Hello!
It would be great if you could provide some extra details concerning the fault. I would like to enquire on the following points though:
1. What's the topology of the network? Mikrotik and Huawei routers are directly connected?
2. I understand you can't ping Mikrotik from AR. How about the AR router from Mikrotik, can you ping it?
3. Are you able to see the MAC address of the Mikrotik router being learned on the interface of the AR?
Please refer to the following command to finish this step:
display mac-address g0/0/1 \\\ use the interface number that connects to the Mikrotik.
Please see some additional details below:
4. Check whether there is an ARP entry learning on AR for the Mikrotik router.
Please see the following link, which shows you how to check the ARP entries:
5. Can you share the configuration of Huawei and Mikrotik? You can mask the private information.
To check the Huawei configuration, run 'display current' on the system view. Check here for details: