When we enable a network in BGP process
network a.b.c.d mask 255.255.255.0 nlri unicast multicast
For normal unicast : it will advertize a subnet a.b.c.d / 24 to it's peer but what's the deal with multicast?
It seems me like "When there is a user who wants to receive a stream of any particular multicast IP address ( Mult_Addr_1) who is connected to the LAN which this router is advertizing in our case a.b.c.d/24 - BGP will inform it's peers that it needs a stream of Mult_Addr_1. A kind or way informing that it has a route to Mult_Addr_1."
When we peer with BGP only for multicast as follows:
neighbor p.q.r.s remote-as xyz nlri multicast
What actually takes place how does it helps or enables Multicast routing or forwarding for multicast packets? ( or does it helps PIM )
Please share the experience.
Thanks in advance