I have a 3850 stack running ip services on version 03.02.03.SE of IOS-XE. I have multiple SVI's on the stack and getting duplicate ip address messages in the logs.
I have checked that the stack has come up properly and they are both reporting ready and are active/standby. I have recreated the stack a couple of times and each time its the same.
Any ideas? Bug maybe?
They are all like this:
Jun 30 13:55:41.568: %IP-4-DUPADDR: Duplicate address x.x.x.x on Vlan6, sourced by <MAC address>
The IP address of the interface is not used anywhere else on the network, as they were reserved for this building. The only place the IP address exists is on the SVI on the stack.
ok, find out what port this mac address is coming from, then go under the physical port and add this command
nmsp attachment suppress
then clear the log and test again.
It's on both sides of the port channel which is trunked. Does it need to go on the physical interfaces that are in that vlan?
Basically it's a 3850 stack running ip services connected to a larger 3850 stack running IP Base.
I have added this command on all the physical ports on both stacks. Still getting the duplicate address messages in the log.
Anything else I can look at? As I say, the stack looks fine and the IP addresses it is complaining about only exist on the SVI on the ipservices stack.
There is a newer version of IOS-XE that is recommended on the Cisco site. Should I go for this?
DOH! Fixed this. Turns out someone put the SVI on the ipbase stack thinking it needed to be there. Removed them and its now sorted. Thanks for the assist.