MS DHCP Server with Multiple VLans on Cisco Router

MS DHCP Server in a VLAN Environment

1.use multiscpoe option in MS DHCP Server.
2.Create scopes on the dhcp server with address pools like "192.168.1.0/24 ,192.168.2.0/24,....for each vlan.
3.create vlan interfaces on the router for each vlan, assign ip addresses and masks to the interfaces according to your DHCP scopes.
4.configre "ip healper address" on the router/L3 switch.
5. you are done.

Configuring DHCP/BootP relay agent on Cisco Router

Configuring a Router to forward DHCP/BootP is very simple. Configure an IP helper-address pointing to the DHCP/BootP Server, or pointing to the subnet broadcast address of the network the server is on.

To forward the BootP/DHCP request from the client to the DHCP server, the ip helper-address interface command is used. The IP helper-address can be configured to forward any UDP broadcast based on UDP port number.

For Example:

interface Ethernet0
ip address 192.168.2.1 255.255.255.0
no ip directed-broadcast
!
interface Ethernet1
ip address 192.168.1.1 255.255.255.0
ip helper-address 192.168.2.2 
ip helper-address 192.168.2.3 

!--- IP helper-address pointing to DHCP server
===============================================

Reference from cisco and techrepublic website.

Cisco Router Reset Password

To reset the password. Please to do so following procedure

Attach a terminal or PC with terminal emulation to the console port of the router.

Use these terminal settings:

9600 baud rate

No parity

8 data bits

1 stop bit

No flow control

(Note: If you can't enter to recovery mode, take out the WIC if you inserted in Router.)
Press Break on the terminal keyboard within 60 seconds of power up in order to put the router into ROMMON.

If the break sequence does not work, refer to Standard Break Key Sequence Combinations During Password Recovery for other key combinations.

Type confreg 0×2142 at the rommon 1> prompt in order to boot from Flash.

This step bypasses the startup configuration where the passwords are stored.

Type reset at the rommon 2> prompt.

The router reboots, but ignores the saved configuration.

Type no after each setup question, or press Ctrl-C in order to skip the initial setup procedure.

Type enable at the Router> prompt.

You are in enable mode and should see the Router# prompt.

Type configure memory or copy startup-config running-config in order to copy the nonvolatile RAM (NVRAM) into memory.

Important: Do not type copy running-config startup-config or write. These commands erase your startup configuration.

Type show running-config.

The show running-config command shows the configuration of the router. In this configuration, the shutdown command appears under all interfaces, which indicates all interfaces are currently shut down. In addition, the passwords (enable password, enable secret, vty, console passwords) are in either an encrypted or unencrypted format. You can reuse unencrypted passwords. You must change encrypted passwords to a new password.

Type configure terminal.

The hostname(config)# prompt appears.

Type enable secret <password> in order to change the enable secret password. For example:

hostname(config)#enable secret cisco

Issue the no shutdown command on every interface that you use.

If you issue a show ip interface brief command, every interface that you want to use should display up up.

Type config-register . Where configuration_register_setting is either the value you recorded in step 2 or 0×2102 . For example:

hostname(config)#config-register 0×2102

Press Ctrl-z or end in order to leave the configuration mode.

The hostname# prompt appears.

Type write memory or copy running-config startup-config in order to commit the changes.

Hope to help

Reference by http://blog.yucas.info/2008/03/11/cisco-1841-password-recovery/