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Multicast forwarding route query method, intermediate node and management node

A technology for forwarding paths and managing nodes, which is used in data exchange details, devices for branch offices to provide special services, digital transmission systems, etc.

Active Publication Date: 2012-08-15
BEIJING ZHIGU TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] During the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the failure rate of the query scheme is high, and if there is a multicast forwarding path If the router fails, the first hop router will not be able to receive the request message, and will not be able to reply the response message, then the query will fail. The high failure rate will lead to low reliability of multicast forwarding path query.

Method used

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  • Multicast forwarding route query method, intermediate node and management node
  • Multicast forwarding route query method, intermediate node and management node
  • Multicast forwarding route query method, intermediate node and management node

Examples

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Embodiment 1

[0054] image 3 It is a flowchart of a method for querying a multicast forwarding path provided by Embodiment 1 of the present invention. The method of this embodiment specifically includes the following steps:

[0055] Step 301, the intermediate node receives the query message from the management node;

[0056] Step 302, the intermediate node forms a response message, sets the management address resolved from the management address field of the query message as the destination IP address of the response message, and sets the interface address of the machine receiving the query message in the response message. In the multicast source address field;

[0057] Step 303, the intermediate node sets the hop value in the hop number field of the response message according to the query message;

[0058] The hop value is used to indicate the hop number relationship between the intermediate node and the query starting point. If the query starting point is a management node, the hop val...

Embodiment 2

[0081] Figure 5It is a flow chart of the method for the management node to generate the query message in the method for querying the multicast forwarding path provided by Embodiment 2 of the present invention. This embodiment can be implemented based on Embodiment 1, and further includes when the path query command includes the specified router address. In this case, the steps for the management node to generate the query message include:

[0082] Step 401, generating a query message when the management node receives a path query command;

[0083] Step 402, the management node sets the multicast source address in the path query command in the multicast source address field of the query message;

[0084] Step 403, the management node queries the pre-stored RPF table according to the multicast source address to obtain the outgoing interface address of the local machine pointing to the multicast source, and sets the outgoing interface address of the local machine pointing to th...

Embodiment 3

[0098] The method for querying the multicast forwarding path provided by Embodiment 3 of the present invention can be based on Embodiment 1 or Embodiment 2 above, and further includes a method for querying the RPT path based on the PIM-SM protocol. In this embodiment, after the intermediate node forms the response message, it further includes: when the intermediate node judges that the first identification bit of the query message is the shared tree identification, setting the first identification bit of the response message as the shared tree identification. If it is judged that the first identification bit is a non-shared tree identification, then the first identification bit in the response message is set as a non-shared tree identification, in fact, the current response message is kept consistent with the first identification bit of the current query message .

[0099] Before the intermediate node receives the query message from the management node, it also includes the st...

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Abstract

The invention provides a multicast forwarding route query method, an intermediate node and a management node. In the method, the intermediate node receives a query message from the management node; a response message is formed, an administered address analyzed from a query message administered address field is set into an destination IP address of the response message, an interface address of thenative machine for receiving the query message is set in a multicast source address field of the response message; hop value in a response message hop count field is set according to the query message; the response message is transmitted to the management node, so as to be convenient for recording the multicast forwarding route information according to the response message by the management node;by adopting the technical scheme of the embodiment of the invention, the multicast forwarding route between the middle mode and the management node can be recorded hop by hop , so as to effectively improve the reliability of the route query and be convenient for a network administrator to know the multicast forwarding route information timely and accurately.

Description

technical field [0001] The embodiment of the present invention relates to a multicast network communication technology, in particular to a method for querying a multicast forwarding path, an intermediate node and a management node. Background technique [0002] Multicast technology is widely used in IP networks, and is mainly used in services such as video-on-demand and video conferencing. A protocol independent multicast (Protocol Independent Multicast, PIM for short) protocol is a relatively typical multicast protocol at present. According to different forwarding mechanisms, the PIM protocol can be further divided into two types: dense mode (Dense Mode, DM for short) and sparse mode (Sparse Mode, SM for short). [0003] The PIM-DM protocol mainly uses the Flooding-Prune mechanism to construct a shortest path tree (Shortest PathTree, SPT) between the multicast source node and the receiver node to forward the multicast stream, such as figure 1 Shown is an architecture diag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L12/18H04L29/12H04L45/74
Inventor 王秀文杨敬民
Owner BEIJING ZHIGU TECH SERVICE
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