Multicasting Configuration on 3750x Switch

mohammad_omran · ‎01-29-2013

Dears

when enabling multicasting on layer 3 interfaces the CPU becomes fully utilized , is there any specific configuration should be enabled to reduce this .

Config :

Inetface vlan 100

ip pim sparse-dense

ip igmp version 3

Inetface vlan 101

ip pim sparse-dense

ip igmp version 3

Best Regards

mgalazka · ‎01-29-2013

When the cpu spikes, what process is using the majority of cpu time? i.e. show proc cpu sort | exc 0.00

Is the multicast traffic in question operating in dense or sparse mode? Do you have an RP defined?

I would also recommend reading through this blog post, as it is a very good guide to troubleshooting high CPU from multicast:

https://supportforums.cisco.com/community/netpro/network-infrastructure/switching/blog/2012/12/12/troubleshooting-high-cpu-due-to-multicast

Thanks,

Matt