Cisco Switch Basics

Li-Wei

Outline

Connection to a Switch
Command Line Modes
Command Line Basics
Show
Configuration Mode
Exercise

Connection to a Switch

Console Port (Serial RS232, USB)

VTY (Telnet, SSH)
HTTP, HTTPS

Command Line Modes

User Mode

Privileged Mode

Configuration Mode

Switch>

Switch>enable
Switch#

Switch#configure terminal
Switch(config)#exit
Switch#

Command Line Basics

Autocomplete: <TAB>

Switch#show ru<TAB>
Switch#show running-config

List Available Commands: ?

Switch#show r?
radius          redundancy  region     registry
reload          rep         resource   rhosts
rib             rif         rmon       rom-monitor
romvar          route-map   route-tag  rpl
running-config

Switch(config)#?
Configure commands:
  aaa                         Authentication, Authorization and Accounting.
  access-list                 Add an access list entry
  access-session              Access Sesion Global Configuration Commands
  alias                       Create command alias
  ancp                        Configure ANCP
  archive                     Archive the configuration
  arp                         Set a static ARP entry
...

Command Line Basics

Interface Numbers

```
FastEthernet0/1 or Fa0/1
```
```
GigabitEthernet1/0/2 or Gi1/0/2
```
```
TenGigabitEthernet1/0/3 or Te1/0/3
```
```
Port-channel1 or Po1
```
```
Vlan543 or Vl543
```

Command Line Basics

Output Modifier: |
- ```
<command> | include <expr>
```
  - output lines that include <expr>
- ```
<command> | exclude <expr>
```
  - output lines without <expr>
- ```
<command> | begin <expr>
```
  - output begins from the first line that includes <expr>

Switch#show arp | include 140.112.30.34
Internet  140.112.30.34  102  98f2.b3ee.bb4e  ARPA  Vlan30

Note: spaces around "|" cannot be omitted!

Show

show running-config : running configuration

show interfaces : detail of all interfaces

show interfaces Fa0/1 : detail of a specified interface

show interfaces status : interface status

```
show vlan : VLANs in VLAN database
```

show mac address-table : MAC address/port mapping

```
show arp : ARP table
```

show version : hardware/software infomation

```
show ?
```

Configuration Mode

Switch#configure terminal
Switch(config)#

Global Configurations

```
hostname <name>
```
```
enable password / enable secret
```

Switch(config)#enable password PASSWORD
Switch(config)#enable secret 0 PASSWORD
Switch(config)#do show running-config | include enable
enable password PASSWORD
enable secret 5 $1$mERr$cP1uxB/ASHbnPQTLzT8H10

```
service password-encryption
```

Switch(config)#enable password PASSWORD
Switch(config)#service password-encryption
Switch(config)#do show running-config | include enable
enable password 7 08116D7D3A2E2A2536

```
no <command>
```

: set hostname

: set enable password

: enable password encryption feature

: negates a command

Interface Configurations

choose interface:

Switch(config)#interface FastEthernet0/1
Switch(config-if)#

set port access VLAN:

Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 543

set port as a trunk port:

Switch(config-if)#switchport mode trunk
Switch(config-if)#switchport trunk allowed vlan 543,544

set IP on VLAN interfaces:

Switch(config-if)#ip address 192.168.252.254 255.255.255.0

Interface Configurations

set channel group:

Switch(config-if)#channel-group 1 mode active

choose "port channel" interface:

Switch(config)#interface Port-channel 1
Switch(config-if)#

link aggregation / port channel setup steps:
- create a port channel interface
- make port channel & physical interfaces have the
  same (VLAN, ...) settings
- make physical interfaces have the "channel group" configuration

Line (Console) Configuration

choose line:

enable login:

set password:

Switch(config)#line vty 0 4
Switch(config-line)#

Switch(config-line)#login

Switch(config-line)#password PASSWORD

Save Configuration

Switch#copy running-config startup-config

CRUCIALLY IMPORTANT!!!

Switch#write memory

Method 1:

Method 2:

Exercise

Cisco Packet Tracer

download Cisco Packet Tracer (link)
unzip and execute "bin/PacketTracer7.exe"
download "inclass.pka" & open it with Cisco PT

Goals

make RD-1 & RD-2 under VLAN100
make SP-1 & SP-2 under VLAN200
servers in the same VLAN should be able to ping each other
setup link aggregation between two switches

Note: use "Check results" on the "PT Activity" window to check your goals.

trunk VLAN 100, 200