Can the DHCP snooping function be implemented if a router does not have a LAN card

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The DHCP snooping function can be implemented on the LAN card only.
To set limits to source MAC address, create a Layer 2 ACL which cannot substitute the DHCP snooping function.

Other related questions:
Can DHCP snooping be implemented on an AR with no LAN card
DHCP snooping can only be provided by the LAN card. To limit source MAC addresses without a LAN card installed, the AR can use a Layer 2 ACL. However, Layer 2 ACL is not a replacement for DHCP snooping.

Can a router provide DHCP snooping function without using a LAN card
No, DHCP snooping function can only be provided by the LAN card. To restrict source MAC addresses without a LAN card installed, the router can use Layer 2 ACL. However, Layer 2 ACL is not a replacement for DHCP snooping.

Does the AR need to be configured with the Layer 2 interface card to support the AC function
To directly connect an AP to an AR, use the LAN interface of the AR. For details about LAN interfaces on the AR, see Huawei AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600 Product Documentation>Get to Know the Product >Hardware Description. LAN interfaces are described in Appearance of the corresponding product. You can install a LAN interface card on the device to provide more LAN interfaces. For details about the LAN interface card or other interface cards supported by the device, see Ethernet LAN Interface Card in Huawei AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600 Product Documentation>Get to Know the Product >Hardware Description. For details about the LAN cards supported by AR routers, see Huawei AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600 Product Documentation Get to Know the Product > Hardware Description > Cards > Ethernet LAN Interface Card.

How do I configure an Ethernet sub-interface to implement inter-VLAN communication
Generally, only one primary IP address can be configured for a physical interface. When a Layer 3 device connects to a Layer 2 network device through a Layer 3 Ethernet interface and interfaces on the Layer 2 network device are assigned to different VLANs, one primary IP address of the Layer 3 physical interface cannot implement inter-VLAN communication. You can configure secondary IP addresses or sub-interfaces for the Layer 3 Ethernet interface to solve this problem. The secondary IP addresses depend on the primary IP address. When the primary IP address becomes invalid, the secondary IP addresses also become invalid. The sub-interfaces and main interface are independent. Sub-interfaces share physical layer parameters of their main interface, and are configured with their respective link layer parameters and network layer parameters. The IP address of the main interface and IP addresses of sub-interfaces are independent. You can create sub-interfaces on the Ethernet interface connecting the Layer 3 device to the Layer 2 device so that users in different VLANs can communicate.

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