, and if it is the set dedicated UDP port number, it is a detection packet; or may be based on the detection packet. The payload is judged, for example, whether the set position is inserted with a number or the like, or according to whether or not there is a set identification information in the payload.

The second multicast device may also detect the connectivity of the multicast channel to be detected according to whether the detection packet is received at a set time. For example, the second multicast device does not receive the detection packet within 3.5 cycles. The multicast channel to be detected is considered to be faulty.

The performance detection method of the multicast channel provided in this embodiment can be applied to the Layer 2 network and the Layer 3 network, and can detect the packet loss rate and connectivity of any segment on the multicast path, because the detection packet and the multicast channel are detected. The destination address information is consistent, so that the performance of a specific multicast channel can be detected. Embodiment 2

This embodiment provides a performance detection method for a multicast channel. The performance detection method can detect the performance of the delay or jitter of the multicast channel between the first multicast device and the second multicast device, for example, As shown in Figure 5, the method provided includes the steps of:

Step 500: The first multicast device constructs a detection packet, and the detection packet carries the time information of the first multicast device to send the detection packet, and sends the detection packet according to the destination address information of the detection packet.

The multicast path between the first multicast device and the second multicast device has at least two logical multicast channels, and each multicast channel is used to transmit multicast packets of different destination addresses, if the first multicast The multicast stream between the device and the second multicast device can be forwarded by the Layer 2 network. The destination address of the multicast packet transmitted by each multicast channel can be identified by the combination of the MAC address and the VLAN ID. The multicast stream between the multicast device and the second multicast device needs to be forwarded by the Layer 3 network. The destination address of the multicast packets transmitted by each multicast channel can be identified by a combination of IP and VLAN ID. The destination address information of the detection packet constructed by the first multicast device is the same as the destination address information of the multicast packet transmitted by the multicast channel to be detected, so that the specified multicast channel can be detected.

The first multicast device may carry the time information in the payload of the detection packet. For example, the configuration detection packet may be a management packet or other non-multicast protocol packet, and the management packet may be an OAM packet. For OMCI messages or other management messages, time information can be carried in the payload of the management message.

The payload of the UDP packet is the payload of the packet, and the packet is an OAM packet. The encapsulated UDP packet can be as shown in Figure 4.

To enable the receiving end to identify the detection packet, you can add a dedicated UDP port number to the detection packet. This can be distinguished from the normal multicast packet. The receiving end identifies the detection packet based on the UDP port in the detection packet. The affiliation identifier may also be added to the payload of the detection packet, and the receiving end identifies the detection packet according to the agreed identifier.

The first multicast device forwards the detection packet according to the destination address information of the detection packet, and the device that sets the detection point on the multicast path receives the detection packet. Step 510: The second multicast device receives the detection packet, and calculates the delay or jitter of the multicast channel to be detected according to the time information of the local detection packet.

If the detection point is set on the second multicast device, the second multicast device receives the detection packet, extracts the time information in the detection packet, and calculates the delay or jitter of the multicast channel to be detected according to the local time information. .

The second multicast device needs to identify the detection packet, and may determine whether the UDP port number in the packet is an agreed-only dedicated UDP port number. If yes, it is a detection packet; the second multicast device may also determine the packet. Whether there is an agreed identifier in the payload, and if so, it is determined to be a test message.

The second multicast device extracts the time information in the detection packet. If it is TxTimeStamp, the second multicast device further obtains the time information of the locally received detection packet, if it is RxTimeStamp.

Then the second multicast device follows the formula:

Delay = RxTimeStamp-TxTimeStamp calculates the delay of the multicast channel to be detected.

The performance detection method of the multicast channel provided in this embodiment can be applied to the Layer 2 network and the Layer 3 network, and can detect the delay and jitter of any segment on the multicast path, because the detection packet and the multicast channel are detected. The destination address information is consistent, so that the performance of a specific multicast channel can be detected. Embodiment 3

Correspondingly, the embodiment further provides a multicast device. As shown in FIG. 6, the multicast device 60 (which may be, but not limited to, the routing device 10, the routing device 20, or the access device 30 in FIG. 1) includes The multicast path interface 66 is used to connect to the second multicast device, and the multicast path interface 66 can be a three-mode adaptive interface. The three-mode includes GPON (Gigabit-capable Passive Optical Network). , EPON (Ethernet Passive Optical Network) and GE (Gigabit Ethernet, Gigabit Ethernet).

