Understanding Multicast Forwarding on a Junos Fusion Enterprise
Starting with Junos OS Release 17.1R1, multicast traffic forwarding is supported in Junos Fusion Enterprise. Multicast forwarding is supported only on the aggregation device (AD).
Overview of Multicast Forwarding
The AD performs ingress multicast replication to a set of extended ports. On the satellite device, multicast traffic is received for each of the extended ports. The following scenarios are supported for both IPv4 and IPv6 traffic:
Layer 2 multicast with VLAN flooding—IGMP snooping and the Multicast Learner Discovery (MLD) protocol are configured on the AD to forward multicast traffic
Layer 3 multicast—IGMP and PIM are configured on the AD to forward multicast traffic. Only versions 2 and 3 of IGMP are supported.
Configuring Layer 2 Multicast Forwarding in a Junos Fusion Enterprise
To configure Layer 2 multicast forwarding in a Junos Fusion Enterprise, configure IGMP snooping and MLD snooping on each VLAN. The following example shows the basic configuration required. Virtual router instances with integrated routing and bridging (IRB) interfaces are also supported.
protocols {
igmp-snooping {
vlan team-a {
interface ge-101/0/0.0 {
multicast-router-interface;
}
interface ge-101/0/1.0 {
static {
group 233.252.0.1;
}
}
}
vlan team-b;
}
}
Configuring Layer 3 Multicast Forwarding in a Junos Fusion Enterprise
To configure Layer 3 multicast forwarding in a Junos Fusion Enterprise, enable PIM and IGMP. The following example shows the basic configuration required. Note that an IRB interface are also required as the multicast traffic is forwarded through IRB interfaces.
protocols {
igmp {
accounting;
interface all;
interface irb.40 {
version 2;
}
interface irb.50 {
static {
group 233.252.0.1;
}
}
}
pim {
rp {
auto-rp discovery;
static {
address 192.0.2.1;
}
}
interface all {
mode sparse;
}
}
}