Users Guide

• This platform supports 4000 DHCP Snooping entries.
• All platforms support Dynamic ARP Inspection on 16 VLANs per system. For more information, refer to Dynamic ARP Inspection.
NOTE: If the DHCP server is on the top of rack (ToR) and the VLTi (ICL) is down due to a failed link, when a VLT
node is rebooted in BMP (Bare Metal Provisioning) mode, it is not able to reach the DHCP server, resulting in BMP
failure.
Configure the System to be a DHCP Server
A DHCP server is a network device that has been programmed to provide network configuration parameters to clients upon request.
Servers typically serve many clients, making host management much more organized and efficient.
The following table lists the key responsibilities of DHCP servers.
Table 23. DHCP Server Responsibilities
DHCP Server Responsibilities Description
Address Storage and Management DHCP servers are the owners of the addresses used by DHCP
clients.The server stores the addresses and manages their use,
keeping track of which addresses have been allocated and which
are still available.
Configuration Parameter Storage and Management DHCP servers also store and maintain other parameters that are
sent to clients when requested. These parameters specify in detail
how a client is to operate.
Lease Management DHCP servers use leases to allocate addresses to clients for a
limited time. The DHCP server maintains information about each of
the leases, including lease length.
Responding To Client Requests DHCP servers respond to different types of requests from clients,
primarily, granting, renewing, and terminating leases.
Providing Administration Services DHCP servers include functionality that allows an administrator to
implement policies that govern how DHCP performs its other
tasks.
Configuring the Server for Automatic Address Allocation
Automatic address allocation is an address assignment method by which the DHCP server leases an IP address to a client from a pool of
available addresses.
An address pool is a range of IP addresses that the DHCP server may assign. The subnet number indexes the address pools.
To create an address pool, follow these steps.
1. Access the DHCP server CLI context.
CONFIGURATION mode
ip dhcp server
2. Create an address pool and give it a name.
DHCP mode
pool name
3. Specify the range of IP addresses from which the DHCP server may assign addresses.
DHCP <POOL> mode
network network/prefix-length
• network: the subnet address.
• prefix-length: specifies the number of bits used for the network portion of the address you specify.
The prefix-length range is from 17 to 31.
4. Display the current pool configuration.
DHCP <POOL> mode
250
Dynamic Host Configuration Protocol (DHCP)