The multicast path interface 66 and the second multicast device have at least two multicast channels on the multicast path. The at least two multicast channels may be logical channels on the multicast path, for example, multicast channel 1, group Broadcast channel 2, ..., multicast channel η, each multicast channel is used to transmit multicast messages of different destination addresses. Specifically, if the current multicast device 60 and the second multicast device form a Layer 2 network, the destination address of the multicast message transmitted by the multicast channel may be a combination of a MAC and a VLAN ID, if the current multicast The device 60 and the second multicast device form a Layer 3 network. The destination address of the multicast packet transmitted by the multicast channel can be identified by a combination of IP and VLAN ID.

If the performance of one of the multicast channels needs to be detected, the multicast channel is the multicast channel to be detected.

The processor 62 is configured to construct a detection packet, where the detection packet carries the count value of the packet sent by the current multicast device through the multicast channel to be detected, or carries the time information of sending the detection packet. In order to detect the performance of a specific multicast channel, the destination address information of the detected packet needs to be the same as the destination address of the multicast packet transmitted by the multicast channel to be detected. The packet may be an OAM packet, an OMCI packet, or other management packet. Of course, this embodiment does not limit the specific protocol for detecting the packet. The count value or time information can be carried in the payload of the test message.

In another embodiment, the processor 62 may encapsulate the detection file by using the UDP protocol. To enable the receiving end to easily identify the detection packet, the processor 62 may also carry a dedicated UDP port number in the UDP packet. The UDP port number can be transmitted with the multicast channel to be detected. The UDP port number of the multicast stream is different. The receiving end can identify the detection packet according to the port number. Of course, the processor 62 can also set an agreed identifier in the payload, and the receiving end can identify the detected message according to the identifier in the payload.

The data transmitter 64 is configured to send the detection packet from the multicast path interface according to the destination address information of the detection packet.

The multicast device 60 provided in this embodiment may further include a memory 68, a power source, a power interface, and the like. The memory 68 is configured to store a count value or time information of a packet sent by the multicast channel to be detected.

The power supply is used to provide power to the multicast device 60, and the power interface can provide alternating current or direct current to the power supply.

The multicast device provided in this embodiment can be adapted to the Layer 2 network and the Layer 3 network, and can detect the packet loss rate and the connectivity of any segment on the multicast path. Therefore, the performance of the specific multicast channel can be detected. By using the multicast device provided in this embodiment, the fault of the specific multicast channel can be quickly located. The present embodiment further provides a multicast device. As shown in FIG. 7, the multicast device 70 (which may be, but is not limited to, the routing device 10, the routing device 20, or the access device 30 in FIG. 1) includes:

The data receiver 72 is configured to receive a packet, and the packet may be a multicast packet or a detection packet.

The processor 74 is configured to: when it is determined that the packet received by the data receiver 72 is a detection packet, extract the count value in the detection packet, and calculate the to-be-detected by using the count value of the packet received from the corresponding multicast channel. When the packet loss rate of the multicast channel is received, the time information in the detection packet is extracted, and the time information of the detection packet is calculated by using the time information of the local detection packet. shake.

Specifically, the processor 74 may include a framing module 741 and a CPU (Central Processing Unit) 743:

The framing module 741 is configured to identify the received message, and when the detected message is a detection message, extract the count value in the detection message or extract the time information in the detection message.

The framing module 741 can also extract the destination address information of the detected message, and identify which multicast channel is based on the destination address information. The specific process of identifying the detection packet may be that the framing module 741 identifies the detection packet or the ordinary multicast packet according to the identification information in the detection packet, and specifically determines whether the UDP port number in the packet is set. The specified private UDP port number, or whether to determine whether there is an agreed identifier in the payload of the message.

The framing module 741 can identify which multicast channel is sent according to the destination address information of the detection packet, and specifically obtain the multicast corresponding to the destination address information from the correspondence between the destination address information and the multicast channel identifier. The identification information of the multicast channel in this embodiment may be a label of the multicast channel, such as an ID, a channel number, or other information that can identify the multicast channel.

The framing module 741 is also used to count the messages received by each multicast channel and store the count values in the memory 76.

The CPU 743 is configured to calculate, according to the count value in the detection packet, the packet loss rate of the multicast channel to be detected, or the time information in the detection packet according to the count value of the packet received by the multicast channel to be detected. And calculating the delay and jitter of the multicast channel to be detected from the time when the detection packet is received by the multicast channel to be detected. The specific calculation process has been described in the foregoing embodiments and will not be described here.

The CPU 743 is further configured to not receive the detection packet within the set time, and determine that there is a fault in the multicast channel to be detected.

The multicast device 70 may further include a data transmitter 78 and the like, and the data transmitter 78 is configured to forward the message received by the data receiver 72.

By way of example, the multicast device provided in this embodiment may be a DSLAM (Digital Subscriber Line Access Multiplexer), an OLT (Optical Line Terminal), and an MSAN (Multiservice Access Node). Access node) or router.

