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1. 1
Switch Configuration

2. 2
Switches
• Contain:
–CPU
–RAM
–Operating System

3. 3
LED
Indicators
Default
setting

4. 4
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.

5. 5
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 ?

6. 6
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.

7. 7
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.

8. 8
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

9. 9
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.

10. 10
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.

11. 11
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.

12. 12
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.

13. 13
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

14. 14
Adding a Switch

15. 15
MAC Addresses