SSM : Source Specific Multicast
=> Allow only certain sources to register with RP.
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Merge this with the allowing access only to Even Multicast Group via modifying this ACL
and you get following.
ip access-list extended SSM
deny ip host 10.23.1.1 229.0.0.1 0.0.0.254
permit ip any any
ip pim accept-register list SSM
This way 10.23.1.1 will not be able to register with RP for odd groups in 229.0.0.x multicast groups. Rest (even and anything else) is allowed
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