Is it good practice to enable pim in campus networks?

[carl_townshend]

---

Hi All

is it good practice to enable pim on campus l3 switches, this is to stop the flooding behaviour of multicast to all ports and to allow igmp snooping to work properly.

what do most people do?

cheers

[Giuseppe Larosa]

Hello Carl,

you should enable PIM if you want to provide multicast routing in your campus network.

However, I understand your concerns about IGMP snooping that would require an IGMP snooping querier in each user VLAN to work properly.

So enabling ip pim sparse-dense mode may be a way to skip the need to use an IGMP snooping querier with the advantage that for each VLAN the querier is elected by PIM and supports redundancy ( IGMP snooping querier should be configured on a single device per client VLAN no built in redundancy here ). To be noted the elected querier by PIM is the non DR device to load share the duties between devices.

Hope to help

Giuseppe