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This chapter describes how to configure the Server Load Balancing (SLB) switch processor so it can be accessed by other devices. For further information about the commands used in this chapter, refer to the command reference publications in the Cisco IOS documentation set and to "Command Reference."
This chapter includes the following sections:
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Note You are at Step 2 in the suggested process for configuring your SLB switch. See the "Configuring Your SLB Switch" section. By now you have set up the hardware and are ready to proceed with configuring the SLB processor. |
Before starting up the SLB switch, you should verify the following:
When you start up the SLB switch, the CLI prompts you whether to enter the initial configuration dialog. Answer no to this prompt:
Would you like to enter the initial dialog? [yes]: no
You see the following user EXEC prompt:
SLB-Switch>
You can now begin configuring the SLB switch.
You can configure the SLB switch from a direct console connection to the console port or remotely through its management port.
For further details on configuring ports and lines for management access, refer to the Cisco IOS Configuration Fundamentals Configuration Guide .
You can connect a modem to the console port on the Catalyst 4840G SLB switch. The following settings on the modem are required:
You can configure your modem by setting the DIP switches on the modem or by connecting the modem to terminal equipment. Refer to the user manual provided with your modem for the correct configuration information.
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Note Because there are no hardware flow control signals available on the console port, the console port terminal characteristics should match the modem settings. |
For further details on configuring ports and modems for management access, refer to the Cisco IOS Configuration Fundamentals Configuration Guide and Dial Solutions Configuration Guide .
The enable password is a nonencrypted password. It can contain any number of uppercase and lowercase alphanumeric characters. Give the enable password only to users permitted to make configuration changes to the SLB switch.
The enable secret password is a secure, encrypted password. By setting an encrypted password, you can prevent unauthorized configuration changes. On systems running Cisco IOS software, you must type in the enable secret password before you can access global configuration mode.You must type in the enable secret password to access boot ROM software.
An enable secret password can contain from 1 to 25 uppercase and lowercase alphanumeric characters. The first character cannot be a number. Spaces are valid password characters. Leading spaces are ignored; trailing spaces are recognized.
You will configure passwords in the "Configuring the Management Port" section.
| Command | Purpose | |
|---|---|---|
Step 1 |
| Enters privileged EXEC configuration mode. You can also abbreviate the command to ena. The |
Step 2 |
| Enters global configuration mode. You can also abbreviate the command to config t. The |
Step 3 | | Sets the enable password. See the "Using Passwords" section. |
Step 4 | | Enters an enable secret password. Once set, a user must enter the enable secret password to gain access to global configuration mode. |
Step 5 |
| Enters interface configuration mode on the interface. |
Step 6 |
| Enters the IP address and IP subnet mask for the interface. |
Step 7 | | Enables the interface. |
Step 8 |
| Returns to global configuration mode. |
Step 9 |
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Step 10 |
| Enters a password for Telnet sessions. |
Step 11 |
| Returns to privileged EXEC mode. |
Step 12 | | Saves your configuration changes to NVRAM. |
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Note Any Fast Ethernet interface, fastethernet 1 through 40 and any Gigabit Ethernet interface, gigabitethernet 41 or 42, on the Catalyst 4840G SLB switch can be configured as a management port. Once you have configured an interface as a management port, you cannot route or bridge traffic to the other Ethernet ports on the SLB switch from this management port. |
The Catalyst 4840G SLB switch should now be operating correctly. You can now use Telnet to remotely assign and verify configurations.
You can display the configuration file when you are in privileged EXEC (enable) mode.
SLB-Switch# more system:running-config
SLB-Switch# more nvram:startup-config
If you made changes to the configuration, but did not yet write the changes to NVRAM, the contents of the running-config file will differ from the contents of the startup-config file.
| Command | Purpose | |
|---|---|---|
Step 1 | SLB-Switch# | Enters global configuration mode. |
Step 2 | SLB-Switch(config)# | Specifies a system name. |
Step 3 | SLB-Switch(config)# | Returns to privileged EXEC mode. |
Step 4 | SLB-Switch# | Saves your configuration changes to NVRAM. |
This section describes how to use a Flash PC Card to copy system images and make standard configurations. A Flash PC Card is not required for the operation of the SLB switch.
