We have very high CPU on a 3750 stack switch stack we use as our core switch.
I used the documentation here to troubleshoot
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html#wp1034726
Our 'show cpu process' showed very high interupt values(~22%) and I got this from our debug logs:
Oct 17 21:50:58.909: ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan300 L2If:GigabitEthernet1/1/1 DI:0xB4, LT:7, Vlan:300 SrcGPN:49, SrcGID:49, ACLLogIdx:0x0, MacDA:5057.a82c.0146, MacSA: 7819.f74e.10a6 IP_SA:118.67.104.12 IP_DA:27.111.203.116 IP_Proto:6
TPFFD:EC000031_0000012C_00B00040-000000B4_02280000_A8E20000
Oct 17 21:50:58.909: ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan300 L2If:GigabitEthernet1/1/1 DI:0xB4, LT:7, Vlan:300 SrcGPN:49, SrcGID:49, ACLLogIdx:0x0, MacDA:5057.a82c.0146, MacSA: 7819.f74e.10a6 IP_SA:118.67.104.12 IP_DA:27.111.203.116 IP_Proto:6
TPFFD:EC000031_0000012C_00B00040-000000B4_02280000_A8E20000
Oct 17 21:50:58.909: ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan300 L2If:GigabitEthernet1/1/1 DI:0xB4, LT:7, Vlan:300 SrcGPN:49, SrcGID:49, ACLLogIdx:0x0, MacDA:5057.a82c.0146, MacSA: 7819.f74e.10a6 IP_SA:210.129.96.39 IP_DA:27.111.203.112 IP_Proto:6
TPFFD:EC000031_0000012C_00B0004E-000000B4_02280000_A8E20000
Oct 17 21:50:58.909: ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan300 L2If:GigabitEthernet1/1/1 DI:0xB4, LT:7, Vlan:300 SrcGPN:49, SrcGID:49, ACLLogIdx:0x0, MacDA:5057.a82c.0146, MacSA: 7819.f74e.10a6 IP_SA:118.67.104.15 IP_DA:27.111.203.116 IP_Proto:6
TPFFD:EC000031_0000012C_00B00040-000000B4_02280000_A8E20000
Oct 17 21:50:58.909: ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan300 L2If:GigabitEthernet1/1/1 DI:0xB4, LT:7, Vlan:300 SrcGPN:49, SrcGID:49, ACLLogIdx:0x0, MacDA:5057.a82c.0146, MacSA: 7819.f74e.10a6 IP_SA:118.67.104.69 IP_DA:27.111.203.116 IP_Proto:6
TPFFD:EC000031_0000012C_00B00040-000000B4_02280000_A8E20000
Oct 17 21:50:58.918: ICMP-Q:Dropped Not a candidate: Remote Port Blocked L3If:Vlan300 L2If:GigabitEthernet1/1/1 DI:0xB4, LT:7, Vlan:300 SrcGPN:49, SrcGID:49, ACLLogIdx:0x0, MacDA:5057.a82c.0146, MacSA: 7819.f74e.10a6 IP_SA:74.125.16.12 IP_DA:27.111.203.111 IP_Proto:6
TPFFD:EC000031_0000012C_00B00046-000000B4_02280000_A8E20000
We are also seeing very high icmp in our cpu-interface:
#sh controller cpu-interface | i icmp
icmp 453936786 0 0 0 0
icmp 0 0
(Taken just after)
#sh controller cpu-interface | i icmp
icmp 454015979 0 0 0 0
icmp 0 0
show processes cpu
CPU utilization for five seconds: 69%/23%; one minute: 72%; five minutes: 74%
Has anyone else seen this problem before or have a understanding of how to fix it?
Thx!
