20088 1 ccna3 3.1-06 switch configurations

CCNA3: Switching Basics and Intermediate Routing v3.0

CISCO NETWORKING ACADEMY PROGRAM

Chapter 6 – Switch Configuration

Switch Configuration

Starting the switch

Configuring the Switch



Module 6 – Switch Configuration Brierley

Switch Overview

Color System Status

Off System is not powered on.

Green System is operating normally.

Amber System is receiving power butis not functioning properly.

Switches contain CPU, RAM, Operating System

POST

When switched on – System LED

indicates status




Status LED Overview

• Mode button toggles between different port modes

• Port mode displayed on Port Mode LEDs

• Individual Port status above each port




Port Status 1




Port Status 2




User Mode Commands




Switch Management• Connect to switch via console connection• Give switch IP address on management VLAN 1

Switch(config)#interface vlan 1

Switch(config-if)#ip address 192.168.1.2 255.255.255.0

• Use web-browser based managementSwitch(config)#ip http server




Switch Configuration 1• Erase any existing settings

– VLAN database– Configuration in NVRAM

• Reload the switch




Switch Configuration 2 - Security

• Static MAC address • Port Security




Switches

• Contain:–CPU

–RAM

–Operating System




LED Indicators

Default setting




POST Test & Initial boot Up, and Help

• Console into a switch with the same cable used to console into a router

• Use same settings in Hyperterminal

• Context sensitive help is available from the command line – using the question mark as you would in router help.




Catalyst IOS Intro

• User EXEC mode and Privileged EXEC mode.– enable command.

• IOS based switch is just like the router IOS.– configure command – go to global config mode.– copy run start – to save config to NVRAM.

• Host Name configuration -1-255 characters– hostname [name]

• Comment to help identify the interface.– description [description-string] - interface config. mode– Use quotes when using spaces in string.

• IOS-based: same as on a router.– access help by entering ?




Default Configuration

• When powered up w/out configuration, the default name is Switch.

• No passwords have been configured.

• All switch ports are part of VLAN 1

• Switch has no IP address

• Show version shows the IOS version and the configuration register.




Actual Configuration• First,– Remove any VLAN info (delete flash: vlan.dat)– Erase startup– Reload

• Follow router configuration method to configure hostname, line passwords, set a default gateway, etc.

• Set IP address for management VLAN1 for telnet access.

• Fast Ethernet ports default to auto-speed and auto-duplex, or they can be set manually.

• Management of a switch can also be done using a GUI interface as long as HTTP service is turned on.




Remote Access to Switch

• To telnet, ping, or globally manage the switch:– Enter an IP address and management VLAN.

• Configuration– interface vlan 1 – ip address [address][mask]– ip default-gateway [address]– Verify with show ip interface




Defining port speed / duplex

• Speed:– Interface config mode: – speed [10 | 100 | auto]

• Line mode is either full duplex or half duplex.– Interface config mode: – duplex [auto | full | half]

– auto option only for fixed Fast Ethernet TX ports.




Backup on TFTP Server

• IOS-based commands:– copy run tftp – to save config file to

tftp server.– copy tftp run – to download config

from tftp server to active config and to NVRAM.




VLAN Configuration• Entering VLAN Database

– Switch#vlan database– Switch(vlan)#

• Adding VLANs– Switch(vlan)#vlan 15 name Accounting

• Deleting VLAN database– Switch#delete flash:vlan.dat

• Assigning ports to a VLAN– Switch(config)#interface FastEthernet 0/12– Switch(config-if)#switchport access vlan 15

• Verify VLAN Configuration– Switch#show vlan




MAC Address Table

• Switches learn the MAC addresses of workstations that are connected to their switch ports by examining the source address of frames that are received on that port – then they are placed in a MAC table.

• If no frames are seen with a previously learned address, the MAC address entry is automatically discarded or aged out after 300 seconds.




Static MAC addresses• If entered by an admin, it will be permanent and not age out or be cleared out by powering down the switch.

• The node has to be attached to the switch.




Port Security• Anyone can plug in if they are in the open• Port security can be set on an interface – so that,

for instance, the number of MAC addresses that can be learned on any one interface could be 1.

• Port security can be verified with:Show port security

Note commands available




Adding a Switch




MAC Addresses




Password Recovery

On a Cisco Catalyst 2900, hold down the MODE button during switch startup to begin the process.

Instructions attached for Password Recovery on a Cisco 1900 Catalyst Switch.



Chapter 6 – Switch Configuration

Module 6Switch Configuration

END

20088 1 ccna3 3.1-06 switch configurations

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