A process of ipv6 causing high cpu in Cisco 6509

The core switch is Cisco6509E, and the problem is that the cpu soars from 20% to 60%.
1. Use the command show proc cpu sort 5min on Cisco6509 to see that the reason for the high cpu is ipv6 input

2. Then capture each vlan under Cisco6509 There are 12 buildings in total
. 3. The main purpose is to capture IPv6 packets

to find the host with the mac address of 14:3d:f2:b8:8a:32, seal it on the switch, and the cpu returns to normal.