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)

Symptom:
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

Conditions:
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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