%IPV6_ND-6-DUPLICATE INFO: DAD attempt detected for

[Lance Wendel]

Hi all,

my customer has added IPv6 to their  BYOD WLAN subnet and are seeing  the following log messages on their Cat6k syslog

%IPV6_ND-6-DUPLICATE_INFO: DAD attempt detected for FE80:: on VlanABC

%IPV6_ND-6-DUPLICATE_INFO: DAD attempt detected for FE80:: on VlanXYZ

%IPV6_ND-4-DUPLICATE_OPTIMISTIC: Duplicate address FE80:: on VlanYYY

%VRRS-6-INFO: Internal info, VlanABC: Duplicate address detected on the network FE80:: -Process= "IPv6 Input", ipl= 0, pid= 577

The  FE80:: is their LL-HSRP IPv6 address for these vlans . It seems that quite a number of clients is probing the RA  address.

my customer is querying if there is a way to disable this?

any advice please?

thanks in advance

Lance

[cadet alain]

Hi,

the clients that are probing this address is normal if they have it configured as they ipv6 default gateway.

DAD attempts is normal way for IPv6 to test if it can use an IP.

The only problem I see here  is that for VlanABC there was a duplicate address detected by the catalyst but I'm not an expert with this platform so I can't tell if this is  problematic here.

Regards

Alain

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[hara12386]

Hello,

I am facing the same issue, have you found a fix?

Many thanks,

Hamid

[Harold Ritter]

Hi @hara12386 ,

This post is 10 years old. Could you please open a new request and provide the relevant information.

Regards,

[hara12386]

Hello @Harold Ritter 

Thank you for your feedback, I found the following bug CSCvd81898 that fits, so I applied the workaround and I am monitoring the situation.

In case it won't fix the issue, I will open a new request.

Thank you,

Hamid

[Harold Ritter]

Thanks @hara12386 . Let us know if the workaround for CSCvd81898 does not solve the issue.

Regards,