H3C Technologies H3C SR8800 - Manual (Page 162)

151
34 packets input, 2856 bytes
0 input error
34 packets output, 2856 bytes
0 output error
Troubleshooting MPLS TE
No TE LSA generated
Symptom
OSPF TE is configured but no TE LSAs can be generated to describe MPLS TE attributes.
Analysis
For TE LSAs to be generated, at least one OSPF neighbor must reach the FULL state.
Solution
1. Perform the display current-configuration command to check that MPLS TE is configured on
involved interfaces.
2. Perform the debugging ospf mpls-te command to observe whether OSPF can receive the TE LINK
establishment message.
3. Perform the display ospf peer command to check that OSPF neighbors are established correctly.
Swicthback fails to occur when the main tunnel resumes
Symptom
When data is transmitted along the protection tunnel, the main tunnel becomes normal but data still
travels along the protection tunnel. In the output of the display mpls te protection tunnel command, the
Switch Result field has a value of Protect-tunnel and the Work-tunnel defect state field has a value of
No-defect.
Analysis
Possible reasons include:
• The reverting mode is non-revertive.
• The reverting delay period is relatively long.
• A switching command with higher priority forces data to travel along the protection tunnel.
Solution
1. Execute the display mpls te protection tunnel command. If the Mode field in the output is
Non-revertive, the configuration defines that reverting should not occur. If you expect that
protection switching will be triggered when the main tunnel recovers, you can configure the mpls
te protection tunnel command in the main tunnel interface view to set the reverting mode as
revertive.
2. If the Mode field is revertive and the WTR field is a non-zero value, the reverting delay timer has
expired. When the timer expires, if the main tunnel still has no defect, data will be switched back
to the main tunnel. If you hope the switchover occurs immediately when the main tunnel recovers,
you can use the mpls te protection tunnel command to change the reverting delay time to 0.