Method for implementing two-way protocol independent multicast (PIM) and equipment

An implementation method and equipment technology, applied in the communication field, can solve problems such as inability to multicast load sharing

Active Publication Date: 2012-11-07
XINHUASAN INFORMATION TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0013] Under the above-mentioned Bidir-PIM protocol mechanism, the multi

Method used

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  • Method for implementing two-way protocol independent multicast (PIM) and equipment
  • Method for implementing two-way protocol independent multicast (PIM) and equipment
  • Method for implementing two-way protocol independent multicast (PIM) and equipment

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Embodiment Construction

[0031] As mentioned above, under the Bidir-PIM protocol mechanism, the load sharing of equal-cost routes cannot be realized like PIM DM / SM. This is because: on a router, once the RP is elected, its corresponding RPF interface and a group of DF interfaces are determined (later, an RPF interface and a group of DF interfaces on the router will be called RPF_DF_TABLE). In the bidirectional PIM (*, G) entry, its RPF interface and DF interface both come from the RPF_DF_TABLE on the router. If the (*, G) entry under the same RP uses different RPF interfaces, its DF The interface list may also be different, and as a result, multiple principles in the above-mentioned Bidir-PIM protocol may be violated, resulting in loops or forwarding failures.

[0032] Here is an example to illustrate the problem:

[0033] exist figure 2 In the shown network, it is assumed that there are equal-cost routes S4->S2->S1->R1 and S4->S3->S1->R1 from S4 to RP, and the IP address of the interface S2.4 pointi...

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Abstract

The invention discloses a method for implementing two-way protocol independent multicast (PIM) and equipment. According to the method, an equivalent routing number for allowed load sharing is configured on each piece of routing equipment in a two-way PIM network; each piece of routing equipment generates corresponding quantity of designated forwarder (DF) election examples according to the equivalent routing number for allowed load sharing and elects a DF interface corresponding to each DF election example, wherein a reverse path forwarding (RPF) interface corresponding to each DF election example is selected from an equivalent routing interface set of the routing equipment by the routing equipment in a polling way; and when generating a multicast forwarding table entry, the routing equipment is matched to the corresponding DF election example according to a corresponding multicast group, acquires the RPF interface which corresponds to the matched DF election example, and generates a corresponding multicast forwarding table entry, wherein the RPF interface in an output interface list in the generated multicast forwarding table entry is the RPF interface which corresponds to the matched DF election example. By the method and the equipment, multicast load sharing can be realized by using equivalent routing.

Description

technical field [0001] The invention relates to multicast technology in the communication field, in particular to a bidirectional PIM multicast realization method and equipment thereof. Background technique [0002] As a communication method in parallel with Unicast and Broadcast, Multicast technology can effectively solve the problem of single-point transmission and multi-point reception, thus realizing efficient point-to-multipoint in the network. Data transmission can save a lot of network bandwidth and reduce network load. [0003] The mainstream multicast routing protocol PIM (Protocol Independent Multicast, Protocol Independent Multicast) is a protocol family. In this family, four protocols have been born: PIM DM (Protocol Independent Multicast - Dense Mode), PIM SM (Protocol Independent multicast—sparse mode), SSM (source-specified multicast) mode, Bidir-PIM (two-way PIM) mode, to adapt to different application environments. [0004] Bidir-PIM is suitable for the ap...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L45/16
Inventor 游君平王锋
Owner XINHUASAN INFORMATION TECH CO LTD
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