Cisco WS-X6066-SLB-APC - Content Switching Module Manual de usuario descargar pdf (Pagina 7)

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Catalyst 6000 Family Content Switching Module Installation and Configuration Note

78-11631-05

Chapter 1 Overview

Traffic Flow

This section describes how the traffic flows between the client and server in a CSM environment.

(See Figure 1-3.)

Figure 1-3 Trafﬁc Flow between Client and Server

Note The numbers in Figure 1-3 correspond to the steps in the following operation procedure.

When you enter a request for information by entering a URL, the traffic flows as follows:

1. You enter a URL. (Figure 1-3 shows www.fox.com as an example.)

2. The client contacts a DNS server to locate the IP address associated with the URL.

3. The DNS server sends the IP address of the virtual IP (VIP) to the client.

4. The client uses the IP address (CSM VIP) to send the HTTP request to the CSM.

5. The CSM receives the request with the URL, makes a load-balancing decision, and selects a server.

For example, in Figure 1-3, the CSM selects a server (X server) from the www.fox.com server pool,

replacing its own VIP address with the address of the X server and forwards the traffic to the X

server to allow the servers to initiate connections that do not have matching entries in the NAT

configuration. If a NAT server is not specified, the VIP address remains unchanged.

6. The CSM performs Network Address Translation (NAT).

www.fox.com

client

DNS

IP address

www.fox.com

IP address

www.fox.com

IP address

Content

Switching

Module

Server

www.fox.com

Server pool

47528

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Cisco WS-X6066-SLB-APC - Content Switching Module Manual de usuario Pagina 7