What are DN sets

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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).

Other related questions:
What is the DN set of the AR router
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.

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.

DNS server parameter settings on S series switch
When S series switches (except S1700 switches) function as DHCP servers, they can deliver DNS service parameters to clients through DHCP. The configuration process is as follows: - Interface address pool: [HUAWEI] dhcp enable [HUAWEI] interface vlanif 100 [HUAWEI-Vlanif100] ip address 10.10.10.10 24 [HUAWEI-Vlanif100] dhcp select interface [HUAWEI-Vlanif100] dhcp server dns-list 192.168.1.254 //Configure an IP address for the DNS server. [HUAWEI-Vlanif100] dhcp server domain-name huawei.com //Configure a domain name suffix. - Global address pool: [HUAWEI] ip pool global1 [HUAWEi-ip-pool-global1] dns-list 192.168.1.254 //Configure an IP address for the DNS server. [HUAWEI-ip-pool-global1] domain-name huawei.com //Configure a domain name suffix. - Using a DHCP Option template: [HUAWEI] dhcp option template template1 [HUAWEI-dhcp-option-template-template1] dns-list 192.168.1.254 //Configure an IP address for the DNS server. [HUAWEI-dhcp-option-template-template1] domain-name huawei.com //Configure a domain name suffix.

DNS on the USG9000 series
A Domain Name System (DNS) is a host naming mechanism in character string format of TCP/IP to establish the mapping between domain names and IP addresses. It is a mechanism of mapping easy-to-remember and meaningful domain names to IP addresses recognizable for network devices.

DNS on the USG6000 series
A Domain Name System (DNS) is a host naming mechanism in character string format of TCP/IP to establish the mapping between domain names and IP addresses. It is a mechanism of mapping easy-to-remember and meaningful domain names to IP addresses recognizable for network devices.

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