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Configuring Server Load Balancing
IOS SLB Functions and Capabilities
IPC-134
Cisco IOS IP Configuration Guide
Security of the real server is provided because its address is never announced to the external network.
Users are familiar only with the virtual IP address. You can filter unwanted flows based on both IP
address and TCP or UDP port numbers. Though it does not eliminate the need for a firewall, IOS SLB
also can help protect against some denial-of-service attacks.
In a branch office, IOS SLB allows balancing of multiple sites and disaster recovery in the event of
full-site failure, and distributes the work of load balancing.
Figure 23 illustrates a logical view of IOS SLB.
Figure 23 Logical View of IOS SLB
IOS SLB Functions and Capabilities
Functions and capabilities supported in IOS SLB are described in the following sections:
• Algorithms for Server Load Balancing
• Port-Bound Servers
• Client-Assigned Load Balancing
• Content Flow Monitor Support
• Sticky Connections
• Maximum Connections
• Delayed Removal of TCP Connection Context
• TCP Session Reassignment
• Automatic Server Failure Detection
• Automatic Unfail
• Slow Start
Client Client
Client
Client
Catalyst 4840G
with IOS SLB
Real
server
Real
server
Virtual server
Real
server
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