H3C LS-3100-52P-OVS-H3 Operation Manual page 88

Analysis:
The problem can be caused by the following.
The intervals for sending Advertisement packets on Device A and Device B are not the same.
DLDP authentication modes/passwords on Device A and Device B are not the same.
Solution:
Make sure the interval for sending Advertisement packets, the authentication mode, and the password
on Device A and Device B are the same.
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