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Understanding in detail about DHCP-based auto-configuration

DHCP provides information about the configuration to interworking devices and Internet hosts. This particular protocol consists of two different components which include a specific mechanism that is primarily for allocating network addresses to the device, and the other one is delivering parameters of configuration to a device from a DHCP server.

DHCP is technically built on a client-server model in Cisco Catalyst WS-C2960CX-8PC-L switches where selected DHCP server configuration parameters and locate network addresses to the devices that are dynamically configured. The switch over here cannot only act as a DHCP server but also as a DHCP client.

Your switch on the Cisco DHCP client automatically configures at the startup with a configuration file and an IP address information. This happens during the DHCP-based auto-configuration. You don’t need any DHCP client-side configuration on your switch when you have the DHCP-based auto-configuration. But this is not the same case when you need to configure the DHCP service for different other lease options that are associated with IP addresses. But suppose you are using the DHCP any kind of configuration file location on the network. In that case, you also require to configure a Cisco Domain name system server (DNS) and a Cisco Trivial file transfer protocol server (TFTP).

Same LAN or on a different LAN

The DHCP server for your switch can either be on a different LAN or the same LAN than the switch. But suppose the DHCP server is running on a different LAN the switch then all you need to do is to configure a DHCP relay device between the DHCP server and your switch. Relay device is used when there is a need for forwarding broadcast traffic between two LANs that are directly connected. Most users and customers of the mistake one thing about the DHCP server on the Cisco catalyst 2960 series is at the router forward broadcast packets. This particular piece of information is not right because it only helps to forward packets that are based upon the destination IP address, which is present in the received packet.

Lastly, the BOOTP client functionality on your Cisco Catalyst 2960 switches is replaced by the DHCP-based autoconfiguration.

The DHCP client request

It’s important to understand that when you put off your switch the DHCP requests configuration information because it is invoked from the DHCP server when the configuration file is not available on the switch. Suppose the configuration file is not available on the switch and top of this. In that case, the configuration also includes the IP address DHCP interface configuration commands that is on precise and particular rooted interfaces then that the DHCP client is appealed or otherwise requested to give the Ip information for all of those interfaces.

The process of how all of this happens is mentioned below:

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