difference between ip pim join-group and ip pim static-group

ip igmp join-group 239.1.1.1 – Router actually becomes client ‘joins group’ and responds to ping to 239.1.1.1

ip igmp static-group 239.2.2.2 – router adds mroute for group but does not ‘join group’ and does not respond to 239.2.2.2

R6(config-if)#do sh run int f0/0
interface FastEthernet0/0
ip address 1.1.1.1 255.255.255.0
ip pim sparse-mode
ip igmp join-group 239.1.1.1
ip igmp static-group 239.2.2.2

See the L flag on the 239.1.1.1 group showing it is LOCAL and joined to the group on the router:

R6(config-if)#do sh ip mroute
IP Multicast Routing Table
Flags: D – Dense, S – Sparse, B – Bidir Group, s – SSM Group, C – Connected,
L – Local, P – Pruned, R – RP-bit set, F – Register flag,
T – SPT-bit set, J – Join SPT, M – MSDP created entry,
X – Proxy Join Timer Running, A – Candidate for MSDP Advertisement,
U – URD, I – Received Source Specific Host Report,
Z – Multicast Tunnel, z – MDT-data group sender,
Y – Joined MDT-data group, y – Sending to MDT-data group
Outgoing interface flags: H – Hardware switched, A – Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.1.1.1), 00:02:44/00:02:56, RP 0.0.0.0, flags: SJCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:02:44/00:02:56

(*, 239.2.2.2), 00:02:44/00:00:17, RP 0.0.0.0, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse, 00:02:44/00:00:17

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