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Note A Flash PC Card must be ordered as a spare part. It is recommended that you use a 20 MB Flash PC Card to download and store a copy of the SLB switch software image. Doing so allows you to store two or more images at the same time. |
Flash PC Cards store a copy of the software image. The following sections describe how to format, delete, configure, and copy files between the onboard Flash memory Single In-Line Memory Module (SIMM), network servers, and Flash PC Card.
A Flash PC Card is blank and must be formatted before use. The formatting procedure erases all information on the Flash PC Card.
Following is the general procedure for formatting a Flash PC Card:
Step 2 Insert the Flash PC Card you want to format into slot 0.
Step 3 Format the Flash PC Card using the format command.
The following example demonstrates formatting a Flash PC Card in slot 0 and naming it "NewPCcard":
SLB-Switch# format slot0: Format operation may take a while. Continue? [confirm] y Enter volume ID (up to 30 characters): NewPCcard Formatting sector 1 Format device slot0 completed
This example uses a 16-MB Flash PC Card. At the line Formatting sector 1, the system counts the card's sectors backward from 128 to 1 as it formats them. For 20-MB Flash PC Cards, the system counts backward from 160 to 1.
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Note For more information on inserting a Flash PC Card, refer to the Catalyst 4840G Chassis Installation Guide. |
Use the following command to copy the startup configuration file from NVRAM to a Flash PC Card once the Flash PC Card is formatted and ready to use:
Command | Purpose |
|---|---|
SLB-Switch# copy nvram:startup-config flash-device |
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The following example demonstrates copying the startup configuration file to the Flash PC Card in slot 0; the default filename is used:
SLB-Switch#copy nvram:startup-config slot0:Destination filename [startup-config]?y3790 bytes copied in 0.484 secsSLB-Switch#
To determine which file system device you are accessing, use the pwd (print working directory) command, as shown in the following example:
SLB-Switch# pwd bootflash
To move between Flash memory media, use the cd command, as shown in the following example:
SLB-Switch# cd slot0: SLB-Switch# pwd slot0 SLB-Switch#
To list the directory contents of any Flash memory media, use the dir command, as shown in the following example:
SLB-Switch# dir Directory of slot0:/ 1 -rw- 3509000 Jan 25 1999 19:46:25 cat4840G-in-mz.120-1.W5.6a.bin 3 -rw- 3509004 Feb 5 1999 19:46:25 cat4840G-in-mz.120-1a.W5.6b.bin 4 -rw- 2386 Feb 19 1999 17:25:36 startup-config 16384000 bytes total (9360836 bytes free) SLB-Switch#
When you delete a file from Flash memory, the system marks the file as deleted, allowing you to later recover a deleted file using the undelete command. Erased files cannot be recovered. To permanently erase the configuration file, use the squeeze command.
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Caution When deleting files from memory, be careful not to delete all the system images. If you delete all existing system images, you can no longer download new images. |
The following is an example of the delete and squeeze commands used together. Note that the delete command requires you to specify the filename, while the squeeze command requires that you specify the Flash memory media (for example, slot0:).
SLB-Switch# delete cat4840G-in-mz.X.bin SLB-Switch# dir Directory of slot0:/ 4 -rw- 2386 May 11 1999 17:25:36 startup-config 16384000 bytes total (9360836 bytes free) SLB-Switch#
The image file is marked for deletion. Use the squeeze command to complete the operation.
