Multicast Sparse mode

Hi Experts.

R1---R2---R3---R4----R5

Running sparse mode. R3 is RP(3.3.3.3), R1 is server(10.0.1.1), R5 is client (225.0.5.5).

Whenever I start pinging multicast group (225.0.5.5).

R2 is also having (*,G) entry in its Multicast routing table. Why?

R2#show ip mroute

(*, 225.0.5.5), 00:01:04/stopped, RP 3.3.3.3, flags: SP
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list: Null
(10.0.1.1, 225.0.5.5), 00:01:04/00:01:55, flags: T
  Incoming interface: Ethernet0/1, RPF nbr 10.0.1.1
  Outgoing interface list:
    Serial1/1, Forward/Sparse, 00:01:04/00:03:25
(*, 225.0.5.5), 06:58:43/00:02:53, RP 150.1.5.5, flags: SJPL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list: Null

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Received on Mon Mar 11 2013 - 08:15:14 ART