multicast & lsi interface

I'm having trouble following a multicast stream once the "show multicast route instance XXX group xxx.xxx.xxx.xxx" shows a lsi interface as the upstream interface. Pleas help me understand how to continue to trace the multicast tree/stream once the lsi interface is seen in the output. Below is the out put of my show command.

Thanks in advance for help on this!!!

sturner@111-P1-CNR03-RE0> show multicast route instance BOVESPA-csp group 233.252.9.89

Instance: BOVESPA-csp Family: INET

Group: 233.252.9.89/32
      Source: *
      Upstream interface: lsi.1
     Downstream interface list:
               et-0/2/1.53

Group: 233.252.9.89
        Source: 177.54.210.57/32
        Upstream interface: lsi.1
        Downstream interface list:
                  et-0/2/1.53

{master}
sturner@111-P1-CNR03-RE0>