Scoping Issues on PIM (4)

Precise description of proposed restrictions
Restriction for Register messages
The source and destination addresses of an encapsulated multicast packet in a PIM Register message must not have a smaller scope than the respective scopes of the source and destination addresses of the Register message.
Restrictions for Bootstrap messages
When a router forwards a Bootstrap message, it should check the scope of the BSR address and should not forward the message on a link that breaks the zone boundary of the scope.
A multicast address contained in the message should be removed when the message is forwarded on an interface that belongs to a different scope zone from the zone of an incoming interface.
If an RP address for a multicast address contained in the message has a larger scope than the scope of the multicast address, the RP should be ignored and should not be contained in a forwarded message.
Restrictions for Candidate-RP-Advertisement messages
The unicast RP address stored in a Candidate-RP-Advertisement message should not have a smaller scope than thefrespective scopes of the source and destination addresses of the message.
Also, no multicast address associated with the RP should have a smaller scope than the scope of the RP address.