What cautions should be taken when configuring Option 43 on an AC

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When the AC is deployed on a Layer 3 network, you must configure Option 43. It is optional when the AC is deployed on a Layer 2 network.

Other related questions:
What cautions should be taken when configuring DHCP Option 60 and Option 43 on a Layer 2/Layer 3 network?
DHCP Option 43 and Option 60 must be configured on a Layer 3 network, while they are optional on a Layer 2 network.

Configuring the DHCP Option 43 field on an AC
Perform the following operations to configure the DHCP Option 43 field on an AC that functions as a DHCP server: 1. Run the system-view command to enter the system view. 2. Run the dhcp enable command to enable the DHCP function. 3. Run the ip pool ip-pool-name command to enter the global address pool view. 4. Run the option 43 sub-option 2 ip-address ip-address &<1-8> command to set the DHCP Option 43 field to the IP addresses of the active and standby ACs.

How is DHCP Option 43 configured on an AR
Option 43 is a vendor specific information option. If an AP and an AC are located on different network segments, the AP cannot discover the ACs through broadcast. To address this problem, configure Option 43 on the DHCP server to advertise AC's IP addresses to the AP. The AR functions as the DHCP server and the AC's IP address is 192.168.22.1. The configuration of Option 43 is as follows: - Based on the global address pool: [Huawei] dhcp enable [Huawei] ip pool huawei [Huawei-ip-pool-huawei] network 192.168.100.0 255.255.255.0 [Huawei-ip-pool-huawei] gateway-list 192.168.100.1 [Huawei-ip-pool-huawei] option 43 sub-option 3 hex 31302E31302E31302E31 //Run the option 43 sub-option 3 ascii 192.168.22.1 command. - Based on the interface address pool: [Huawei] dhcp enable [Huawei] interface gigabitethernet 1/0/0 //Enter the view of the interface connected to the AP. [Huawei-GigabitEthernet1/0/0] ip address 10.10.10.10 24 [Huawei-GigabitEthernet1/0/0] dhcp select interface [Huawei-GigabitEthernet1/0/0] dhcp server 43 sub-option 3 hex 31302E31302E31302E31 //Run the dhcp server option 43 sub-option 3 ascii 192.168.22.1 command. If an Option 43 contains multiple AC IP addresses, the IP addresses are separated by commas (,). The ASCII value of commas (,) is 2C. For example, if the ACs' IP addresses are 192.168.22.1 and 192.168.22.2, run the option 43 sub-option 3 hex 3139322E3136382E3130302E322C3139322E3136382E3130302E33 or option 43 sub-option 3 ascii 192.168.22.1,192.168.22.2 command.

What cautions should be taken when configuring a Layer 2 access network between APs and the gateway on a WLAN
All downlink ports connected to APs on access and aggregation switches must be isolated from each other. If a packet transport network (PTN) is deployed between APs and the gateway, use leased lines but not a private network.

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