Router for multicast redundant routing and system for multicast redundancy
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United States of America Patent
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Issued Date -
Mar 9, 2006
app pub date -
Jul 15, 2005
filing date -
Sep 6, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
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.
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