Before migration, the virtual machine network is normal and can be pinged。
Migrating virtual machines from one exsi host to another
The virtual machines network will be down for a while，About a few minutes, up to 20 minutes, and then it's done automatically
or login by vcenter console，Ping the gateway from inside the virtual machine to the outside,or resrat network service,it will be normal.
I suspect it is the ARP problem(the function of MAC address triggers ARP update) of Huawei switch.
Have you encountered it? thanks
Check the Port Security Configuration Commands of your switch.
User as reference, but check your model:
Some switches keep the mac table static after their learn the MAC so when the vm is migrated that table is not updated (by the security config) and thats why the vm doesnt work.
I had this issue but with other switches and was related to this. (Cannot be certain if this is exactly your problem but at least is worth looking into)
Hope that helps,