%STANDBY-3-DUPADDR: Duplicate address

Unanswered Question
Jul 11th, 2007
User Badges:

Hi netpro,

i got the log file as below.

Jul 10 14:30:17.093: %STANDBY-3-DUPADDR: Duplicate address on Vlan100, sourced by 0000.0c07.ac53

but, i have checked my vlan 100. i have not conflict with the HSRP.

any idea ?

your reply will be highly appreciated.



  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 1 (2 ratings)
mheusing Thu, 07/12/2007 - 02:37
User Badges:
  • Cisco Employee,

Hi Jack,

Follow the troubleshooting tips found at "HSRP Standby IP Address Is Reported as a Duplicate IP Address"


This should allow you to track down the underlying issue causing the messages. The real issue is not necessarily misconfigured HSRP. If you get stuck, please post your findings and the relevant portions of the device configs for further assistance.

Hope this helps! Please rate all posts.

Regards, Martin

fieus Thu, 07/12/2007 - 04:47
User Badges:

Hi Jack

Potentially a STP loop could cause this problem.



ney25 Thu, 07/12/2007 - 06:19
User Badges:

Hi Mark,

so, i just focous to that vlan which duplicated with standby interface and tracing any switch/hub or router plug into my access switch ?

your reply will be highly appreciated .




mheusing Thu, 07/12/2007 - 07:05
User Badges:
  • Cisco Employee,


I would start to do a layer2 troubleshooting, because a (transient) STP loop is the most likely cause as mentioned in the previous post. So check your switches, trunks and so on to spot possible STP issues. Additional routers connected to the VLAN can be ruled out rather quickly, if the do not have the same HSRP group as the system logging the messages from your initial post.

Regards, Martin

ney25 Thu, 07/12/2007 - 18:56
User Badges:

Hi Martin,

yes, i do agree with you. i start troubleshooting from L2. i detected 1 HP procurve switch connecting into my Access Switch.

Question .

How can i confirm this switch is causing the loop ?

thanks .




This Discussion