130 | DHCPw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Table 8-6. Messages Exchanged between a DHCP Client and ServerConfiguring the Switch as a DHCP ServerImportant Points to Remember• The S-Series supports a maximum of 16 pools. If you attempt to configure more than 16 pools, theswitch prints the following error message:Could not create DHCP pool.• Up to 256 leases can be offered.• To create a partial scope, use the ip dhcp excluded-address ip address command.• When configuring VLANs, SFTOS automatically matches the requests coming from a particularsubnet to the pool with that subnet and assigns an IP address accordingly. For example, it willrecognize that a request has been received from a host on VLAN 10, which is using addresses on the10.10.10.0 network, and automatically assign it an address from the 10.10.10.0 pool.Configuration Task List• Configuring a DHCP address pool (required) on page 131• Excluding IP addresses (optional) on page 131• Enabling the SFTOS DHCP Server feature (required) on page 131Reference Message Use0x01 DHCPDISCOVER The client is looking for available DHCP servers.0x02 DHCPOFFER The server response to the client’s DHCPDISCOVER message.0x03 DHCPREQUEST The client broadcasts to the server, requesting offered parameters from one serverspecifically, as defined in the packet.0x04 DHCPDECLINE The client-to-server communication, indicating that the network address is already inuse.0x05 DHCPACK The server-to-client communication with configuration parameters, includingcommitted network address.0x06 DHCPNAK The server-to-client communication, refusing the request for configuration parameter.0x07 DHCPRELEASE The client-to-server communication, relinquishing network address and cancelingremaining leases.0x08 DHCPINFORM The client-to-server communication, asking for only local configuration parametersthat the client already has externally configured as an address.
