VID meaning of dot1Q sub-interface

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It indicates the VLAN ID in a user packet.

Other related questions:
How to configure VLAN termination on an AR router
Dot1Q termination: Create a sub-interface on the CE interface of the device, and run the dot1q termination vid pe-vid command to configure a termination VLAN for the sub-interface. QinQ termination: Create a sub-interface on the CE interface of the device, and run the qinq termination pe-vid pe-vid ce-vid ce-vid1 command to configure the two-tag termination feature for the sub-interface.

Example of configuring a dot1Q termination sub-interface on an AR router to support VRRP
An example of configuring a dot1Q termination sub-interface on an AR router to support VRRP is as follows: The roadmap of configuring a dot1Q termination sub-interface to support VRRP and implement gateway redundancy is as follows: 1. Configure IP addresses and routing protocols for different device interfaces to enable network-layer routers to be reachable. 2. Configure a VRRP group on sub-interfaces of Router A and Router B, respectively. Configure a high priority and set preemption delay to 20s on Router A and configure Router A as a master device to bear and forward traffic. Configure a low priority and configure Router B as a backup device to implement redundancy. For details about the configuration, see the URL: Example for Configuring VRRP on a Dot1q Termination Sub-interface.

Configure sub-interfaces
CE12800 and CE7800 series switches in V100R003C10 and later versions support the sub-interface configuration. CE5800 sand CE6800 series switches, except the CE6810LI, in V100R005C00 and later versions support the sub-interface configuration. The following example shows how to configure a sub-interface. system-view [~HUAWEI] interface 10ge 1/0/1 [~HUAWEI-10GE1/0/1] undo portswitch //Change the interface mode to Layer 3 mode. [*HUAWEI-10GE1/0/1] commit [~HUAWEI-10GE1/0/1] quit [~HUAWEI] interface 10ge 1/0/1.1 //Enter the sub-interface view.

How to configure a sub-interface on an AR router
A sub-interface is a virtual interface configured on a physical interface. It is generally used for the communication between a physical link and multiple remote ends. Sub-interfaces include: Ethernet sub-interfaces, Eth-Trunk sub-interfaces, PON sub-interfaces, ATM sub-interfaces, and FR sub-interfaces. Configure a sub-interface as follows: [Huawei] interface ethernet 2/0/0 [Huawei-Ethernet2/0/0] undo portswitch //Switch the current interface to a Layer-3 interface. [Huawei-Ethernet2/0/0] quit [Huawei] interface ethernet 2/0/0.1 //Enter the view of the sub-interface.

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.

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