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Cisco Bug: CSCvh79433 - C9400: "kernel: ICMPv6: NA: someone advertises our address" seen when neighbor bootup

Last Modified

Oct 30, 2019

Products (1)

  • Cisco Catalyst 9400 Series Switches

Known Affected Releases

16.6.3 Fuji-16.8.1

Description (partial)

Below message is seen intermittently on the sup even if the IPv6 is not enabled for the SUP:

*Jan 30 23:25:19.358 PST: %IOSXE-4-PLATFORM:  R0/0: kernel: ICMPv6: NA: someone advertises our address fe80:0000:0000:0000:02a0:c9ff:fe00:0020 on mgmtbr!

This message is harmless and has no functional impact. It should be ignored until it gets fixed

When neighbor switches boot up or reload, the following message might be seen.  "neighbor" means switches connected to the same subnet as the g0/0 management port.
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