The multicast device provided in this embodiment can detect the performance of the specific multicast channel. By using the multicast device provided in this embodiment, the fault of the specific multicast channel can be quickly located. A person of ordinary skill in the art may understand that all or part of the steps of the foregoing embodiments may be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, Read-Only Memory (ROM), Random Access Memory (RAM), disk or optical disk. The data processing method, device and system provided by the embodiments of the present invention are described in detail above. The present invention is not limited to the scope of the present invention.

Claims

Claim

A performance detection system for a multicast channel, comprising a first multicast device and a second multicast device, wherein the multicast path between the first multicast device and the second multicast device There are at least two multicast channels on the at least two channels, and the at least two channels are used to transmit multicast packets, and the multicast addresses transmitted by each multicast channel are different.

The first multicast device is configured to construct a detection packet, where the detection packet carries the multicast sent by the first multicast device through one of the at least two multicast channels to be detected. And the time value of the first multicast device to send the detection packet; the destination address information of the detection packet and the group transmitted by the multicast channel to be detected. The destination address information of the broadcast packet is the same; the detection packet is sent according to the destination address information of the detection packet;

The second multicast device is configured to receive the detection packet, and when the detection packet carries a count value, extract a count value in the detection packet, according to the extracted count value and the slave Determining, by the count value of the multicast packet received by the multicast channel, the packet loss rate of the multicast channel to be detected; or extracting the detection packet when the time information is carried in the detection packet The time information of the multicast channel to be detected is calculated according to the extracted time information and the time information of the locally received detection packet.

2. The system according to claim 1, wherein the destination address information is a combination of an Internet Protocol IP address and a virtual local area network identification VLAN ID, or a combination of a medium access control MAC address and a VLAN ID.

The system according to claim 1, wherein the detection message is an operation, management, and maintenance OAM message, and the first multicast device is further configured to use the user datagram protocol UDP to OAM packets are encapsulated.

The system according to any one of claims 1-3, wherein the detection message further carries a dedicated user datagram protocol UDP port information, and the second multicast device is further configured to detect and receive Whether the carried message carries the set dedicated UDP port information or the agreed identifier, and if so, determines that the received message is a detection message.

The system according to any one of claims 1 to 4, wherein the first multicast setting Prepare as a router or access device.

A method for detecting a performance of a multicast channel, where the multicast path between the first multicast device and the second multicast device has at least two multicast channels, and the at least two multicast channels For transmitting multicast packets, the destination address information of the multicast packets transmitted by each multicast channel is different. The method includes:

The first multicast device constructs a detection packet, where the detection packet carries the multicast packet sent by the first multicast device through one of the at least two multicast channels to be detected. a destination value, where the destination address information of the detection message is the same as the destination address information of the multicast message transmitted by the multicast channel to be detected;

The first multicast device sends the detection packet according to the destination address information, so that the second multicast device receives the detection packet, and extracts a count value in the detection packet, according to the Calculating a packet loss rate of the multicast channel to be detected, by using the extracted count value and the count value of the multicast packet received from the multicast channel to be detected;

Or

The first multicast device constructs a detection packet, where the detection packet carries time information of the first multicast device to send the detection packet, and the destination address information of the detection packet is to be detected. The destination address information of the multicast >3⁄4 text transmitted by the multicast channel is the same;

The method according to claim 6, wherein the destination address information is a combination of an Internet Protocol IP address and a virtual local area network identification VLAN ID, or a combination of a medium access control MAC address and a VLAN ID.

The method according to claim 6, wherein the detection packet further carries a dedicated user datagram protocol UDP port information, and the UDP port information is used to identify the detection packet.

A multicast device, comprising:

a multicast path interface, configured to connect to the second multicast device, the multicast path interface, and the second group There are at least two multicast channels on the multicast path between the broadcast devices. The at least two multicast channels are used to transmit multicast packets. The destination address information of multicast packets transmitted by each multicast channel is different. the same;

The processor is configured to construct a detection packet, where the detection packet carries a count value of the multicast packet sent by the current multicast device through one of the at least two multicast channels to be detected, or carries The current multicast device sends the time information of the detection packet; the destination address information of the detection packet is the same as the destination address information of the multicast packet transmitted by the multicast channel to be detected;

The multicast device according to claim 9, wherein the detection packet is an operation, management, and maintenance OAM packet, and the processor is further configured to encapsulate the OAM packet into a user datagram. Protocol UDP packet.

The multicast device according to claim 8, wherein the multicast device is a digital subscriber line access multiplexer DSLAM, an optical line terminal OLT, a multi-service access node MSAN or a router.