Cisco Cisco Prime Network Registrar 8.0 白書

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White Paper

Cisco Prime Network Registrar DNS Service
Enhancements

What You Will Learn

The Domain Name System (DNS) protocol is a dynamic database that provides mapping between host names, IP

addresses, text records, mail exchange (MX) records, name server (NS) records, and security key information.

Cisco Prime

™

Network Registrar is a high-performance, scalable, integrated DNS, Dynamic Host Configuration

Protocol (DHCP), and IP address management (IPAM) (DDI) solution that supports both IPv4 and IPv6

deployments on a single server. The latest release of the product (version 8.2) includes several new DNS

capabilities, including support for DNS views, Domain Redirect, NXDOMAIN Redirect, and ENUM configuration.

This white paper includes an overview of these new capabilities along with a summary of other advanced features

within this high-performance, scalable, reliable DNS service from Cisco.

Introduction

DNS is an essential component of Internet functionality, and the protocol’s first specifications were published by

the Internet Engineering Task Force (IETF) in 1983. Since then, DNS features have evolved both as open source

and proprietary technology. Cisco has dedicated extensive time and resources to development of its DNS

functionality, which is a component of Cisco Prime Network Registrar.

One major area of differentiation between the Cisco

implementation of DNS and open source DNS products such

as Internet Systems Consortium (ISC) Berkeley Internet Name Domain (BIND) is that of database architecture.

File-based products such as BIND require a complete database reload when resource records are added or

removed. This can delay new deployments for individual users by up to a day. By contrast, Cisco Prime Network

Registrar updates individual DNS records in its database in real time, providing a significant performance benefit.

Advanced DNS Features Introduced in Cisco Prime Network Registrar Version 8.0

Cisco Prime Network Registrar DNS is standards compliant, supports both IPv4 and IPv6, and is reliable with

support for High-Availability DNS (HA-DNS). High-performance DNS caching delivers query throughput that far

exceeds competitive solutions. Advanced DNS features included the following.

Support for High-Availability DNS

With HA-DNS, a second primary server can be made available as a hot standby that shadows the main primary

server. The Cisco Prime Network Registrar web UI and command-line interface (CLI) have features that allow

duplication of the primary setup for the server pair. The server pair is responsible for detecting communication

failures, power outages, and other network issues. Once HA-DNS is configured, shadowing and error detection

are automatic.

HA-DNS is used with Dynamic DNS (DDNS). When a DHCP server issues a lease, it can add corresponding DNS

host records to the DNS authoritative server, using the DDNS protocol. This maps a client host name to the leased

IP address. Without DDNS support, DHCP performance may be affected.