Troubleshooting Mpls Te; No Te Lsa Generated; Swicthback Fails To Occur When The Main Tunnel Resumes - HP 12500 Series Configuration Manual

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
Perform the display current-configuration command to check that MPLS TE is configured on
1.
involved interfaces.
Perform the debugging ospf mpls-te command to observe whether OSPF can receive the TE LINK
2.
establishment message.
Perform the display ospf peer command to check that OSPF neighbors are established correctly.
3.

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
Execute the display mpls te protection tunnel command. If the Mode field in the output is
1.
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.
If the Mode field is revertive and the WTR field is a non-zero value, the reverting delay timer has
2.
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.
If your case is neither 1) nor 2), check the The current switch command field in the output of the
3.
display mpls te protection tunnel command. If its value is Force, a switching action with a higher
priority than the signal switching is configured. If you expect that signaling can trigger switchover
when the main tunnel recovers, you can use the mpls te protect-switch clear command to clear all
configured switching actions.
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