Table of Contents

Collect the Information Required for Configuration
Install the Cache Engine
Initialize the Cache Engine Configuration
Enable Cache Support on the Router
Test the Cache Engine Installation

Installing the Cache Engines

After you determine where you want to put the Cache Engine, follow these steps to complete the Cache Engine installation:

Step 1   Collect the Information Required for Configuration.

Step 2   Install the Cache Engine.

Step 3   Initialize the Cache Engine Configuration.

Step 4   Enable Cache Support on the Router.

Step 5   Test the Cache Engine Installation.

Read the Regulatory Compliance and Safety Information document that came with the Cache Engine before you begin the installation.

Warning Read the installation instructions before you connect the system to its power source.

Collect the Information Required for Configuration

Before you install the machine, collect the information required for the basic configuration:

• The IP address for the Cache Engine.
  
  
• The subnet address for the Cache Engine (netmask).
  
  
• The IP address of the default gateway router. (This is the gateway that allows Internet access to the Cache Engine; it is not necessarily the address of the engine's home router, although in many cases these routers are the same.)
  
  
• The IP address of the home router for the Cache Engine.
  
  
• The local date and time in Greenwich Mean Time (GMT).
  
  
• The name of the cache farm to which you are adding the Cache Engine. If this is the first engine in the farm, you can choose your own name.
  
  
• The name of the Cache Engine.
  
  

Install the Cache Engine

Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected.

Warning The device is designed to work with TN power systems.

Warning The ports labeled "Ethernet," "10BaseT," "Token Ring," "Console," and "AUX" are safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to other SELV circuits. Because the BRI circuits are treated like telephone-network voltage, avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits.

Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S. (240 VAC, 10A international) is used on the phase conductors (all current-carrying conductors).

Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use.

Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.

Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals.

Refer to Figure 2-2 and Figure 2-1 when installing the engine, to help you identify the connectors on the front and back of the engine.

• AC receptacle. Connect the power cord to this plug.
  
  
• Power switch. This switch toggles between on and off, even though the switch always returns to its initial position after you press it. Check the power light on the front of the Cache Engine to determine if the power is on (a lit power light indicates that the power is on).
  
  
• Console port. This serial port connects to a console.
  
  
• Ethernet port. Connect the Ethernet cable to this plug. The status lights above the connection are:
  
  
• LNK. When lit, indicates that the engine is connected to the network.
  
  
• ACT. When lit, indicates that the network connection is active (packets are being sent or received).
  
  
• 100 TX. When lit, indicates that the connection is a 100BaseTX (Fast Ethernet) connection.
  
  

Figure 2-1: The Cache Engine, Rear View

The Cache Engine, Front View

Step 1   Place the Cache Engine unit in the desired location. You can mount it on a rack for your convenience, or place it on a solid, stable surface. Figure 2-3 shows how to attach the mounting brackets. You will need a Phillips-head screwdriver.

Figure 2-3: Attaching the Mounting Brackets

Initialize the Cache Engine Configuration

Once you have installed the Cache Engine, and booted the engine's operating system, you must initialize the basic configuration. If the engine does not have a usable basic configuration (which is the case when you initially set up the engine), it presents the current configuration to you, and asks you to modify the configuration to make the Cache Engine usable. The engine prompts you through each configuration variable; you can back up to the previous variable by typing a hyphen (-) and pressing the Enter key.

To initialize the Cache Engine's basic configuration once it has booted the operating system:

Step 1   Enter values for these parameters as you are prompted:

• IP Address for the Cache Engine. For example, 192.168.20.121.
  
  
• IP Netmask for the Cache Engine. A netmask is calculated based on the IP address; you can accept this value by pressing Enter, or enter a different value. For example, 255.255.255.0.
  
  
• Default Gateway for the Cache Engine. This is the IP address of the router that allows you to connect to the engine using a browser, and that allows the engine to connect to the network. It is not necessarily the same IP address of the engine's home router. For example, 192.168.20.149.
  
  
• WCCP Home Router for the Cache Engine. This is the IP address of the home router, the router that forwards web traffic to this engine. Often, it is the same IP address as the default gateway. For example, 192.168.20.149.
  
  
• Replace admin Password for the Cache Engine. This is the password you want to use for the admin user account, which is predefined on the engine. The password is case sensitive and can be up to 20 characters, including spaces and any printable characters. If you want to use the same password that is used by an existing cache farm (to which you are adding this machine), or you want to keep the existing password, press Enter without typing a password. If the machine does not already have an admin password, the cache farm notifies the machine of the admin password.
  
