Objectives
The simulator ticks each one as soon as the network meets it.
Enable pim ipv4 sparse-mode on every routed interface (and Loopback0 on R2).
Under router multicast → ipv4 configure routing.
Under router pim sparse-mode → ipv4 configure rp address 2.2.2.2.
Join 239.1.1.1 on PC3, then ping 239.1.1.1 from SRC: PC3 replies.
On R3, show ip mroute lists 239.1.1.1 with RP 2.2.2.2.
Before you start
EOS has no ip multicast-routing or dense mode; it runs PIM sparse mode (and bidirectional PIM). Enabling PIM on an interface also enables IGMP there, IGMPv3 by default.
Concept
PIM sparse mode (ASM): shared tree, register, SPT
Sparse mode sends a stream only where it is requested. Receivers’ routers join a shared tree rooted at a rendezvous point (RP); the source’s router registers the stream to the RP; once the stream arrives, the receiver’s router joins the source directly on the shortest-path tree (SPT).
Concept
IGMP: how a receiver asks for a group
A multicast group (224.0.0.0/4) is an address many receivers can listen to at once. A host tells its local router it wants a group with an IGMP membership report; the router then pulls the stream toward that LAN. IGMPv2 can only name the group; IGMPv3 can also name the source.
