you configure IP source address validation on a member port of a virtual local area network (VLAN) and then to apply an accesslist to the VLAN, Dell Networking OS displays the first line in the following message. If you first apply an ACL to a VLAN and thenenable IP source address validation on one of its member ports, Dell Networking OS displays the second line in the followingmessage.% Error: Vlan member has access-list configured.% Error: Vlan has an access-list configured.NOTE: If you enable DHCP Snooping globally and you have any configured L2 ports, any IP ACL, MAC ACL, or DHCPsource address validation ACL does not block DHCP packets.• Dell Networking OS provides 40000 entries that can be divided between leased addresses and excluded addresses. Byextension, the maximum number of pools you can configure depends on the subnet mask that you give to each pool. Forexample, if all pools were configured for a /24 mask, the total would be 40000/253 (approximately 158). If the subnet isincreased, more pools can be configured. The maximum subnet that can be configured for a single pool is /17. Dell NetworkingOS 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 nodeis 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 ServerA 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 ResponsibilitiesDHCP Server Responsibilities DescriptionAddress Storage and Management DHCP servers are the owners of the addresses used by DHCPclients.The server stores the addresses and manages their use,keeping track of which addresses have been allocated and whichare still available.Configuration Parameter Storage and Management DHCP servers also store and maintain other parameters that aresent to clients when requested. These parameters specify indetail how a client is to operate.Lease Management DHCP servers use leases to allocate addresses to clients for alimited time. The DHCP server maintains information about eachof the leases, including lease length.Responding To Client Requests DHCP servers respond to different types of requests fromclients, primarily, granting, renewing, and terminating leases.Providing Administration Services DHCP servers include functionality that allows an administratorto implement policies that govern how DHCP performs its othertasks.Configuring the Server for Automatic Address AllocationAutomatic address allocation is an address assignment method by which the DHCP server leases an IP address to a client from apool 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 mode284 Dynamic Host Configuration Protocol (DHCP)
