WO2008071032A1 - An ip multicast route monitoring system and the method thereof - Google Patents

Abstract

An IP multicast route monitoring system includes: a multi-service transport apparatus (202) located in the multi-service transport platform (MSTP) network side, for monitoring and transferring IP multicast route protocol PIM-SM messages; and at least one IP multicast router (204) connected with the multi-service transport platform network, for routing the IP multicast route protocol PIM-SM messages. Through the invention, MSTP network can perform IP multicast route control between many multicast routers.

Description

 TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to an IP multicast route monitoring system and method. Background of the Invention Multi-Service Transport Platform (MSTP) based on SDH (Synchronous Digital Hierarchy) has been widely used in the field of telecommunications.

MSTP is a hotspot in the field of optical communication in recent years. The SDH industry standard "YD/T 1238-2002 SDH-based multi-service transmission node technical requirements" is formulated, which discloses SDH function based on SDH multi-service transmission node, Ethernet service transparent transmission function, and Ethernet Layer 2 switching function. The requirements for mapping the Ethernet interface to the SDH virtual container and the technical requirements of the Ethernet ring network function. In recent years, the rapidly growing Internet service has driven the demand for multicast services, and multicast technology has been widely used in data networks, such as broadcast television. From the network level of the multicast service, the MSTP network generally uses the IGMP SNOOPING technology to control the IP multicast domain between the user terminal equipment access layer and the multicast router aggregation layer. As shown in Figure 1, this service involves only one multicast service sender and multiple multicast service receivers. For example, the VOD multicast server (VOD Server) in Figure 1 will use the video stream (Video Stream) multicast service. It is sent to the multicast router (Multicast group member) and then forwarded to the multicast group member (Multicast group member) through the MSTP network. The non-multicast group member cannot be connected to the multicast group. Video stream. However, with the rise of IPTV services, especially the joining of some new overseas operators, new requirements are imposed on the control of IP multicast routing between multiple multicast routers on MSTP networks. Although the multicast technology has been determined by MSTP as a technical requirement, the MSTP related industry standards do not give an implementation method. It can be seen that an IP multicast route monitoring system and method are needed to solve the problem that the current MSTP network cannot provide IP multicast routing control between multiple multicast routers. SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an IP multicast route monitoring system and method for solving the problem that an MSTP network cannot provide IP multicast routing control between multiple multicast routers. According to an aspect of the present invention, an IP multicast route listening system is proposed. The system includes: a multi-service transmitting device, located on the network side of the multi-service transmitting node, configured to listen and forward the IP multicast routing protocol PIM-SM message; and at least one IP multicast router, and the multi-service transmitting node The network is connected to route the IP multicast routing protocol PIM-SM 4. In the above IP multicast route monitoring system, the multi-service transmission device includes: an update unit, configured to update the multicast router neighbor connection relationship table when receiving the PIM-SM protocol HELLO message; receiving the PIM- In the case of the SM protocol JOIN/PRUNE 4, the IP multicast forwarding table is updated, and the updated IP multicast forwarding table updates the Layer 2 multicast address table in real time; and the message forwarding unit is used for switching at the Layer 2 The PIM-SM protocol HELLO packet is forwarded in the VLAN domain, and the IP address of the next hop multicast router in the JOIN/PRUNE packet of the PIM-SM protocol is extracted and found in the multicast router neighbor relationship table. The IP address of the multicast router matching the IP address of the mega-multicast router. If found, the PIM-SM protocol; OIN/PRUNE 4 is forwarded to the multicast router.

