Restrictions and precautions for using OSPF

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Restrictions and precautions for using OSPF are as follows:
To establish an OSPF neighboring relationship, devices need to exchange DD packets. DD packets are OSPF unicast packets. By default, OSPF unicast packets are not forwarded under the control of security policies. Therefore, you need to configure a security policy on the FW to permit the OSPF packets between the Local zone and the security zone where the neighboring device resides. Otherwise, the OSPF neighboring relationship fails to be established.
Or you can run the undo firewall packet-filter basic-protocol enable command to disable the function of security policy control over OSPF unicast packets. After that, the firewall directly forwards OSPF unicast packets even if a security policy whose action is deny is configured.

Other related questions:
Restrictions and precautions of the AR router used as the WLAN AC
The restrictions and precautions of the AR router used as the WLAN AC are as follows: Precautions for parameter settings: 1. In tunnel forwarding mode, the mVLAN and service VLAN must be different. 2. The device used as the AC only supports direct forwarding of service packets. It does not support tunnel forwarding. License support: The WLAN AC function is used with a license and is unavailable by default. To use the AC function, apply for and purchase the following license from the agent according to the device model: 1. AR150&160&200 series routers: AR150&160&200 value-added service package for data services and AR150&160&200 wireless controller license 2. AR1200 series routers: AR1200 value-added service package for data services and AR1200 wireless controller license 3. AR2200 series routers: AR2200 value-added service package for data services and AR2200 wireless controller license 4. AR3200 series routers: AR3200 value-added service package for data services and AR3200 wireless controller license To use WLAN-AC functions, you must load both value-added service package for data services and wireless controller license. A license is used according to the value-added service package loaded on the device; therefore, load a value-added service package before loading the corresponding license. The mapping between the AC and AP is as follows: Read the product documentation of the required version. Huawei APs must be used.

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