SLB-Switch# squeeze slot0: All deleted files will be removed, proceed? [confirm] y Squeeze operation may take a while, proceed? [confirm] Y ebESESESESESESESES SLB-Switch# dir 4 -rw- 2386 May 11 1999 17:25:36 startup-config 12869836 bytes available (1825540 bytes used)
Table 3-1 lists and describes the output that could be generated from a squeeze command.
| Output Letter | Description |
|---|---|
e | This special location was erased (which must be performed before any write operation). |
b | The data about to be written to this special location was temporarily copied. |
E | The sector temporarily occupied by the data was erased. |
S | The data was written to its permanent location in Flash memory. |
Z | This log was erased after the squeeze command was successfully completed. |
Future releases of Cisco IOS system images can be obtained from a network server, a floppy disk, or a Flash PC Card. This section describes how to configure the SLB switch so that it boots from an image on a Flash PC Card. To enable booting from a Flash PC Card, perform the following steps:
| Command | Purpose | |
|---|---|---|
Step 1 | SLB-Switch# configure terminal SLB-Switch(config)# | Enters global configuration mode. |
Step 2 | SLB-Switch(config)# no boot system | Disables booting from bootflash. |
Step 3 | SLB-Switch(config)# boot system flash [flash-fs:] [partition-number:] [filename] | Enables booting from the image name file on the specified Flash file system device. |
Step 4 | SLB-Switch(config)# config-reg 0x2102 | |
Step 5 | SLB-Switch(config)# end SLB-Switch# | Exits global configuration modes. |
Step 6 | SLB-Switch# copy system:running-config nvram:startup-config | Saves the configuration to NVRAM. |
Step 7 | SLB-Switch# reload | Reboots the system. |
When you enter boot commands, be careful not to insert extra spaces because they influence the way the SLB switch interprets the command. For example, notice the difference in the following commands:
The following command correctly instructs the SLB switch to boot the image1 file.
SLB-Switch(config)# boot system flash slot0:image1
The following command incorrectly contains a space between "slot0:" and "image2." The SLB switch finds the filename field blank and so boots the first file on the Flash PC Card.
SLB-Switch(config)# boot system flash slot0: image2
Before you copy software between the network server and Flash memory in the SLB switch, perform the following tasks:
To create a backup of the system software on a TFTP server, perform the following steps:
| Command | Description | |
|---|---|---|
Step 1 | SLB-Switch# cd filesystem: | Changes the Flash device to the slot that holds the Flash PC Card. |
Step 2 | SLB-Switch# show flash all |
Note the name of the image file you want to copy. |
Step 3 | SLB-Switch# copy flash tftp: |
The following example demonstrates copying a specified system image file from the current flash device to the default TFTP server:
SLB-Switch#copy flash tftp: Source filename []? cat4840G-in-mz.X.binAddress or name of remote host [172.8.1.129]?yDestination filename [cat4840G-in-mz.X.bin]?y
It is a good idea to have a copy of the current system image on a Flash PC Card in case the file in Flash memory becomes corrupted. You can then replace the system software by copying the backup image from the Flash PC Card to the onboard Flash memory. Perform the following steps to copy the system image from the TFTP server to a Flash PC Card:
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Note Be sure that you have a properly formatted Flash PC Card in the appropriate slot before beginning this procedure. |
| Command | Description | |
|---|---|---|
Step 1 | SLB-Switch# cd filesystem: | Changes the Flash device to the slot that holds the Flash PC Card. |
Step 2 | SLB-Switch# pwd | Verifies that you are in the right directory. |
Step 3 | SLB-Switch# copy tftp flash: | Copies a file from a TFTP server to Flash memory. |
The following example demonstrates copying a system image file from the default TFTP server to the current Flash PC Card:
SLB-Switch#copy tftp flash: Source filename []? cat4840G-in-mz.X.binAddress or name of remote host [172.8.1.129]?yDestination filename [cat4840g-in-mz.X.bin]?y5746016 bytes available on device slot0, proceed? [confirm]y
Now that you have configured the processor, see "Configuring Interfaces," for instructions on interface configurations for your SLB switch.
Posted: Thu Sep 28 15:22:15 PDT 2000
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