The neighboring port of the multicast router corresponding to the IP address. If not found, the #2 layer multicast forwarding table forwards the PIM-SM protocol JOIN/PRUNE packet in the Layer 2 switching VLAN. In the above IP multicast route monitoring system, the multicast router neighbor connection relationship table includes at least one of the following information: a multicast router IP address, a multicast router neighbor port number, and a VLAN ID of the multicast router Layer 2 switching domain. In the above IP multicast route monitoring system, the IP multicast forwarding table includes at least one of the following information: an IP multicast address, a VLAN ID of a Layer 2 switching domain to which the IP multicast address belongs, a JOIN/PRUNE 4 source port list, And each port retention time. In the above IP multicast route monitoring system, the Layer 2 multicast address table includes at least one of the following information: a Layer 2 multicast address, a VLAN ID, and a port list. In the above IP multicast route monitoring system, the multi-service transmission node is an SDH-based multi-service transmission node. According to another aspect of the present invention, an IP multicast route listening method is provided. In the method, the multi-service transmission node network is located between multiple multicast routers, and the method includes the following steps: S302: The multi-service transmission node network monitors the IP multicast routing protocol PIM-SM packet, and updates the multicast. a router neighbor connection relationship table, an IP multicast forwarding table, and a Layer 2 multicast address table; and S304, the multi-service transmission node network forwards the multicast service packet according to the Layer 2 multicast address table. In the above IP multicast route monitoring method, step S302 includes: when receiving the PIM-SM protocol HELLO 4 message, the multi-service transmitting node network updates the multicast router neighbor connection relationship table; and receives the PIM-SM In the case of the protocol JOIN/PRUNE, the IP multicast forwarding table is updated, and the Layer 2 multicast address table is updated in real time according to the updated IP multicast forwarding table. In the above IP multicast route monitoring method, when the PIM-SM protocol packet is a HELLO packet, the multi-service transport node network forwards the PIM-SM protocol HELLO packet in the Layer 2 switched VLAN domain; ^ = In the case of JOIN/PRUNE 4, the multi-service transport node network extracts the IP address of the next-hop multicast router in the PIM-SM protocol JOIN/PRUNE, and the multicast router neighbor connection relationship table Find the IP address of the multicast router that matches the IP address of the next-hop multicast router. If it finds, forward the PIM-SM protocol JOIN/PRUNE packet to the multicast router neighbor port corresponding to the IP address of the multicast router. If not found, the PIM-SM protocol JOIN/PRUNE packet is forwarded in the Layer 2 switched VLAN according to the Layer 2 multicast forwarding table. In the above IP multicast route monitoring method, the multicast router neighbor connection relationship table includes at least one of the following information: a multicast router IP address, a multicast router adjacency port number, and a multicast router layer 2 exchange i or a VLAN ID. In the above IP multicast route monitoring method, the IP multicast forwarding table includes at least one of the following information: an IP multicast address, a VLAN ID of a Layer 2 switched domain to which the IP multicast address belongs, a JOIN/PRUNE 4 source port list, And each port retention time. In the above IP multicast route monitoring method, the Layer 2 multicast address table includes at least one of the following information: a Layer 2 multicast address, a VLAN ID, and a port list. In the above IP multicast route interception method, the multi-service transport node is an SDH-based multi-service transport node. Through the invention, the MSTP network can perform IP multicast routing control between multiple multicast routers. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawing: 1 is a schematic diagram of a network between a multicast router and a user equipment of an MSTP network; FIG. 2 is a block diagram of an IP multicast route monitoring system according to the present invention; and FIG. 3 is a flowchart of an IP multicast route monitoring method according to the present invention. Figure 4 is a flow chart of a technical solution for listening to IP multicast routing in an MSTP network; and Figure 5 is a network diagram of an MSTP network between multiple multicast routers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to Figure 2, an IP multicast route listening system in accordance with the present invention is illustrated. As shown in the figure, the IP multicast route monitoring system includes: a multi-service transmitting device 202, located on the network side of the multi-service transmitting node, configured to listen and forward the IP multicast routing protocol PIM-SM message; and at least one IP group The broadcast router 204 is connected to the multi-service transport node network for routing the IP multicast routing protocol PIM-SM 4. The multi-service transmitting device 202 includes: an updating unit 2022, configured to update the multicast router neighbor connection relationship table when receiving the PIM-SM protocol HELLO message; and receive the PIM-SM protocol JOIN/PRUNE 4艮In the case of the text, the IP multicast forwarding table is updated, and the Layer 2 multicast address table is updated in real time according to the updated IP multicast forwarding table; and the 4 艮 forwarding unit 2024 is configured to forward the PIM in the Layer 2 switched VLAN domain. The SM protocol HELLO is used to extract the IP address of the next hop multicast router in the JOIN/PRUNE of the PIM-SM protocol, and finds the IP address of the next hop