  
• Repeat Admin Password. Verify the password for the admin user account (or press Enter without entering a password to keep the existing password).
  
  
• Cache Name for the Cache Engine. The name you want to assign to the engine. You can enter any name you find meaningful. For example, cache1. The name can be up to 20 characters, and can contain spaces and any printable characters.
  
  
• Group Name for the cache farm to which this Cache Engine belongs. You must use the same name for all Cache Engines that you want to place in the same farm. For example, mainfarm. The name can be up to 20 characters, and can contain spaces and any printable characters.
  
  
• GMT Date/Time for your network. This is the current local date and time as measured in Greenwich Mean Time (GMT). You must use GMT because the HTTP protocol uses GMT for the timestamps on HTTP objects (web pages, graphics, and so forth).
  
  

  Enter the date and time, without spaces or punctuation marks, in this format: yyyy/mm/dd hh:mm:ss, where yyyy is the four digit year (for example, 1997); mm is the two digit month (for example, 08 for August); dd is the two digit date (for example 06 for the sixth day of the month); hh is the two digit hour, from 01 to 24; mm is the two digit minutes, from 00 to 59; and ss is the two digit seconds, from 00 to 59. There is a space between the day and the hour.

  For example, to enter August 2, 1997, 8:27:53, enter 1997/08/02 08:27:53.

• Config Register. Enter 0. This field is used for serviceability: you should only enter 0 unless instructed to do otherwise.
  
  

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Note The admin user account always exists on the Cache Engine: it comes predefined, and you cannot delete it. If you forget the admin password, you must reboot the machine and press a key while the "Press any key to OVERRIDE basic low-level configuration" message is displayed. You have 10 seconds to override the configuration. Then, step through the boot configuration and enter a new password when prompted for the admin password. This change is made to all Cache Engines in the cache farm.

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Step 2   If the basic configuration is acceptable, enter y. The Cache Engine indicates whether the configuration is accepted. At this point, the basic configuration is finished.

Step 3   Once you have entered an acceptable basic configuration, the Cache Engine displays the URL that you would use to connect to it with a web browser. For example, http://192.168.20.121:8001 . You must use the complete URL to connect to the machine and manage it.

Enable Cache Support on the Router

Before the router can use the Cache Engine, it must know that the Cache Engine exists. This notification is done automatically by communications between the engine and the router. However, you must enable cache support in the router so that the router knows to listen for the Cache Engine.

If you later want to disable caching temporarily, you can do so by disabling cache support in the router, rather than by turning off or otherwise disabling the individual Cache Engines. (Use the no ip wccp command on the router to disable caching.)

You must already know how to configure the router to make these configuration changes. If you do not know how to configure the router, consult the Cisco IOS documentation supplied with the router. Detailed information for the commands mentioned here is in the Cisco IOS documentation.

To enable cache support on the router:

Step 1   Ensure that the router is running a release of the Cisco IOS software that includes the Web Cache Control Protocol. You must upgrade the Cisco IOS software if it does not have this support before you can continue.

Step 2   In global configuration mode, use the ip wccp command to enable cache support. For example, enter:

Step 3   In interface configuration mode, use the ip web-cache redirect command to have the interface redirect packets for port 80 to the Cache Engine. Enter this command for each interface that:

You can confirm your settings using these commands on the router:

• show ip wccp
  
  

• show ip wccp web-caches
  
  

• show ip interface
  
  

Test the Cache Engine Installation

Once you have installed and configured the Cache Engine, and enabled caching on the home router, check to ensure the Cache Engine is working properly:

Step 1   From a machine on a network that uses the home router, start a web browser and open various web pages on the Internet or your intranet. The web servers you connect to must be on a different subnet, so that the request goes through the home router. Connect to some pages more than once, to ensure that some pages you request are in the cache.

Step 2   Connect to the Cache Engine's home page, and click Status. There should be activity shown for the Cache Engine.

Step 3   Use Telnet to connect to the home router, and enter the show ip wccp web-caches command to display information about the Cache Engines. The entry for the Cache Engine should show a number greater than 0 for Packets Redirected.

If the router shows that no packets are being redirected to the Cache Engine, you need to troubleshoot your setup. See Chapter 5, "Troubleshooting the Cache Engine" for more information.

Posted: Sat Sep 28 01:12:32 PDT 2002
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