想請問各位大大，flapping讓C4K保護機制把port err-disable block
這問題該怎麼解決?

Log如下...
Dec 20 08:54:13.604: %C4K_EBM-4-HOSTFLAPPING: Host xx:xx:xx:xx:xx:xx in vlan 15 is moving from port Po213 to port Po203
Dec 20 08:54:13.705: %C4K_EBM-4-HOSTFLAPPING: STANDBY:Host xx:xx:xx:xx:xx:xx in vlan 15 is moving from port Po213 to port Po203

Dec 20 12:18:34.570: %PM-4-ERR_DISABLE: channel-misconfig (STP) error detected on Po213, putting Gi1/3/13 in err-disable state
Dec 20 12:18:34.572: %EC-5-UNBUNDLE: Interface GigabitEthernet1/3/13 left the port-channel Port-channel213
Dec 20 12:18:34.573: %PM-4-ERR_DISABLE: channel-misconfig (STP) error detected on Po213, putting Gi2/3/13 in err-disable state
Dec 20 12:18:34.576: %EC-5-UNBUNDLE: Interface GigabitEthernet2/3/13 left the port-channel Port-channel213

現在Port-channel213 is down, line protocol is down (err-disabled)，請問要如何排除?