Cisco Switch Configuration

Basic Configuration on cisco Switch Series

### Set hostname on switch###

SW(config)#hostname SW

### show IP and interface###

SW#show ip int brief

### Set IP on switch###

(IP on switch is set on interface VLAN 1)

SW(config)#int vlan 1
Switch(config-if)#ip address 10.10.10.1 255.255.255.0
Switch(config-if)#description IT Dep
Switch(config-if)#no sh

#### Enable password to telnet on switch#####

(Mean that we enable to login to switch by telnet)

Switch(config)#line vty 0 15
Switch(config-line)#password cisco
Switch(config-line)#login
Switch(config-line)#privilege level 15

#### Enable password to console####

(Mean that we enable to login to switch by console)
R1(config)#line console 0
R1(config-line)#password cisco 
R1(config-line)#login
R1(config-line)#privilege level 15

#### Save configuration####
R1(config)#copy running-config startup-config
Or
R1(config)#write memory
Or
R1(config)#wr

Cisco Router Configuration

Basic configuration on cisco router

#### Show IP and Interface####
R1#show ip interface brief

#### Set Router Hostname####

R1(Config)#hostname R1

####Set Password for Privilege mode####
R1(config)#enable password Your_Pass ##(Clear text password so anyone can see.)

or

R1(config)#enable secret Your_Pass (Encrypt your password)

### To encrypt all your password###

R1(config)# service password-encryption

###Enable password to telnet####

(Mean that we enable to login to router by telnet)

R1(config)#line vty 0 15  #(max users access 16)

R1(config)#password 123

R1(config)#exec-timeout 5 0
R1(config)#privilege level 15  #(Set level for user have right to do sth)
R1(config)#login

#### Enable password to console####

(Mean that we enable to login to router by console)
R1(config)#line console 0
R1(config-line)#password cisco
R1(config-line)#login
R1(config-line)#privilege level 15

##### set IP address on Ethernet interface#####
R1(config)#int f0/1
R1(config-if)#ip address 1.1.1.1 255.255.255.0
R1(config-if)#description LAN
R1(config-if)#no shutdown

##### set IP address on Gigabit interface#####
R1(config)#int gigabitEthernet 0/1
R1(config-if)#ip address 1.1.1.1 255.255.255.0
R1(config-if)#description LAN
R1(config-if)#no shutdown

#### Save configuration####
R1(config)#copy running-config startup-config
Or
R1(config)#write memory
Or
R1(config)#wr

Redundancy on Mikrotik Router

How to configure Redundancy on Mikrotik router

Scenario:
This example will show how to configure a MikroTik Router with a secondary WAN port for failover in the case of redundancy if the primary WAN port goes down.

1. Go to New Terminal and then add IP Primary WAN to Ether1

/ip address add address=1.1.1.1/30 interface=ether1 comment="primary wan" disabled=no

2. Add IP Secondary WAN to Ether2

/ip address add address=2.2.2.2/30 interface=ether2 comment="failover wan" disabled=no

3. Add DNS

/ip dns set allow-remote-requests=yes servers=8.8.8.8,8.8.4.4

4. Add IP Internal 192.168.1.1/24 on Ether3

/ip address add address=192.168.1.1/24 interface=ether3 comment="internal network" disabled=no

5. Configure DHCP for client

/ip dhcp-server setup 
Select interface to run DHCP server on 

dhcp server interface: ether3
Select network for DHCP addresses 

dhcp address space: 192.168.1.0/24
Select gateway for given network 

gateway for dhcp network: 192.168.1.1
Select pool of ip addresses given out by DHCP server 

addresses to give out: 192.168.1.2-192.168.1.254
Select DNS servers 

dns servers: 192.168.1.1
Select lease time 

lease time: 3d

6. Configuring NAT for Internet Access

/ip firewall nat add chain=srcnat action=masquerade comment="nat internet access" disabled=no

7. Setup the default routes and have the router check the main WAN port. If the router does not receive a response then route traffic out the failover WAN port:

/ip route add dst-address=0.0.0.0/0 gateway=1.1.1.1 check-gateway=ping distance=1 disabled=no
/ip route add dst-address=0.0.0.0/0 gateway=2.2.2.2 distance=2 disabled=no

Source

http://blog.gowifi.co.nz/2012/10/mikrotik-dual-gateway-failover.html

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How to configure cisco router 1841

How to configure cisco router 1841 can access to internet

Please See network infrastructure 

I. Configure DHCP

Router>
Router>en
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#ip dhcp pool 192
Router(dhcp-config)#network 192.168.1.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.1.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#exit

II. Apply DNS

Router(config)#ip name-server 118.222.222.222

Router(config)#ip name-server 192.168.100.10

III. Configure Route And Default-Gateway

Router(config)#ip route 0.0.0.0 0.0.0.0 115.31.180.16

Router(config)#ip route 192.168.1.0 255.255.255.0 115.31.180.16

Router(config)#ip default-gateway 115.31.180.16

IV. Apply IP on each interface

Router(config)#int f0/0

Router(config-if)#ip add 115.31.180.2 255.255.255.240

Router(config-if)#no sh

Router(config-if)#ip nat outside

Router(config)#int f0/1

Router(config-if)#ip add 192.168.1.1 255.255.255.0

Router(config-if)#no sh

Router(config-if)#ip nat inside

V. Create Access List (NAT)

Router(config)#access-list 7 permit 192.168.1.0 0.0.0.255

Router(config)#ip nat inside source list 7 interface fastethernet 0/0 overload

Test (For telnet service)

Create User and Login

Router(config)#username phanny privilege 15 secret phanny

Router(config)#line vty 0 4

Router(config-line)#privilege level 15

Router(config-line)#login local

Router(config-line)#exit

So, after you login router will required you to fill in username and password.

