Please correct me if I'm wrong but the way I've seen it work is; If you have
the helper address defined on all the vlans in you RSM then, when the router
sees a bootp dhcp request from the PC it sends a directed broadcast towards
the next hop to the helper address. When it gets to the server the packet
contains the originating subnet and the server then knows what subnet to
give an address from. It then sends a unicast packet back to the originating
router and the router then forwards it to the pc via its MAC address.
In reply to:
Hello folks,
Please clarify this for me. =20
Hypothetical example: Campus LAN with multiple buildings. Each building =
on its own vlan and with its own subnet addressing scheme. All buildings =
tied in to a Catalyst 5500 which has RSP doing all the inter-vlan =
routing. Data center using a single DHCP server with multiple scopes =
(one scope per vlan/subnet etc) to supply all vlans/subnets with their =
respective ip addresses. I want to understand how the DHCP server knows =
how to hand out the correct ip address from the corresponding subnet to =
the workstations that request them. I have come to believe that =
initially DHCP servers have no idea whom is requesting an address, they =
just hand them out to whoever asks...this is what is confusing. I =
understand that each Vlan needs its own gateway address where the =
workstations aim their broadcasts and there an ip helper-address =
statement in the RSP for each vlan, but I still don't understand how the =
DHCP server knows how to hand out the appropriate address when it has =
multiple scopes enabled.
TIA for any clarification you can offer.
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