Does the AR need to be configured with the Layer 2 interface card to support the AC function

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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.

Other related questions:
Does the Layer 2 interface card on an AR support port mirroring
The Layer 2 interface card of an AR supports port mirroring.

Does an AR router support an interface being switched over between Layer 2 and Layer 3
The following AR routers support an interface being switched over between Layer 2 and Layer 3. By default, Ethernet interfaces are Layer 2 interfaces. Run the undo portswitch command to switch the interfaces from Layer 2 mode to Layer 3 mode, and run the portswitch command to switch the interfaces back to Layer 2 mode. V200R006C00 and earlier versions: - AR150 and AR200 series: Eth0/0/0 - AR120-S series: Eth0/0/0~Eth0/0/3 - AR150-S, AR160-S, and AR200-S series (except for AR151-S2): Eth0/0/0 - AR151-S2: GE0/0/0 - AR160 series: GE0/0/0 - AR1220F: Eth0/0/0~Eth0/0/7 - AR2201-48FE, AR2202-48FE, and AR2201-48FE-S: Eth0/0/0 and Eth0/0/47 V200R007C00: - AR120 and AR150 series, AR120-S series, AR151-S, AR151W-P-S, and AR151G-U-S: Eth0/0/0~Eth0/0/3 - AR160 series, AR509G-L-D-H, AR110-S series, AR151-S2 and AR160-S series: GE0/0/0~GE0/0/3 - AR200 series, AR1220, AR1220V, AR1220W, AR1220VW, AR1220F, AR200-S series, AR1220-S, AR1220W-S, and AR1220F-S: Eth0/0/0~Eth0/0/7 - AR1220C, AR1220E, AR1220EV, AR1220EVW, and AR1220E-S: GE0/0/0~GE0/0/7 - AR2201-48FE and AR2202-48FE: Eth0/0/0~Eth0/0/47 - AR2204-51GE-P: GE0/0/3~GE0/0/50 - AR2204-27GE-P, AR2204-27GE, and AR2201-48FE-S: GE0/0/3~GE0/0/26 V200R008C00: - AR120 (except for AR129CGVW-L) and AR150 series, AR120-S series, AR151-S, AR151W-P-S, and AR151G-U-S: Eth0/0/0~Eth0/0/3 -AR100 series, AR160 series, AR129CGVW-L, AR503EW, AR503EDGW-Lc, AR509CG-Lt, AR509CG-Lc, AR509G-Lc, AR515GW-LM9-D and AR509G-L-D-H, AR100-S series, AR110-S series, AR151-S2 and AR160-S series: GE0/0/0~GE0/0/3 - AR200 series, AR1220, AR1220V, AR1220W, AR1220VW, and AR1220F, AR200-S series, AR1220-S, AR1220W-S, and AR1220F-S series: Eth0/0/0~Eth0/0/7 - AR1220C, AR1220E, AR1220EV and AR1220EVW, and AR1220E-S: GE0/0/0~GE0/0/7 - AR2201-48FE, AR2202-48FE, and AR2201-48FE-S: Eth0/0/0 and Eth0/0/47 - AR2204-51GE-P, AR2204-51GE-R, and AR2204-51GE: GE0/0/3~GE0/0/50 - AR2204-27GE-P and AR2204-27GE: GE0/0/3~GE0/0/26 At present, the interfaces of all cards do not support Layer 2 and Layer 3 interface switchover.

Does the Ethernet LAN interface card of an AR router provide Layer-2 interfaces or Layer-3 interfaces
All interfaces provided by the Ethernet LAN interface card of an AR router are Layer-2 Ethernet interfaces. Ethernet LAN cards of AR routers include the following models: 8FE1GE: a WSIC card that provides 8 FE interfaces and a GE interface 9ES2: a WSIC card that provides 8 FE electrical interfaces and a GE electrical interface 24GE: an XSIC card that provides 24 GE electrical interfaces 4GE-2S: a WSIC card that provides 4 GE optical interfaces 4ES2G-S: a SIC card that provides 4 GE electrical interfaces 4ES2GP-S: a SIC card that provides 4 GE electrical interfaces

Does the E1 interface of an AR router support the layer 2 forwarding
The E1 interface of an AR router does not support the layer 2 forwarding because the protocol used by the E1 interface is different from the protocol used by the Ethernet over layer 2.

Configuring the firewall to use Layer 2 interfaces as heartbeat interfaces
If you want to use a Layer 2 interface as the heartbeat interface, you need to add it to the VLAN, create the VLANIF interface, and configure the IP address of the VLANIF interface. Then use the VLANIF interface as the heartbeat interface and set the remote parameter to specify the heartbeat interface IP address of the peer device.

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