I'm getting strange log warnings on most of my Catalysts, both C3650 (16.3.6), C2960S (15.0.2) and one C4500-sup7l (03.06.08). vl50 is the Management-Interface.
The log entries show up exactly 5 minutes apart. Its almost as if the switches are detecting their own ND
Aug 29 07:03:02.454: %IPV6_ND-6-DUPLICATE_INFO: DAD attempt detected for FC00:0:0:1::29 on Vlan50 Aug 29 07:03:31.667: %IPV6_ND-6-DUPLICATE_INFO: DAD attempt detected for FE80::1A80:90FF:FE97:1A68 on Vlan50
This is a ipv6 interface of a SVI:
Vlan50 is up, line protocol is up IPv6 is enabled, link-local address is FE80::1A80:90FF:FE97:1A68 No Virtual link-local address(es): Description: MGMT Global unicast address(es): FC00:0:0:1::29, subnet is FC00:0:0:1::/64 Joined group address(es): FF02::1 FF02::1:FF00:29 FF02::1:FF97:1A68 MTU is 1500 bytes ICMP error messages limited to one every 100 milliseconds ICMP redirects are enabled ICMP unreachables are sent ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds (using 30000) ND NS retransmit interval is 1000 milliseconds
i tried to SPAN on various points in the network but couldnt find anything weird.
Am i hitting some sort of bug and can discriminate that log entry?
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