If the MPLS packet length of an NQA test instance is greater than the MTU of a specified MPLS tunnel, MPLS packets fail to pass through the tunnel. To allow the packets to pass through the tunnel, run the fragment enable command to enable MPLS packet fragmentation.
Example
# Enable MPLS packet fragmentation for an NQA test instance.
<HUAWEI> system-view
[~HUAWEI] nqa test-instance user test
[*HUAWEI-nqa-user-test] test-type vplsping
[*HUAWEI-nqa-user-test] fragment enable