What cause "err-disable"? see below conditions
1. Port-channel misconfiguration
2. DHCP snooping rate-limiting
3. Duplex mismatch
4. Bridge Protocol Data Unit(BPDU) Guard violation
5. UniDirectional Link Detection(UDLD) condition
6. Late-collision detection
7. Link-flap detection
8. Security violation
9. Port Aggregation Protocol(PAgP) flap
10. Layer 2 Tunneling Protocol(L2TP) guard
11. EtherChannel guard detects a misconfiguration.
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