162 | Dynamic Host Configuration Protocol (DHCP)w w w . d e l l . c o m | s u p p o r t . d e l l . c o mImplementation Information• The Dell Force10 implementation of DHCP is based on RFC 2131 and RFC 3046.• IP source address validation is a sub-feature of DHCP snooping; FTOS uses ACLs internally toimplement this feature and as such, you cannot apply ACLs to an interface which has IP source addressvalidation. If you configure IP source address validation on a member port of a VLAN, and thenattempt to apply a access list to the VLAN, FTOS displays the first line in Message 1. If you first applyan ACL to a VLAN, and then attempt enable IP source address validation an one of its member ports,FTOS displays the second line in Message 1.• FTOS provides 40K entries that you can divide between leased addresses and excluded addresses. Byextension, the maximum number of pools you can configure depends on the on the subnet mask thatyou give to each pool. FTOS displays an error message for configurations that exceed the allocatedmemory.• Supports 4K DHCP snooping entries.• Supports DAI on 16 VLANs per system.Configuration Tasks• Configure the System to be a DHCP Server• Configure the System to be a Relay Agent• Configure Secure DHCPConfigure the System to be a DHCP ServerA DHCP server is a network device that has been programmed to provide network configurationparameters to clients upon request. Servers typically serve many clients, making host management muchmore organized and efficient.The key responsibilities of DHCP servers are:1. Address 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 havebeen allocated and which are still available.2. Configuration parameter storage and management: DHCP servers also store and maintain otherparameters that are sent to clients when requested. These parameters specify in detail how a client is tooperate.Message 1 DHCP Snooping with VLAN ACL Compatibility Error% Error: Vlan member has access-list configured.% Error: Vlan has an access-list configured.
