DHCP configuration on Cisco Router or switch

 

 DHCP configuration on Cisco Router or switch :

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Let's begin to configure basic DHCP on IOS-based router.
May configure through console cable or Ethernet cable, however please plug into correct port and use correct method access into IOS command line console.

To configure Cisco IOS DHCP, follow these steps, which include sample commands:

1. Configure an IP address on the router's Ethernet port, and bring up the interface. (On an existing router, you would have already done this.)
   
Router(config)# interface ethernet0/0 Router(config-if)# ip address 1.1.1.1 255.0.0.0 Router(config-if)# no shutdown
2. Create a DHCP IP address pool for the IP addresses you want to use.
Router(config)# ip dhcp pool mypool
3. Specify the network and subnet for the addresses you want to use from the pool.
Router(dhcp-config)# network 1.1.1.0 255.0.0.0
4. Specify the DNS domain name for the clients.
Router(dhcp-config)#domain-name mydomain.com
5. Specify the primary and secondary DNS servers.
Router(dhcp-config)#dns-server 1.1.1.10 1.1.1.11
6. Specify the default router (i.e., default gateway).
Router(dhcp-config)#default-router 1.1.1.1
7. Specify the lease duration for the addresses you're using from the pool. (i.e: 7days and 12hours / half day)
Router(dhcp-config)#lease 7 Router(dhcp-config)#lease 0 12
8. Exit Pool Configuration Mode.
Router(dhcp-config)#exit

Next, exclude any addresses in the pool range that you don't want to hand out.
For example, let's say that you've decided that all IP addresses up to .100 will be for static IP devices such as servers and printers. All IP addresses above .100 will be available in the pool for DHCP clients.

Here's an example of how to exclude IP addresses .100 and below:
Router(config)#ip dhcp excluded-address 1.1.1.0 1.1.1.100

Then, enter the ipconfig /renew command on the laptop to receive an IP address. After you have the IP address, enter the ipconfig /all command.

This is the sample output:

DHCP configuration on Cisco Router or switch :

 

 

Steps to configure a Cisco router and switch

Steps to configure a Cisco router and switch:

 

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Architecture of a Cisco router  :

The IOS operating:
- Flash memory.
- IOS running in Flash.
- IOS running in RAM.
The startup configuration:
- NVRAM.
- Access and backup.
Operational configuration:
- RAM memory.

Installing and Configuring a Cisco Router :

Preparing the Cisco router
- Setting up connections. Power. Access and configuration of the console. The passage in privileged mode. Identification of the hardware configuration. Identifying versions. Configuration mode.
General configuration commands
- Last time, host name, password ... Minimum configuration. Ethernet interfaces.
View Controls
- Validation Tests. Ping function. Trace function. Types of access to the router via the console via the network
Protection of access configuration
- Encryption of passwords. Implementation of filters Telnet access. Associating commands to a level password. Access Control List

Configuring Cisco Switch :

Principles of the frame switching.
-Configure topology LANs reliable. Spanning-tree algorithm.
Virtual LANs: VLAN
- Principles and criteria for establishing VLANs. Configuration commands. Benefits of switching. Integration of the switches in a network of routers. 

Configure IP routing  :

General
- Creation of an interconnection network. Default routing.
static Routing
- Presentation: advantages and disadvantages. Configuring routing tables. Checks LAN to LAN.
Dynamic Routing RIP V2
- Implementation of routing. Distribution tables. Audits. Management of networks and subnets. Using the debug RIP. Incident handling.
OSPF dynamic routing
- Presentation. Without routing area.
Configuration and implementation of OSPF
- The OSPF metric and the consequences of the choices. Incident Response: convergence. Supervision routing.

Configure a Cisco router for WAN:

- Serial PPP leased line. Configuration of the encapsulation.
- Serial Frame Relay. Configuring the physical interface. Configuring virtual serial interfaces. Flow definition, CIR for each DLCI.
- The PPP and its security mechanisms. CHAP configuration mode.

Tutorial :

Configuration of the serial interfaces PPP, Frame Relay.Mise implement CHAP. Validation and routing of emergency. Test and debug configurations.

Security  :

- Public addresses, private addresses
- Implementation of the function of translation: NAT / PAT.
- Translation static or dynamic.
- Filter access to a given application.
- Access-list extended.

Operate a Cisco router :

- Recovery of the password on the router and switch.
- Erasing configuration: what to do?
- Starting Cisco. The states of the configuration register. Download a new version of software package.
- Backups. Cisco IOS backup via TFTP. Backup configuration on the network. Change outside router configuration. Downloading a new configuration.
- Supervision. Verification software. Change management. Configuration management.

Tutorial :

Backup / reinstall IOS and configuration via the network. Recovery after loss of IOS in Flash. Recovery / replacement password.