ii
Symptom ································································································································································· 21
Troubleshooting flowchart ···································································································································· 22
Solution ··································································································································································· 22
Related commands ························································································································································· 23
Troubleshooting ports ················································································································································· 25
Fiber port remains in down state ·································································································································· 25
Symptom ································································································································································· 25
Troubleshooting flowchart ···································································································································· 26
Solution ··································································································································································· 26
Copper port remains in down state ····························································································································· 28
Symptom ································································································································································· 28
Troubleshooting flowchart ···································································································································· 28
Solution ··································································································································································· 28
Non-H3C transceiver module ······································································································································· 29
Symptom ································································································································································· 29
Troubleshooting flowchart ···································································································································· 29
Solution ··································································································································································· 29
Transceiver module does not support digital diagnosis ····························································································· 30
Symptom ································································································································································· 30
Troubleshooting flowchart ···································································································································· 31
Solution ··································································································································································· 31
Error frames (for example, CRC errors) on a port ······································································································ 32
Symptom ································································································································································· 32
Troubleshooting flowchart ···································································································································· 32
Solution ··································································································································································· 32
Failure to receive packets ·············································································································································· 34
Symptom ································································································································································· 34
Troubleshooting flowchart ···································································································································· 34
Solution ··································································································································································· 35
Failure to send packets ·················································································································································· 36
Symptom ································································································································································· 36
Troubleshooting flowchart ···································································································································· 36
Solution ··································································································································································· 36
Related commands ························································································································································· 38
Troubleshooting system management ······················································································································· 39
High CPU utilization ······················································································································································ 39
Symptom ································································································································································· 39
Troubleshooting flowchart ···································································································································· 39
Solution ··································································································································································· 39
High memory utilization ················································································································································ 41
Symptom ································································································································································· 41
Troubleshooting flowchart ···································································································································· 41
Solution ··································································································································································· 42
Related commands ························································································································································· 42
Troubleshooting other problems ································································································································ 43
Layer 2 forwarding failure ············································································································································ 43
Symptom ································································································································································· 43
Troubleshooting flowchart ···································································································································· 44
Solution ··································································································································································· 44
Related commands ················································································································································ 48
Layer 3 forwarding failure ············································································································································ 49
Symptom ································································································································································· 49
Troubleshooting flowchart ···································································································································· 50
