Dell S4048T, Configuration Manual

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• Dell Networking OS provides 40000 entries that can be divided between leased addresses and excluded
addresses. By extension, the maximum number of pools you can configure depends on the subnet mask
that you give to each pool. For example, if all pools were configured for a /24 mask, the total would be
40000/253 (approximately 158). If the subnet is increased, more pools can be configured. The
maximum subnet that can be configured for a single pool is /17. Dell Networking OS displays an error
message for configurations that exceed the allocated memory.
• 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 25. 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.
Dynamic Host Configuration Protocol (DHCP) 347