Functions of LLDP on an AR router

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The Link Layer Discovery Protocol (LLDP) is a standard Layer 2 topology discovery protocol defined in IEEE 802.1ab. It can identify the interfaces on a network device and provide detailed information about connections between devices. It can also display paths between clients, switches, routers, application servers, and network servers.

Other related questions:
Which interfaces on the AR router support LLDP
For V200R002C00 and later versions, only Layer 2 Ethernet interfaces on the AR series router support LLDP. For V200R002C01 and later versions, Layer 2 and Layer 3 Ethernet interfaces on the AR series router support LLDP.

Does an AR router support the firewall function
All AR series routers support the firewall function.

Configure the basic firewall functions on an AR router
The basic firewall functions of an AR router include: creating a security zone and adding interfaces into the security zone, creating an interzone and enabling the firewall functions in the interzone, configuring session table aging time, and checking the configuration result. For details about the configuration, see the following content: [Creating a security zone and adding interfaces into the security zone on an AR router] Create a security zone and add interfaces into the security zone on an AR router. [Enabling the firewall functions on an AR router] Enable the firewall functions on an AR router. [Configuring session table aging time of the firewall on an AR router] Configure session table aging time of the firewall on an AR router. For details about configuration of basic firewall functions on AR series routers, see the URL: AR router configuration firewall basic functions.

Description of user levels on AR routers
User levels on AR routers are as follows: You can configure different user levels to control access rights of different users and improve device security. There are 16 user levels numbered from 0 to 15, in ascending order of priority. Visit level-0: It is used for network diagnosis, access to the external device, such as ping, tracert, and Telnet. Monitoring level-1: It is used for system maintenance, including display commands and other commands. Some display commands are unavailable at this level. For example, the display current-configuration and display saved-configuration commands are level-3 management commands. Configuration level-2: Service configuration commands. Management level-3 to 15: They are used to control basic system operations, including system file, FTP/TFTP download, user management, command level setting, and debugging commands. User levels correspond to the command levels. Users can use only the commands at the same or lower level than their own levels. By default, users logging in from the console port can run level 15 commands. By default, the user level of other login modes is 0 (visit level), that is, after the user logs in to a device, the user can only run the commands at level 0, including ping, tracert, and other commands for network diagnosis.

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