multicast router in the multicast router neighbor relationship table. If the IP address of the multicast router matching the address is found, the PIM-SM protocol JOIN/PRUNE packet is forwarded to the multicast router neighboring port corresponding to the IP address of the multicast router. If not found, the Layer 2 multicast is obtained. The forwarding table forwards the PIM-SM protocol JOIN/PRUNE 4 in the Layer 2 switched VLAN. The multicast router neighbor connection relationship table includes at least one of the following information: a multicast router IP address, a multicast router neighbor port number, and a VLAN ID of the multicast router Layer 2 switching domain. The IP multicast forwarding table includes at least one of the following: an IP multicast address, a VLAN ID of a Layer 2 switched domain to which the IP multicast address belongs, a list of JOIN/PRUNE packet source ports, and a port hold time. The Layer 2 multicast address table includes at least one of the following information: a Layer 2 multicast address, a VLAN ID, and a port list. The multi-service transport node is an SDH-based multi-service transport node. Referring to Figure 3, an IP multicast route snooping method in accordance with the present invention will be described. In this method, a multi-service transport node network is located between multiple multicast routers. As shown in the figure, the IP multicast route monitoring method includes the following steps: S302: The multi-service transmitting node network monitors the IP multicast routing protocol PIM-SM packet, and updates the multicast router neighbor connection relationship table and IP multicast forwarding. And a Layer 2 multicast address table; and S304, the multi-service transport node network forwards the multicast service packet according to the Layer 2 multicast address table. Step S302 includes: in the case that the PIM-SM protocol HELLO is received, the multi-service transmitting node network updates the multicast router neighbor connection relationship table; and the PIM-SM protocol JOIN/PRUNE message is received. Next, the IP multicast forwarding table is updated, and the Layer 2 multicast address table is updated in real time according to the updated IP multicast forwarding table. In the case that the PIM-SM protocol is HELLO 4艮, the multi-service transport node network forwards the PIM-SM protocol HELLO 4艮 in the Layer 2 switched VLAN domain; in the PIM-SM protocol, the message is JOIN. In the case of a /PRUNE packet, the multi-service transport node network extracts the IP address of the next-hop multicast router in the PIM-SM protocol JOIN/PRUNE packet, and searches for the next hop group in the multicast router neighbor connection relationship table. If the IP address of the multicast router matches the IP address of the multicast router, if it is found, the PIM-SM protocol JOIN/PRUNE packet is forwarded to the multicast router neighboring port corresponding to the multicast router IP address. If not found, the Layer 2 The multicast forwarding table forwards the PIM-SM protocol JOIN/PRUNE packets in the Layer 2 switching VLAN. The multicast router neighbor connection relationship table includes at least one of the following information: a multicast router IP address, a multicast router neighbor port number, and a VLAN ID of the multicast router Layer 2 switching domain. The IP multicast forwarding table includes at least one of the following: an IP multicast address, a VLAN ID of a Layer 2 switched domain to which the IP multicast address belongs, a list of JOIN/PRUNE packet source ports, and a port hold time. The Layer 2 multicast address table includes at least one of the following information: a Layer 2 group address, a VLAN ID, and a port list. The multi-service transport node is an SDH-based multi-service transport node. Specifically, a specific embodiment of the IP multicast route interception method will be described with reference to FIGS. 4 and 5. 4 is a flow chart of a technical solution for listening to IP multicast routing in an MSTP network. As shown in FIG. 4, the monitoring process includes the following steps: S402: The MSTP device port receives the PIM-SM protocol message; S404, determines whether the MSTP device port receives the PIM-SM protocol HELL® message; S406, if not After receiving the PIM-SM protocol HELLO packet, it determines whether the MSTP device port receives the PIM-SM protocol JOIN/PRUNE message; S408-S410, if the PIM-SM protocol JOIN/PRUNE 4 message is not received, the MSTP device The Layer 2 multicast address table is updated in real time according to the IP multicast forwarding table. The table entry includes at least a Layer 2 multicast address, a VLAN ID, and a port list, and the MSTP device is based on Layer 2 of the Layer 2 multicast address table. The multicast address, the VLAN ID, and the port list are forwarded to the multicast service. S412-S414, when receiving the PIM-SM protocol HELLO message, update the multicast router neighbor connection relationship table, and The HELLO packet is forwarded in the layer switching VLAN domain; S416-S418, when the PIM-SM protocol JOIN/PRUNE 4 message is received, the IP group insertion forwarding table is updated, and the next hop multicast router in the packet is extracted. IP address, find multicast router neighbors If the matching table matches the IP address of the multicast router in the entry, the packet is forwarded to the neighboring port of the multicast router corresponding to the entry. If no match is found, the packet is exchanged at Layer 2. Forward within the VLAN domain. Figure 5 is a network diagram of an MSTP network between multiple multicast routers. As shown in FIG. 5, an embodiment in which the MR A is used as a service sender and the MR B 1 and the MR B2 are the receivers is used as an example, and the implementation scheme of the present invention for monitoring IP multicast routes in the MSTP network is illustrated. The specific implementation includes the following steps:

The MSTP device receives the PIM-SM protocol. After receiving the PIM-SM protocol, the MSTP device performs at least the following processing: When the MSTP network C receives the PIM-SM from ports A, Bl, and B2. When HELLO is in the text, the update multicast router neighbor connection relationship table is as shown in the following table (1): Table (1)

Multicast router IP multicast router neighbor Multicast router Layer 2 handover Multicast router adjacency relationship Address Port number Change domain VLAN ID Hold time

 IP— MR— A Port A VLAN X Time IP MR A

IP MR Bl Port Bl VLAN X Time IP MR B

IP—MR—B2 Port B2 VLAN X Time IP MR C If PortA, Bl, B2, and B3 belong to VLAN X, the received HELLO 4 message is forwarded to the multicast router connected to the port other than the source port. Optionally, when the MSTP device ports B1 and B2 receive the PIM-SM protocol JOIN/PRUNE 4, extract the IP multicast address in the message, and update the IP multicast forwarding table as shown in Table (2): (two)

 The next-hop multicast router address in the received JOIN/PRUNE message is IP-MR-A, and the multicast router neighbor connection relationship table is searched. The neighboring port of the multicast router corresponding to IP_MR-A is Port A. The received JOIN/PRUNE packet is forwarded to the multicast router MR A connected to Port A.

MSTP device> Updates the Layer 2 multicast address table in the service forwarding chip in real time according to the IP multicast forwarding table, as shown in Table (3): Table (3)

The service forwarding chip of the MSTP device forwards the multicast service packet according to the Layer 2 multicast address table. The VOD multicast server sends the video stream multicast service to the multicast router A, and then forwards it to the multicast routers B1 and B2 of the multicast group member through the MSTP network C. The multicast router B3 without the multicast group member cannot receive the multicast router B3. The multicast video stream. In the above steps, when the MSTP device port pair receives other PIM-SM protocols, as shown in Table (4), it is required to forward in the Layer 2 switched VLAN domain. In addition, it is also possible to perform the special processing of the PIM-SM protocol type message in Table 3 before forwarding. (Table 4)

 Description

 Login ( Register )

 Login termination (Register- Stop)

 Bootstrap

 Statement (Assert)

 Graft ( Used I PIM-DM only )

