Cisco Systems 78-11741-02 manual IOS SLB Configuration Task List, IPC-140

Configuring Server Load Balancing

IOS SLB Configuration Task List

•Does not support coordinating server load-balancing statistics among different IOS SLB instances for backup capability.

•Supports FTP only in dispatched mode.

•Does not support load balancing of flows between clients and real servers that are on the same LAN VLAN.

•Does not support IOS SLB and Cisco Applications and Services Architecture (CASA) configured with the same virtual IP address, even if they are for different services.

•Supports Cisco IOS NAT in directed mode with no hardware data packet acceleration. (Hardware data packet acceleration is performed by the Policy Feature Card (PFC), and in directed mode the data packets are handled by the Multilayer Switched Feature Card (MSFC), not the PFC.)

Catalyst 6000 family switch restrictions are as follows:

•Requires the MSFC and the PFC.

•Requires that the Multilayer Switching (MLS) flow mode be set to full. For more information about how to set the MLS flow, refer to the “Configuring IP Multilayer Switching” section in the Catalyst 6000 Family MSFC (12.0) & PFC Configuration Guide, Release 5.4.

•When IOS SLB is operating in dispatched mode, real servers must be Layer 2-adjacent to the IOS SLB switch (that is, not beyond an additional router), with hardware data packet acceleration performed by the PFC. All real servers that can be reached by a single IOS SLB device must be on the same VLAN. The loopback address must be configured in the real servers.

•When IOS SLB is operating in directed mode with server NAT, real servers need not be Layer

2-adjacent to the IOS SLB switch. This allows for more flexible network design, because servers can be placed several Layer 3 hops away from the IOS SLB switch.

•Requires that all real servers that can be reached by a single IOS SLB device must be on the same VLAN. The loopback address must be configured in the real servers.

–Supports NativeIOS only and C6sup-is-mz images. Cisco 7200 series restrictions are as follows:

•In dispatched mode, the servers must be Layer 2-adjacent or tag-switched. In directed mode, the servers can be one or more hops away.

•Supports Cisco IOS NAT in directed mode with no hardware data packet acceleration. Provides no hardware acceleration for the IOS SLB function for either dispatched mode or directed mode.

•Supports C7200-is-mz images.

IOS SLB Configuration Task List

Configuring IOS SLB involves identifying server farms, configuring groups of real servers in server farms, and configuring the virtual servers that represent the real servers to the clients. To configure the IOS SLB feature, perform the tasks described in the following sections in the order listed. Some tasks are required; others are optional.

•Specifying a Server Farm (Required)

•Specifying a Load-Balancing Algorithm (Optional)

•Specifying a Bind ID (Optional)

•Specifying a Real Server (Required)

•Configuring Real Server Attributes (Optional)

Cisco IOS IP Configuration Guide

IPC-140