But if you use only command Router(config-line)#login when you telnet you will

required only password in line vty (123). Example:

Router(config)#line vty 0 4

Router(config-line)#privilege level 15

Router(config-line)#password 123

Router(config-line)#login 

Router(config-line)#exit

Configure VLAN, DHCP, Trunk Port

Description

In this session you will be able to understand about VLAN, Trunk port, Switchport access, sub-interface and also how to configure on it. Please follow me step by step below.

Purpose

I want create 2 DHCP pool and 2 sub-interface on Router0.
I want create 2 VLAN (100 and 200), Trunk port and switchport access on Switch0
I want create switchport access and trunk on Switch1
I want create switchport access and trunk on Switch1

===> Here is what each device will had configure.
+ On Router0
- Have 2 DHCP Pool
- There are 2 Sub-interface
+ On Switch0
- There are 2 VLAN (100 and 200)
- Trunk Port
+ On Switch1
- Ther are Trunk Port
- Switchport access
+ On Switch2
- Ther are Trunk Port
- Switchport access

Please follow me how to configure on each devices.
******************************On Router0****************************************
=====Configure DHCP 2 pool named 192 and 172==============
Router>
Router>en
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#ip dhcp pool 192
Router(dhcp-config)#network 192.168.1.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.1.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#exit

Router(config)#ip dhcp pool 172
Router(dhcp-config)#network 172.16.1.0 255.255.255.0
Router(dhcp-config)#default-router 172.16.1.1 
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#exit
Router(config)#ip dhcp excluded-address 172.16.1.1 172.16.1.20

=Create 2 Subinterface named 0/0.192 on Gi0/0 and 0/0.172 on Gi0/0=
Router(config)#int gigabitEthernet 0/0.192
Router(config-subif)#encapsulation dot1Q 192
Router(config-subif)#ip address 192.168.1.1 255.255.255.0

Router(config)#int gigabitEthernet 0/0.172
Router(config-subif)#encapsulation dot1Q 172
Router(config-subif)#ip address 172.16.1.1 255.255.255.0

=======No Shutdown int Gi0/0============================
Router(config)#int gigabitEthernet 0/0
Router(config-if)#no sh

******************************On Switch0************************************
===============Configure Trunk on Gi1/1==================
Switch>en
Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#int gigabitEthernet 1/1
Switch(config-if)#switchport mode trunk 
Switch(config-if)#switchport trunk allowed vlan 1-200

Note: If you was typed command switchpot trunk allowed vlan 1-200 it mean that you allowed only VLAN 1 to 200 can access.

=====Configure VLAN===================================
Switch>en
Switch#conf t
Switch(config)#vlan 192
Switch(config-vlan)#name IT
Switch(config-vlan)#exit
Switch(config)#vlan 172
Switch(config-vlan)#name Finance

======Configure int f0/1-f0/12 access vlan 192==============
Switch>en
Switch#conf t
Switch(config)#int range FastEthernet 0/1 - FAstEthernet 0/12
Switch(config-if-range)#switchport mode access
Switch(config-if-range)#switchport access vlan 192

======configure int f0/13 - f0/24 access vlan 172============
Switch>en
Switch#conf t
Switch(config)#int range FastEthernet 0/13 - FAstEthernet 0/24
Switch(config-if-range)#switchport mode access
Switch(config-if-range)#switchport access vlan 172

=======Configure Trunk on port fa0/1======================
Switch>en
Switch#conf t
Switch(config)#int fa0/1
Switch(config-if)#switchport mode trunk

=======Configure Trunk on port fa0/15=====================
Switch>en
Switch#conf t
Switch(config)#int fa0/15
Switch(config-if)#switchport mode trunk

********************************On switch1**********************************

===Configure Trunk on port Gi1/1 and only vlan 172 to 192====
Switch>
Switch>en
Switch#conf t
Switch(config)#int gigabitEthernet 1/1
Switch(config-if)#switchport mode trunk 
Switch(config-if)#switchport trunk allowed vlan 172-192
Switch(config-if)#exit
Switch(config)#

====== Apply all fa0/1 - fa0/12 access vlan 192===========
Switch(config)#int range fastEthernet 0/1 - fastEthernet 0/12
Switch(config-if-range)#switchport mode access 
Switch(config-if-range)#switchport access vlan 192

====== Apply all fa0/13 - fa0/24 access vlan 172==========
Switch(config)#int range fastEthernet 0/13 - fastEthernet 0/24
Switch(config-if-range)#switchport mode access 
Switch(config-if-range)#switchport access vlan 172

****************************On Switch2***********************************
==Configure Trunk on port Gi1/1 and allowed only vlan 172==
Switch>
Switch>en
Switch#conf t
Switch(config)#int gigabitEthernet 1/1
Switch(config-if)#switchport mode trunk 
Switch(config-if)#switchport trunk allowed vlan 172 (If u don't put this command u will allowed all vlan)
Switch(config-if)#exit
Switch(config)#

=======Appy all port can access vlan 172===============
Switch>
Switch>en
Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#int range fa0/1 - fa0/24
Switch(config-if-range)#switchport mode access 
Switch(config-if-range)#switchport access vlan 172