1

Switch Configuration

2

Switches

• Contain:–CPU

–RAM

–Operating System

3

LED Indicators

Default setting

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

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

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

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

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

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

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

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

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

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

Adding a Switch

15

MAC Addresses