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%STANDBY-3-DUPADDR: Duplicate address

I am getting continuos error on my core switches where i am running hsrp.... the MAC reporting as Duplicate is the Virtual MAC of HSRP. I have read the Documentation where cisco is talking about STP & Mulfunctioning of the switch. I have tested for the STP loops but i did not find any. How i could check whether my switch is proper or malfunctioning, as i dont see any problem, the core switches are 4507R. find below the error message.

Vlan8, sourced by 000d.2822.f57f

.Jan 3 01:22:17.834 SA: %STANDBY-3-DUPADDR: Duplicate address 132.1.1.251 on Vl

an1, sourced by 0000.0c07.ac00

.Jan 3 01:50:43.226 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.160.2 on Vla

n11, sourced by 0000.0c07.ac00

.Jan 3 01:51:40.778 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.80.2 on Vlan

6, sourced by 0000.0c07.ac00

.Jan 3 02:00:43.142 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.48.2 on Vlan

4, sourced by 0000.0c07.ac00

.Jan 3 02:02:54.930 SA: %STANDBY-3-DUPADDR: Duplicate address 10.40.1.2 on Vlan

40, sourced by 0000.0c07.ac00

.Jan 3 02:05:59.782 SA: %STANDBY-3-DUPADDR: Duplicate address 10.1.32.2 on Vlan

22, sourced by 0000.0c07.ac00

.Jan 3 02:44:14.190 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.16.2 on Vlan

2, sourced by 0000.0c07.ac00

.Jan 3 02:57:19.330 SA: %STANDBY-3-DUPADDR: Duplicate address 10.40.1.2 on Vlan

40, sourced by 0000.0c07.ac00

.Jan 3 03:25:30.578 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.112.2 on Vla

n8, sourced by 000d.2822.f57f

.Jan 3 03:34:35.917 SA: %STANDBY-3-DUPADDR: Duplicate address 10.1.16.2 on Vlan

21, sourced by 0000.0c07.ac00

.Jan 3 03:37:49.661 SA: %STANDBY-3-DUPADDR: Duplicate address 132.1.1.251 on Vl

12 REPLIES
Bronze

Re: %STANDBY-3-DUPADDR: Duplicate address

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi,

I once faced this issue. I changed the standby group id (on both cores)and the issue was solved. If all your Vlan are using id 1 and a particular Vlan is giving you DUP error, just try to change the standby Id for that Vlan. It worked for me.

But what cisco says is its because of some "route leaking".

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi Sonu,

Thanks alot for your reply..

As you can see my output i am getting the duplicate error from almost all of my VLAN configured for HSRP, i have changed the vlan 3 to the different group (Group 3) but still i am getting the error on that also. below given is the output.

.Jan 3 04:53:42.513 SA: %STANDBY-3-DUPADDR: Duplicate address 10.1.16.2 on Vlan

21, sourced by 0000.0c07.ac00

.Jan 3 04:58:39.309 SA: %STANDBY-3-DUPADDR: Duplicate address 10.28.16.2 on Vla

n28, sourced by 0000.0c07.ac00

.Jan 3 05:11:46.537 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.48.2 on Vlan

4, sourced by 0000.0c07.ac00

.Jan 3 05:15:16.585 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.32.2 on Vlan

3, sourced by 0000.0c07.ac03

.Jan 3 05:20:59.941 SA: %STANDBY-3-DUPADDR: Duplicate address 10.1.48.2 on Vlan

23, sourced by 0000.0c07.ac00

.Jan 3 05:23:25.609 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.32.2 on Vlan

3, sourced by 0000.0c07.ac03

.Jan 3 05:51:44.973 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.112.2 on Vla

n8, sourced by 000d.2822.f57f

.Jan 3 06:00:54.193 SA: %STANDBY-3-DUPADDR: Duplicate address 10.28.16.2 on Vla

n28, sourced by 0000.0c07.ac00

.Jan 3 06:22:45.377 SA: %STANDBY-3-DUPADDR: Duplicate address 10.0.128.2 on Vla

Bronze

Re: %STANDBY-3-DUPADDR: Duplicate address

check if the standby group configured are same for other switches..

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi Arun,

Yes both the switches are having the same HSRP Groups configured. this setup is running from last 4 Years. We did not face any problem & as well did not do any changes on the core switch.From January first 2008 we are getting this errors.

How can we check the switch if it is malfunctioning (4507)

Cisco Employee

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi Friend,

Can you check the logs from both the switch and confirm if there are any other logs then the one you have posted? I mean any host flapping or port channel flapping etc.?

Is any thing is changed in config from the time you started observing these error messages?

Regards,

Ankur

Bronze

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi

As u mentioned this logs comes only when STP looping is there.Did u find anything form the link posted above..

Lets hear more from experts abt this....

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hello,

I ran into a similar thing and the solution came from adding UDLD config to my ports. This prevented the Spanning-Tree loops that were occuring as a result of poor cables (Mine were fiber). Do you have any UDLD config on your interfaces?

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi,

You are seeing this on multiple VLANs I see, this is the canary in the coal mine for a bridging loop or STP reconvergence issue.

What type of STP are you running?

Also, what's up with VLAN 8 sourcing an HSRP address from a real address? That might be something to check out.

How did you look for bridging loops? Have you looked for TCNs, high link utilization, can you locate you roots?

p.s. - There is no such thing as an STP loop, STP's job is to *prevent* a loop.

Thanks!

John

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi,

As I mentioned I have two core switches (4507-R) Core Switch 01 is the Root for Vlan 1-6,11,21-26,28-29,40,57-59,132,137 & Core Switch 02 is the Root for vlan 7-10,134-136.

STP Type is PVST. VLAN 8 sourcing MAC is the virtual MAC for the VLANs 7-10,134-136.

I have checked for the STP Loops but could not find. There is one more problem noticed in my Access Switches, the Switch Port which is cascaded to the Switch Connected to my core Switch that port is getting Error Disable.

Regards,

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

Hi All,

I experienced this issue today. It happened to both my core switches [Cat6509, CatOS 8.3(4), MSFC IOS 12.2(17d)SXB6].

HSRP is configured for many VLAN segments but only VLAN 1 was affected. The issue lasted momentarily, for about half hour.

I strongly suspect occurrence of a bridging loop may have caused this issue. Checking all the connected switches, I found no sign of a bridging loop. STP converges normally and as per design for VLAN 1. Redundant links are correctly blocked.

Can anyone shed some light on the issue?

Thank you.

B.Rgds,

Lim TS

New Member

Re: %STANDBY-3-DUPADDR: Duplicate address

I have the same issue and it started Dec 3.

I have confirmed that the problem is not on our core switches(where the messages are logged). I have enabled bpduguard on every interface and none of them went error-disbaled. I was asked by Cisco tech to apply access list denying the hsrp packet that is causing the problem on every port of the switch.This temp fixed it but haven't found who is sending the packet. The log command on the access-list didn't log any hits but the errors stopped occuring. I started removing the access-list off the ports on port-by-port basis and did a tcpdump on the rx side on the port and found the packet coming in and still don't know from where since it is a layer 1 100 M MAN link. I have asked the carrier to troublshoot and didn't find any problem. I am still working on it and i have a tac case opened. I will let you know what i find

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