Termination sub-interfaces that connect two devices cannot ping each other. Why

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After you configure IP addresses for termination sub-interfaces that connect two devices, they cannot ping each other. Check whether you have run the arp broadcast enable command on the interfaces. If this command is not run, the devices fail to send ARP Request packets through these interfaces and cannot learn ARP entries. By default, the arp broadcast enable command is disabled in V200R003C00 and earlier versions and enabled in V200R003C01 and later versions.

Other related questions:
After configuring the IP address on a sub-Interface, why can I not ping the sub-interface
You have to run arp broadcast enable on the sub-interface to be able to ping the sub-interface.

The reason why a device directly connected to an AR router cannot be pinged or the IP address of the device that is obtained over DHCP is returned slowly
In Layer 2 networks, STP can solve network loop problems. By default, this function is enabled on an AR router. If the AR router is used as a user access device (the WAN interface of the router is connected to the Internet, and the LAN interface is connected to an intranet), there is no risk of loop generally. In this case, you are advised to run the stp disable command to disable STP and avoid interface blockage due to the enabled STP function or network flapping due to STP convergence. For example, a device directly connected to an AR router cannot be pinged or the IP address of the device that is obtained over DHCP is returned slowly.

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