CCNA3 Chapter 6 - Switch ConfigurationCISCO NETWORKING ACADEMY PROGRAM
Chapter 6 – Switch Configuration
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Switch Overview
Green System is operating normally.
Amber System is receiving power but
is not functioning properly.
POST
indicates status
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Status LED Overview
Individual Port status above each port
CCNA3: Switching Basics and Intermediate Routing v3.1
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Port Status 1
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Port Status 2
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User Mode Commands
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Switch Management
Give switch IP address on management VLAN 1
Switch(config)#interface vlan 1
Use web-browser based management
Switch(config)#ip http server
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Switch Configuration 1
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Switch Configuration 2 - Security
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Switches
Contain:
CPU
RAM
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LED Indicators
Default setting
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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.
CCNA3: Switching Basics and Intermediate Routing v3.1
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Catalyst IOS Intro
enable command.
configure command – go to global config mode.
copy run start – to save config to NVRAM.
Host Name configuration -1-255 characters
hostname [name]
description [description-string] - interface config. mode
Use quotes when using spaces in string.
IOS-based: same as on a router.
access help by entering ?
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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.
CCNA3: Switching Basics and Intermediate Routing v3.1
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Actual Configuration
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.
CCNA3: Switching Basics and Intermediate Routing v3.1
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Remote Access to Switch
Enter an IP address and management VLAN.
Configuration
CCNA3: Switching Basics and Intermediate Routing v3.1
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Defining port speed / duplex
Interface config mode:
CCNA3: Switching Basics and Intermediate Routing v3.1
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Backup on TFTP Server
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.
CCNA3: Switching Basics and Intermediate Routing v3.1
CISCO NETWORKING ACADEMY PROGRAM
VLAN Configuration
Deleting VLAN database
Switch#delete flash:vlan.dat
Switch(config)#interface FastEthernet 0/12
Verify VLAN Configuration
Switch#show vlan
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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.
CCNA3: Switching Basics and Intermediate Routing v3.1
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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.
CCNA3: Switching Basics and Intermediate Routing v3.1
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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
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Adding a Switch
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MAC Addresses
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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.
CCNA3: Switching Basics and Intermediate Routing v3.0
CISCO NETWORKING ACADEMY PROGRAM
Chapter 6 – Switch Configuration