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Which PIM Variant to Require: II For source trees: PIM-SM could be used, but has problems in inter-provider scenarios: Use of RP is major network engineering hassle Two SPs wouldn’t want to share RP, as no way to manage the intra-SP part of the service Assignment of multicast group address virtually impossible: n-party coordination problem Years of experience with PIM-SM shows these to be very real practical difficulties in multicast deployment MSDP deals with some of these problems PIM-SSM was created to avoid these problems, and is the preferred way to produce source trees |