This article help you to configure the multicasting in a L2 network topology
Topology: IXIA << (ge-0/0/2) EX4300 -48P1 <<ge-0/0/1>> EX4300-48P2 (ge-0/0/2) >> IXIA
set interfaces ge-0/0/1 description EX4300-48P2
set interfaces ge-0/0/1 unit 0 family ethernet-switching interface-mode trunk
set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members all
set interfaces ge-0/0/1 unit 0 family ethernet-switching storm-control default
set interfaces ge-0/0/2 unit 0 family ethernet-switching interface-mode trunk
set interfaces ge-0/0/2 unit 0 family ethernet-switching vlan members all
set interfaces irb unit 26 family inet address 10.10.10.1/24
set protocols igmp-snooping vlan KRAMER interface ge-0/0/2.0
set vlans KRAMER vlan-id 26
set vlans KRAMER l3-interface irb.26
set interfaces ge-0/0/1 description EX4300-48P1
set interfaces ge-0/0/2 unit 0 family ethernet-switching vlan members KRAMER
set protocols igmp-snooping vlan KRAMER l2-querier source-address 10.10.10.1
set protocols igmp-snooping vlan KRAMER interface ge-0/0/1.0 multicast-router-interface