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Multicast Routing between vlans on layer 3 switches without a Router

Hi

I have a network with 5 access switches connected directly to a cisco 4500, also i have enabled intervlan routing globally so communication between different VLANS with different subnet is not an issue 

 

as im new to the subject just want to know how can i proceed with multicast routing between VLANs in my environment.

 

will enabling IGMP on all the switches be enough or do i have to do some other configurations

 

thnx

2 ACCEPTED SOLUTIONS

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Hall of Fame Guru

 

IGMP snooping should be enabled by default so nothing to do on access switches. 

 

On the core switch you need to - 

 

1) enable multicast routing "ip multicast-routing" 

 

2) on each of the L3 vlan interfaces enable PIM eg.  "ip pim dense-mode" or "ip pim sparse-mode". 

 

If you configure sparse mode you need an RP as well which would be your core switch in this case. 

 

Jon

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The PIM RP is only needed on other multicast routers, it's not used on L2 only devices.

I recall (?) it's a global parameter, not an interface parameter. You can have more than one, though, for different multicast address blocks.

View solution in original post

3 REPLIES 3
Highlighted
Hall of Fame Guru

 

IGMP snooping should be enabled by default so nothing to do on access switches. 

 

On the core switch you need to - 

 

1) enable multicast routing "ip multicast-routing" 

 

2) on each of the L3 vlan interfaces enable PIM eg.  "ip pim dense-mode" or "ip pim sparse-mode". 

 

If you configure sparse mode you need an RP as well which would be your core switch in this case. 

 

Jon

View solution in original post

Highlighted

thanks Jon

 

just want clarification regarding adding a RP

 

so in each VLAN interface i enable PIM sparse

 

ip pim sparse-mode

 

assume that my interfaces for core switch for VLAN 1 is 192.168.10.10

and vlan 2 is 10.10.10.5

 

 

do i have to assign the RP ip address in access level switches as well or only in the core under each VALN interface if i configure the RP ip address will it be enough

eg:- for vlan 2

 ip pim rp-address 10.10.10.5     

 

thanks

Highlighted

The PIM RP is only needed on other multicast routers, it's not used on L2 only devices.

I recall (?) it's a global parameter, not an interface parameter. You can have more than one, though, for different multicast address blocks.

View solution in original post

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