Re: Multicast routing

AbdulhadiRaoufzada · ‎08-05-2019

Hi, I want to configure multicast routing on cisco 3850 switch in different VLANs, and I tried every command that was necessary but I don't know why it is not working?

could you please help me what should I do?

paul driver · ‎08-05-2019

Hello
If the mc source and receivers are all l2 lan based then make sure igmp snooping is enabled to the vlan on all switches where the MC receivers located and igmp snooping querier on the core switch then this should provide MC to all you lan hosts.

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Paul

Giuseppe Larosa · ‎08-05-2019

Hello Abdullah,

for IPv4 multicast routing to work you need:

a) enabling ipv4 multicast routing in global config

ip multicast-routing

b) on each SVI L3 interface Vlan X you add

int Vlan X

ip pim sparse-dense mode

c) int loop0

ip address 10.1.1.1 255.255.255.255

ip pim sparse-dense mode

d)

in global config

ip pim rp 10.1.1.1

In all interfaces with PIM enabled IGMP version 2 is enabled automatically.

Hope to help

Giuseppe