How do I check whether LSP flapping occurs on an AR

You can run the display mpls lsp command to check the number of LSPs. If the number of LSPs changes frequently, LSP flapping occurs. In this case, run the snmp-agent trap enable feature-name mpls_lspm command. If the alarm about LSPs is frequently generated, LSP flapping occurs. Run the undo snmp-agent trap enable command.
For example:
#Jul 25 22:49:18 2020 HUAWEI LSPM/5/TRAP:1.3.6.1.2.1.10.166.2.0.2 LSP 210958 Changes to Down
#Jul 25 22:49:19 2020 HUAWEI LSPM/5/TRAP:1.3.6.1.2.1.10.166.2.0.1 LSP 210958 Changes to Up
The preceding information shows that the LSP alternates between Up and Down.

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