Purpose of Mapping agent in multicast

From: premkumar somasundaram (premkumar.somasundaram@gmail.com)
Date: Wed Apr 11 2007 - 12:26:13 ART


Could any one tell me the purpose of mapping agent. The doc says that it
uses 224.0.0.40 to advertise the RP information to other routers. But we
have a candiadate RP announces it self as a RP with 224.0.0.39. Both of
these groups are seen in multicast routing table of all the routers. Does
this mean we have redundant information of RP?? Is my understanding
correct??

Thanks
Prem



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