I'm having a problem with one of our 6509s, the CPU on it constantly goes up to close to 100% for a minute and then drops back down to single digits (it happens every few minutes), it's not causing connectivity issues yet, but I'm worried that it eventually will. I can't really figure out what's going on, I'm pretty sure it's multicast traffic causing the problem though. I've attached a very basic diagram of our network.
Most of the multicast traffic would originate either from Core1 or Core2, although some multicast originates from either of the distribution switches or the access switches. All the interfaces and vlans are set up with sparse-dense mode and we're not using any RP's right now.
The switch that's having the cpu spikes is distribution 1...we're running EIGRP for routing.
Can anybody help me figure what's going on? Here is the output of show proc cpu when the cpu jumps up.
CPU utilization for five seconds: 95%/79%; one minute: 24%; five minutes: 27%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
86 3728919922187837326 0 14.58% 3.07% 4.77% 0 IP Input
170 109925716 998945240 110 0.57% 0.22% 0.23% 0 Port manager per
Thanks for any help!