 Graft-Ack (Used I PIM-DM only) Alternative RP Announcement (Candidate-RP-Advertisement) In summary, the core idea of the present invention is to place the MSTP network in accordance with the framework of the MSTP network. Between the multicast routers, in the new network layer, through the monitoring of the IP multicast routing protocol PIM-SM 4, the establishment, modification, and deletion of the IP multicast domain by the MSTP network are completed, thereby implementing the entire IP. The multicast service is forwarded in the IP multicast domain. With the present invention, the MSTP network can perform IP multicast routing control between multiple multicast routers. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim An IP multicast route monitoring system, comprising:  a multi-service transmitting device, located on the network side of the multi-service transmitting node, for monitoring and forwarding the IP multicast routing protocol PIM-SM 4;  The at least one IP multicast router is connected to the multi-service transport node network, and configured to route the IP multicast routing protocol PIM-SM4. The IP multicast route monitoring system according to claim 1, wherein the multi-service transmission device comprises:  The update unit is configured to update the multicast router neighbor connection relationship table when the PIM-SM protocol HELLO 4 message is received, and update the IP multicast when the PIM-SM protocol JOIN/PRUNE is received Forwarding the table, and> updating the Layer 2 multicast address table in real time according to the updated IP multicast forwarding table; a packet forwarding unit, configured to forward a PIM-SM protocol HELLO message in a Layer 2 switched VLAN domain, and to extract a next hop multicast router IP address in the PIM-SM protocol JOIN/PRUNE message, and And searching, in the multicast router neighbor connection relationship table, a multicast router _IP address that matches the _IP address of the next hop multicast router, and if found, forwarding the PIM-SM protocol JOIN/PRUNE 4 The PIM-SM protocol JOIN/PRUNE is forwarded to the Layer 2 switched VLAN according to the Layer 2 multicast forwarding table if the multicast router neighboring port corresponding to the IP address of the multicast router is not found. Message. The IP multicast route monitoring system according to claim 2, wherein the multicast router neighbor connection relationship table includes at least one of the following information: a multicast router IP address, a multicast router adjacency port number, and VLAN ID of the Layer 2 switched domain of the multicast router. The IP multicast routing monitoring system according to claim 3, wherein the IP multicast forwarding table includes at least one of the following information: an IP multicast address, a VLAN of a Layer 2 switching domain to which the IP multicast address belongs ID, JOIN/PRUNE message source port list, and port hold time. The IP multicast route monitoring system according to claim 3, wherein the Layer 2 multicast address table includes at least one of the following information: a Layer 2 multicast address, a VLAN ID, and a port list. The IP multicast route monitoring system according to any one of claims 1 to 5, wherein the multi-service transmission node is an SDH-based multi-service transmission node. A method for monitoring an IP multicast route, characterized in that a network of a multi-service transport node is located between a plurality of multicast routers, and the method comprises the following steps:  S302. The multi-service transmitting node network monitors the IP multicast routing protocol PIM-SM packet, and updates the multicast router neighbor connection relationship table, the IP multicast forwarding table, and the second layer group. ■ii "address table; and  S304. The Layer 2 multicast address table that is updated by the multi-service transport node network forwards the multicast service packet. The IP multicast route monitoring method according to claim ,, wherein the step S302 includes:  In the case that the PIM-SM protocol HELLO message is received, the multi-service transmission node network updates the multicast router neighbor connection relationship table;  When the PIM-SM protocol JOIN/PRUNE is received, the IP multicast forwarding table is updated, and the Layer 2 multicast address table is updated in real time according to the updated IP multicast forwarding table. 9. The IP multicast route monitoring method according to claim 8, wherein:  In the case that the PIM-SM protocol is the HELLO 4, the multi-service transport node network forwards the PIM-SM protocol HELLO message in the Layer 2 switched VLAN domain; In the case that the PIM-SM protocol message is JOIN/PRUNE, the multi-service transmission node network extracts the IP address of the next-hop multicast router in the PIM-SM protocol JOIN/PRUNE. And searching, in the multicast router neighbor connection relationship table, the IP address of the multicast router that matches the IP address of the next hop multicast router, and if found, forwarding the PIM-SM protocol JOIN/PRUNE packet a neighboring port of the multicast router corresponding to the IP address of the multicast router, if not found, forwarding according to the Layer 2 multicast The PIM-SM protocol JOIN/PRUNE packet is forwarded in the Layer 2 switched VLAN. The IP multicast route monitoring method according to claim 9, wherein the multicast router neighbor connection relationship table includes at least one of the following information: a multicast router IP address, a multicast router adjacency port number, and VLAN ID of the Layer 2 switched domain of the multicast router.  The IP multicast routing monitoring method according to claim 9, wherein the IP multicast forwarding table includes at least one of the following information: an IP multicast address, and a VLAN of a Layer 2 switching domain to which the IP multicast address belongs. ID, JOIN/PRUNE message source port list, and port hold time. The IP multicast route monitoring method according to claim 9, wherein the Layer 2 multicast address table includes at least one of the following information: a Layer 2 multicast address, a VLAN ID, and a port list. The IP multicast route monitoring method according to any one of claims 7 to 12, wherein the multi-service transmission node is an SDH-based multi-service transmission node.