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Contents
Introduction ····················································································· 1
General guidelines ····················································································································· 1
Collecting log and operating information ························································································· 1
Collecting common log messages ··························································································· 2
Collecting diagnostic log messages ······························································································· 4
Collecting operating statistics ································································································· 5
Contacting technical support ········································································································ 7
Troubleshooting Ethernet interfaces ····················································· 7
Failure to ping the directly connected device ···················································································· 7
Symptom ··························································································································· 7
Solution ····························································································································· 7
Failure to forward packets ············································································································ 8
Symptom ··························································································································· 8
Solution ····························································································································· 8
Packet dropping ························································································································ 8
Symptom ··························································································································· 8
Solution ····························································································································· 8
Related commands ···················································································································· 9
Troubleshooting E1 and T1 interfaces ················································ 10
Common E1 and T1 interface issue troubleshooting methods ···························································· 10
Troubleshooting the hardware ······························································································ 10
Troubleshooting the cables ·································································································· 10
Troubleshooting the configuration ························································································· 11
Troubleshooting the clocks ·································································································· 12
Troubleshooting the grounding ····························································································· 13
Troubleshooting through looping ··························································································· 17
Troubleshooting E1/T1 interfaces ································································································ 18
Troubleshooting physical interface anomaly ············································································ 19
Data transmission anomaly ································································································· 19
Collecting information ········································································································· 19
Troubleshooting IPsec ····································································· 20
Failure to negotiate IPsec SAs through IKE ··················································································· 20
Symptom ························································································································· 20
Solution ··························································································································· 20
Related commands ·················································································································· 24
Troubleshooting PPPoE ·································································· 25
Authentication failure in PPPoE dialup ·························································································· 25
Symptom ························································································································· 25
Solution ··························································································································· 25
Related commands ············································································································ 26
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