Single Server serving Multiple VLANs
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Each DHCP-enabled VLAN interface initiates DHCPDISCOVER message, receives DHCPOFFER from the server, and send DHCPREQUEST to obtain the offered parameters.
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If multiple interfaces send DHCPREQUESTs, it is possible that more than one DHCPACK is returned with a valid Option 66.
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Evaluating and updating the configuration file occurs only on the primary VLAN.
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Option 66 is ignored by any interfaces not belonging to the primary VLAN.
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Multiple Servers serving a Single VLAN
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Each DHCP-enabled VLAN interface initiates one DHCPDISCOVER and receives one or more DHCPOFFER messages.
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Each interface accepts the best offer.
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Option 66 is processed only for the interface belonging to the primary VLAN.
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Multiple Servers serving Multiple VLANs
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Each DHSP-enabled VLAN interface initiates DHCPDISCOVER and receives one or more DHCPOFFER messages.
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Each interface accepts the best offer.
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Option 66 is processed only for the interface belonging to the primary VLAN.
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Multi-homed Server serving Multiple VLANs
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The switch perceives the multi-homed server as multiple separate servers.
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Each DHCP-enabled VLAN interface initiates DHCPDISCOVER and receives one DHCPOFFER message.
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Each interface accepts the offer.
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Option 66 is processed only for the interface belonging to the primary VLAN.
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