1-7
Catalyst 6500 Series Content Switching Module Configuration Note
OL-4612-01
Chapter 1 Product Overview
Operation
Operation
Clients and servers communicate through the CSM using Layer 2 and Layer 3 technology in a specific
VLAN configuration. (See Figure 1-2.) In a simple Server Load Balancing (SLB) deployment, clients
connect to the client-side VLAN and servers connect to the server-side VLAN. Servers and clients can
exist on different subnets. Servers can also be located one or more Layer 3 hops away and connect to the
CSM through routers.
A client sends a request to one of the module’s VIP addresses. The CSM forwards this request to a server
that can respond to the request. The server then forwards the response to the CSM, and the CSM forwards
the response to the client.
When the client-side and server-side VLANs are on the same subnets, you can configure the CSM in
single subnet (bridge) mode. For more information, see the “Configuring the Single Subnet (Bridge)
Mode” section on page 2-1.
When the client-side and server-side VLANs are on different subnets, you can configure the CSM to
operate in a secure (router) mode. For more information, see the “Configuring the Secure (Router)
Mode” section on page 2-4.
You can set up a fault-tolerant configuration in either the secure (router) or single subnet (bridged) mode
using redundant CSMs. For more information, see the “Configuring Fault Tolerance” section on
page 7-1.
Single subnet (bridge) mode and secure (router) mode can coexist in the same CSM with multiple
VLANs.
Figure 1-2 Content Switching Module and Servers
Router
Internet
Internet
Client
47527
Switching
fabric
Content
services
gateway
Catalyst 6500 chassis
4 gigabit
Content
provider
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