Some multicast infos

> Multicast is a class D address from 224-239
> Multicast address from 224.0.0.0 - 224.0.0.255 are for local network use (ttl=1) they can't pass through routers (think 224.0.0.9 rip, 224.0.0.10 eigrp, 224.0.0.5 ospf allrouter, 224.0.0.6 dr and bdr ospf router, 224.0.0.2/12 hsrp, 224.0.0.18 vrrp, etc)
> Range 239.0.0.0/8 is private multicast address
> Pim-dm (pim dense mode): for the small network
> Pim-sm (pim sparse mode): for the big network
> Some commands on ios: ip pim send-rp-announce, ip pim send-rp-discovery, ip pim dense-mode, ip pim sparse-mode, ip pim accept-rp auto-rp, and many others ..

Multicast is a great topic, but due to the fact that we don't encouter multicast in everyday network i will need more times to really master this topic.
I want to become a ccie, a true expert so i need to master not to know (theory, concepts, and config on cisco routers)
In my future post, i'm sure we gonna find some multicast, but know is enough for multicast today.