07-30-2003 04:24 PM - edited 03-02-2019 09:14 AM
I have just started getting these errors on both my MSFC's. I have received these errors on 2 vlans with hsrp running. Here is the log entry:
Jul 30 22:29:07 gmt: %STANDBY-3-DUPADDR: Duplicate address 10.66.44.253 on Vlan900, sourced by 0000.0c07.ac5a
Jul 30 22:30:00 gmt: %STANDBY-3-DUPADDR: Duplicate address 10.66.44.253 on Vlan900, sourced by 0000.0c07.ac5a
I no for a fact that this is not a node that has the same address. PLease Help.
07-30-2003 05:26 PM
Are these messages constant or just 1 or two after hsrp bounces ? I have seen this when one of the VLANs bounce that has hsrp configured , if the message is not constant I would not sweat it .
07-30-2003 07:48 PM
That particular vlan was just a couple but earlier in the day I had a vlan do it continuously. This juat began today. So to say the least I am stumped...
07-31-2003 12:18 AM
check the spanning tree. If there is a network loop, this message will occur. I have such experience.
07-31-2003 05:00 AM
What would cause a loop in this situation? I have no redundant links to a switch that uses this particular vlan.
07-31-2003 12:26 AM
Hi,
this is the output from the Error Message Decoder:
"1. %STANDBY-3-DUPADDR: Duplicate address IP_address] on [chars], sourced by [enet]
The IP address in an HSRP message received on the interface is the same as the router's own IP address. This condition may be caused by a network loop, a misconfiguration, or a malfunctioning switch.
Recommended Action: Ensure that there are no network loops, check the configuration on all the HSRP routers, and make sure that all switches are correctly configured and functioning properly.
Related document: Cisco - Understanding and Troubleshooting HSRP Problems in ... "
I suppose 0000.0c07.ac5a is your HSRP group virtual MAC adddress. So I think there might be a loop in your network causing the HRSP router to receive packets originated by itself.
Regards,
Milan
07-31-2003 01:05 AM
According to CCO document
http://www.cisco.com/en/US/customer/tech/tk648/tk362/technologies_tech_note09186a0080094afd.shtml
Troubleshooting HSRP Case Studies chapter contains information about your problem.
this is a normal message for HSRP configurations and it can be suppressed by using an ACL.
Regards,
07-31-2003 01:18 AM
If you read the document carefully it doesn't say "it's a normal message". It says:
"These error messages do not necessarily indicate an HSRP problem. Rather, the error messages indicate a possible Spanning Tree Protocol (STP) loop or router/switch configuration issue. The error messages are just symptoms of another problem."
And
"Furthermore, there is a method to prevent the active router from receiving its own multicast hello packet by using an access-list. This is only a work-around for the error messages however. This work-around actually hides the symptom of the problem."
So ACL only suppresses the error messages bot doesn't fix the problem.
Regards,
Milan
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