08-25-2014 07:48 AM - edited 03-07-2019 08:31 PM
Please let me know if anyone is familiar with this issue and help me to fix this.
switch#sh processes cpu sort | e 0.00
CPU utilization for five seconds: 94%/6%; one minute: 92%; five minutes: 89%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
285 4913147 10514143 467 64.33% 61.31% 59.08% 0 DHCPD Receive
220 16941161 46086550 367 15.20% 14.51% 13.64% 0 IP Input
218 352631 131808 2675 1.12% 0.82% 0.79% 0 IP ARP Adjacency
12 20286991 31265792 648 0.95% 0.79% 0.80% 0 ARP Input
Let me know if you need further information on it.
Thanks,
Rakesh Sandhu
08-25-2014 11:51 AM
Hello,
could it be a client device flooding DHCP requests?
do you have access to wireshark?
if not i saw on a post to setup an ACL for DHCP with log turned on and see if all of them are coming from the same MAC address.
08-28-2014 12:21 AM
This got fixed. One IP phone was connected in two diff VLAN and LAN was learning one mac on two different ports causing DHCP storm. Disconnecting one cable on phone fixed this issue. Thanks all for your help.
08-25-2014 12:00 PM
Hey Rakesh,
Depending upon the platform use we may monitor the traffic directed to CPU, if it's:
3750:
4500:
You may check which host is sending the DHCP packets to CPU and isolate it from network.
HTH.
Regards,
RS.
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