Sparse-dense-mode layer 2

[James Simpson]

HI All,

Whe configuring Multicast at layer 2 with a few switches and main switch with the SVI on.

Is ip pim sparse-dense-mode the only viable option ?

[Giuseppe Larosa]

Hello James,

if you have configured a Rendezvous point RP for all possible multicast addresses you can use

ip pim sparse-mode

if you have

int loop0

ip address 10.1.1.1 255.255.255.255

ip pim sparse-mode

ip pim rp 10.1.1.1

int vlan 100

ip pim sparse-mode

in this case you can use  directly IP PIM sparse mode only this is more efficient

L2 switches need to have IGMP snooping enabled for the Vlan in order to optimize multicast traffic replication in layer 2 topology the SVI with PIM enabled provides the IGMP querier and you don't need to configure it on the L2 switches.

Hope to help

Giuseppe