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Features of DistributedDirector
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DistributedDirector has several features that provide additional functionality and configuration options
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Server Availability Parameter
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When this function is enabled, DistributedDirector will try to establish a TCP connection to each of the distributed servers over a configurable interval (every 10 seconds, every 1 minute, every 10 minutes, etc) Distributed servers yielding successful TCP connections are marked as being available This function allows DistributedDirector to make sure the best server is an available server as well
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Multiservice Support
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With multiservice support, DistributedDirector can enable load distribution of several services running on dispersed servers Figure 13-10 illustrates the distribution of HTTP and FTP services across three servers
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Figure 13-10: Multiservice distribution
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In order to support transparent, global load distribution of SMTP-based e-mail services, DistributedDirector now supports DNS MX (Mail Exchange) Resource Records This means DistributedDirector can be used to redirect client e-mail requests to the best SMTP server, through a single DNS MX Resource Record NoteThis feature requires configuration of DistributedDirector in DNS Caching Nameserver mode
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Policy Redirection
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Policy redirection uses access control lists (ACLs) to direct IP service requests to a single server or to distribute the service requests across a subset of servers based on client IP address and subnet mask This feature is particularly useful when you want to redirect known clients to specific servers Policy redirection can be used in both DNS Caching Nameserver and HTTP Redirect modes
DistributedDirector Applications
As a rule of thumb, DistributedDirector can distribute any IP traffic across multiple servers provided that each server has a unique IP address The distributed servers need not be on the same physical network DNS Caching Nameserver mode allows distribution of all TCP and UDP traffic types HTTP Redirect mode is only for the distribution of HTTP services The traffic types/applications that can be distributed by DistributedDirector include the following: Web (HTTP) services FTP/TFTP services Telnet services E-mail posting servers Proxy services H323 gateway services Multimedia services TN3270 session distribution access multiple Cisco Channel Interface Processors (CIPs) Nearest home gateway discovery in conjunction with L2F or L2TP protocol Cisco LocalDirector traffic distribution
Cisco's LocalDirector
There is a growing demand for mission-critical TCP/IP-based application services such as ecommerce, video, e-mail, and many others This demand is motivating companies to increase the
reliability of networks and servers
What Is LocalDirector
Cisco's LocalDirector offers companies a network-based, server-and-application clustering solution By using a hardware and software solution, LocalDirector balances the load of user traffic across multiple TCP/IP servers All physical servers appear as one virtual server, requiring only one IP address and URL By tracking network sessions and server load conditions in real time, LocalDirector can direct each session to the most appropriate server Tracking is based on the session distribution algorithm (SDA)
Session Distribution Algorithm (SDA)
The session distribution algorithm (SDA) is based on a passive approach that determines the most appropriate server based on the following criteria: Least connections Weighted configured values Fastest server Linear random selection Source IP SDA's many benefits include the following: Operating system independent Hardware independent Supports any TCP application Development of features instead of ports to operating system
Benefits of LocalDirector
LocalDirector ensures certain benefits to a distributed environment; these include continuous, high availability of content, and applications with proven techniques for actively managing servers and connections By distributing user requests across a cluster of servers, LocalDirector optimizes responsiveness and system capacity, and dramatically reduces the cost of providing large-scale Internet, database, and application services In addition, its integrated security device is capable of protecting servers from unauthorized access
High Server Availability
The LocalDirector system uses a three-point system for detecting availability This system Snoops TCP/IP handshake and data exchange between client and server to the port level, to analyze availability Proactively probes Web servers with HTTP requests (This can be defined and customized by the user) Uses a communication protocol to define server load and, if a server is down, to let LocalDirector know Two LocalDirectors can be installed to provide a stateful failover mechanism that effectively eliminates all points of failure across the server farm The second LocalDirector always maintains the states of current user connections If the first LocalDirector fails, the second LocalDirector can take over immediately without dropping any sessions In addition, configuration changes made to the first LocalDirector are automatically duplicated to the second LocalDirector This reduces
potential configuration problems and ensures a robust failover system Following are the primary high-availability features offered by LocalDirector: Stateful failover mechanism eliminates all points of failure and enables configuration of robust, high-availability server farms Automatic detection and removal of failed applications improves overall server-farm management and reliability Web-application probing technology monitors servers for application availability, application health, and database connectivity, effectively routing and directing traffic only to available applications "Auto-unfail" feature ensures a graceful shutdown that maintains existing connections without adding new connections to failed or removed servers "Hot standby" server allows servers and ports to back up other services and ports, increasing availability "Hot standby" configuration is replicated, reducing administrative startup costs by automatically transferring the primary LocalDirector configuration to the secondary one
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