Symptom
The following error shows up on Corsica 1852 AP sometime:
[*11/19/2017 17:46:03.1849] DOT11_DRV[1]: Spectrum Scan state changing from 0 to 1
[*11/19/2017 17:46:53.4092] cac_timeout cac expired, chan 5540 curr time 2042
[*11/19/2017 17:52:56.1203] CLSM[F4:0F:1B:FA:88:71]: Out of range measurement slot 0 rssi 90 snr 90 nf 87 counter 1
[*11/19/2017 19:08:52.5027] ip6_port srcr6, ip6local fe80::c6b9:cdff:feee:60b8, ip6 2000:130:151:0:c6b9:cdff:feee:60b8, plen 64, gw6 fe80:130:151::1, gw6_mac 00:00:00:00:00:00, mtu 1500, vid 0, mode6 3(slaac)
