What is the DN set of the AR router

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A DN set is also called a dial plan. A DN set contains a set of numbers that are processed together. Only numbers, call prefixes, trunks, and routes that belong to the same DN set are processed. That is, two users must belong to the same DN set before calling each other.
A DN set, a country code, and an area code identify the home area of a user; a DN set and a call prefix determine the dialing plan for a user.
A DN set divides a physical network or a device into multiple logical networks, similar to VLANs for a LAN.

Other related questions:
What are DN sets
A dial number (DN) set is also called a dial plan. A DN set contains a set of numbers that are processed together. Only numbers, call prefixes, trunks, and routes that belong to the same DN set are processed. Two users can call each other only when the two users belong to the same DN set. DN sets determine the home of users when associated with country codes and region codes, and determine the dial rules for users when associated with call prefixes. DN sets can be used to divide a physical network into multiple logical networks even in the same device, and are similar to virtual local area networks (VLANs) in a local area network (LAN).

What is the purpose of setting the DN bit in an OSPF LSA
If a Provider Edge (PE) device advertises Type-3, 5, and 7 link-state advertisements (LSAs) to Customer Edge (CE) devices through area 0, the optional high-order bit of these LSAs must be set and called the DN bit. If these LSAs are advertised through an area other than area 0, the DN bit can be set or not set. The DN bit is used to prevent routing loops. A PE ignores any LSA whose DN bit is set. This prevents a routing loop caused when a PE learns from the CE the LSA generated by another PE in CE dual-homing scenarios. PE sets the DN-bit of Type 3, 5, and 7 LSAs and checks the DN-bit of Type 3, 5, and 7 LSAs.

How do I implement DNS resolution for L2TP users on the AR router
Host resolution is implemented by DNS. The ip host command can be used to configure static DNS entries.

Telnet timeout period configuration method on an AR router
In the user interface view, run the idle-timeout < minutes > [< seconds >] command to set user connection timeout period. By default, the user connection timeout period is five minutes. If the period is set to 0 or the value is too long, a terminal will hang in login state, which poses a security risk. You are advised to run a lock command to lock the current connection.

Measure for troubleshooting DNS faults on the AR
If the DNS fault occurs on a Huawei AR, you can perform the following operations: 1. Run the display dns dynamic-host command to check whether the specified domain name exists in the dynamic domain name cache. -If the domain name to be parsed does not exist, check whether the AR and the DNS server communicate with each other properly, whether the DNS server works properly, and whether dynamic domain name resolution is enabled. - If the domain name to be parsed exists but the IP address is incorrect, perform step 2. 2. Run the display dns server command to check the DNS server configuration. Check whether the IP address of the DNS server is correct. If the IP address of the DNS server is incorrect, run the undo dns server ip-address command to delete the configured DNS server address, and then run the dns server ip-address command to reconfigure correct IP address for the DNS server.

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