Load Balancing and Failover

Chapter 2 Deploy the Access Control Servers

Deploying ACS Servers to Support Server Failover

only create an 80-percent load on the other ACS for the duration of the outage. If the WAN is not suitable for authentication connections, we recommend using two or more ACSs on the LAN in a primary or secondary mode or load balanced.

Determining How Many ACS Servers to Deploy in Wireless Networks

In planning how many ACS servers to deploy in a wireless network, consider:

•The location and number of access points. For example, with 4,200 APs:

–One ACS could handle half of the APs as primary server.

–Other ACSs could handle the remaining APs.

•The number of EAP-TLS clients together with EAP-TLS authentications per second

•The number of clients

•Scalability with different protocols

For example, if you use EAP-TLS, you will need more ACS servers; but, if you use PEAP, you will need fewer. EAP-TLS is slower than PEAP due to public-key infrastructure (PKI) processing time.

For a detailed formula that you can be use to calculate the number of ACS servers required in a wireless network, see the white paper titled Deploying Cisco Secure ACS for Windows in an Aironet Environment, available on Cisco.com at:

http://www.cisco.com/en/US/products/sw/secursw/ps2086/prod_white_papers_list.html

Deploying ACS Servers to Support Server Failover

This section discusses deployment topologies for implementing server failover. This section contains:

•Load Balancing and Failover, page 2-13

•Database Replication Considerations, page 2-13

•Database Synchronization Considerations, page 2-14

To implement load balancing, you can set up user groups and then assign groups to a specific

RADIUS server (usually the nearest RADIUS server).

Database Replication Considerations

Database replication replicates selected database information, such as user and group information, from a primary ACS to one or more ACS backups or clients. The following aspects of replication are configurable with ACS:

•Configuration components for replication—What is replicated.

•Replication scheduling—When replication occurs.

•Replication frequency—How often systems are replicated.

•Replication partners—Which systems are replicated.

	Configuration Guide for Cisco Secure ACS 4.2
	Configuration Guide for Cisco Secure ACS 4.2
OL-14390-02		2-13
OL-14390-02		2-13

4.2 specifications

Cisco Systems, a global leader in IT and networking solutions, has consistently evolved to meet the demands of modern enterprises. One of its noteworthy offerings is Cisco Systems 4.2, a version that embodies a significant leap in networking technology and capability. With its rich set of features, Cisco Systems 4.2 caters to a wide range of industries, facilitating enhanced performance and security.

One of the main features of Cisco Systems 4.2 is its improved scalability. The architecture has been designed to support an ever-increasing number of devices and users, making it ideal for growing enterprises. The enhanced scalability allows organizations to expand their network capacities without compromising performance, ensuring seamless integration of new technologies and devices.

Another critical aspect of Cisco Systems 4.2 is its advanced security protocols. With cyber threats constantly evolving, Cisco prioritizes security in this version by offering robust features such as end-to-end encryption, improved firewall capabilities, and enhanced intrusion detection systems. These security enhancements provide organizations with peace of mind, knowing that their sensitive data and networks are well-protected from unauthorized access and potential threats.

Cisco Systems 4.2 also introduces intelligent automation features, which significantly streamline network management. Through the use of artificial intelligence and machine learning, Cisco enables organizations to automate routine tasks, reduce human error, and optimize performance. This automation not only enhances efficiency but also allows IT teams to focus on strategic initiatives rather than day-to-day maintenance.

Moreover, Cisco Systems 4.2 emphasizes infrastructure flexibility. The new architecture supports various deployment models, including on-premises, cloud, and hybrid environments. This flexibility enables organizations to adapt their networking strategies according to their specific needs and operational requirements, facilitating a more tailored approach to IT infrastructure.

Collaboration tools have also been enhanced in this version. Cisco Systems 4.2 integrates advanced communication solutions that empower teams to collaborate in real time, regardless of their geographical location. Features such as high-definition video conferencing, secure messaging, and file sharing enhance productivity and foster innovation across teams.

In summary, Cisco Systems 4.2 stands out as a forward-thinking networking solution with key features such as scalability, advanced security, intelligent automation, flexible infrastructure, and enhanced collaboration tools. These characteristics position Cisco Systems 4.2 as an invaluable asset for enterprises striving for digital transformation in an increasingly interconnected world. The ongoing innovation reflects Cisco's commitment to delivering cutting-edge technology solutions that drive business success and resilience.

Cisco Systems 4.2 Deploying ACS Servers to Support Server Failover, Load Balancing and Failover

Models: 4.2

Deploying ACS Servers to Support Server Failover