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Router for multicast redundant routing and method for multicast redundancy

A router and routing technology, applied in the direction of transmission system, digital transmission system, data exchange details, etc., can solve the problems of losing the lightness and simplicity of IGMP/MLD proxy, and the lack of multi-point transmission.

Inactive Publication Date: 2006-03-15
HITACHI COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the link to the upper-level router is blocked due to this, all multicast transmission to the lower-level network will fail.
If a routing protocol such as PIM is used, there may be multiple links to the upper router, but it loses the lightness and simplicity of IGMP / MLD proxy

Method used

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  • Router for multicast redundant routing and method for multicast redundancy
  • Router for multicast redundant routing and method for multicast redundancy
  • Router for multicast redundant routing and method for multicast redundancy

Examples

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Effect test

Embodiment 2

[0042] The network structure and the overall timing of the network are the same as those in Embodiment 1.

[0043] Figure 7 is a functional block diagram of the IGMP / MLD agent program of the present invention, is Image 6 A modification of the example of . The upper link communication unit has a replacement upper link information holding unit 11122 and an upper link routing information monitoring unit 11124 . The substitute upper layer link information holding unit 11122 holds link information to the substitute upper layer router. The upper-layer link routing monitoring unit 11124 monitors the link state information of the IP unicast routing protocols of OSPF and BGP operating on the line set as the upper-layer link, and uses it in the event of a failure. The link to the upper router is replaced instead of the information held in the upper link information holding unit. As a method for the upper link routing information monitoring unit 11124 to monitor IP unicast informat...

Embodiment 3

[0046] The network structure and the overall timing of the network are the same as those in Embodiment 1.

[0047] Figure 8 is a functional block diagram of the IGMP / MLD agent program of the present invention, is Image 6 A modification of the example of . The upper link communication unit has a replacement upper link information holding unit 11122 and an inquiry monitoring timer 11125 . The substitute upper layer link information holding unit 11122 holds link information to the substitute upper layer router. Inquiry monitoring timer 11125 counts the interval of inquiry messages from the line set as the upper layer link. After a certain period of time, if the inquiry message does not arrive, it is regarded as a failure and is used in the replacement of the upper layer information holding unit. The retained information is used to replace the link to the upper router.

[0048] Since the interval of the inquiry message is longer than the time spent in the link disconnection ...

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Abstract

In the IGMP / MLD Proxy, a link to an upper router must be formed in a tree structure. However, in this case, if a fault is generated in the link to the upper router, multicasts to the lower networks are all disabled. Plural links to the upper router may be set up using a routing protocol such as PIM, but light and easier operations of the IGMP / MLD Proxy are lost. In view of solving this problem, alternative links may be set in addition to the links which are usually used as the links to the upper router. Usually, the IGMP / MLD is exchanged only with the links which are usually used but with the alternative link. If link-off is detected in the link to the upper router used generally, the IGMP Membership Report / MLD Listener Report packet is transmitted to the side of the alternative link and thereafter the upper link is switched through exchanges of the IGMP / MLD only with the side of the alternative link.

Description

technical field [0001] The present invention relates to routing of IP multicast. Background technique [0002] Common IP packet transmission is basically one-to-one communication. Call it IP Unicast. On the other hand, as a technology for realizing broadcast services such as image distribution using a network, there is an IP multicast technology. It is a structure in which the IP message sent from the information delivery server is delivered to a plurality of hosts by branching from routers on the IP network. As a result, the information sending server does not need to repeatedly send the number of hosts, which reduces the load. In addition, since packets with the same content go through the same path several times, the burden on the network as a whole is also reduced. [0003] There are protocols such as PIM and DVMRP in multicast routing, and IGMP / MLD proxy can be set up most easily and with light operation. Its structure is as follows: The gateway of the LAN organize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/18H04L45/24
Inventor 吉本哲郎续木彰人
Owner HITACHI COMM TECH
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