multicast routing in Linux kernel supports MULTIPLE upstream VIFs?

["cyx_mail" <cyx_mail@xxxxxxxxxxx>]

Hi,all!
	Can multicast routing in Linux kernel support MULTIPLE upstream VIFs? Such as MULTIPLE 1-to-many relations:

									LINUX BOX
	---------------------------------------------------------                     		  
									 |----------- downstream_1:1
    	upstream_1 ---------|----------- downstream_1:2
									 |----------- downstream_1:3

    							 	 |----------- downstream_2:1
    	upstream_2 ---------|----------- downstream_2:2
									 |----------- downstream_2:3


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