How to broadcast a message in other networks in cisco packet tracer?

[shanoo]

I have a very simple network of 5 switches with many PCs connectd to it and a router. I can broadcast a message within a network but cannot do it in all the networks at one time. Can you guide me through the steps to do that?

[Flavio Miranda]

@shanoo 

Broadcast does not cross layer3 devices like a router.  As you have a router in the center of your topology, all broadcast will stop there.

[David Ruess]

Hello,

As you have a L3 device, and as @Flavio Miranda mentioned the broadcast stops at the router (or the L3 interface it reaches first). If you want to broadcast something across a L3 boundary you'd likely need to implement multicast. Not sure if packet tracer supports those functions but you could try. Make sure you implement it on the router and switches. And any PC that needs to hear the message would need to listen for the IP/MAC mapping of the multicast address you're brodcasting to.

Multicast is a complex and involved technology. It may not be feasible with what you're trying to accomplish either.

-David

[MHM Cisco World]

Apologies but ip helper can forward broadcast from one network to.other through L3 device.

But I think ip helper command nit support in PKT

MHM

[David Ruess]

Is it all broadcasts or only DHCP related broadcasts? Even so the OP would have to include an IP helper statement for every PC that needed to receive the broadcast.

[MHM Cisco World]

Is it all broadcasts or only DHCP related broadcasts? For all

Even so the OP would have to include an IP helper statement for every PC that needed to receive the broadcast. No need he can use limit broadcast to flood to all PC in one subnet' for example 10.0.0.0/24  we can config ip helper with 10.0.0.255

MHM