HOW TO CONNECT TWO DHCP SERVERS WITHIN CISCO SWITCH 3550 10 GIGABIT PORTS?
November 25th, 2009
I have dual DHCP servers with opposite subnet bond to the same cisco switch 3550 with 10 gigabit ports. Port # 2 bond to DHCP server1, Port # 3 bond to DHCP server2 and Port # 3 bond to dhcp customer zone. Is it unfit to work out? If yes, greatfully discuss it me on how to do it!
Thanks so most in advance! 
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Categories: Cisco hardware
This is pretty good answer. Despite the fact that yahoo answers does not give credit for users who add the additional info for good answers I will help anyway.
You may need to add
int vlan 10
ipadd
ip helper-address
if you do not have it on the router.
And a little bit explanation from Cisco doc:
ip helper-address
To enable the forwarding of User Datagram Protocol (UDP) broadcasts, including BOOTP, received on an interface, use the ip helper-address command in interface configuration mode. To disable the forwarding of broadcast packets to specific addresses, use the no form of this command.
ip helper-address [vrf name | global] address [redundancy vrg-name]
First off, if someone has sold you a 3550 telling you it is a 10G switch, you have been had.
Beyond that, we need to know a little more about what you are trying to do.
The simple option is something like
int fas 0/1
des DHCP server 1
switch mode acce
switch acce vlan 10
no shut
int fas 0/2
des DHCP server 2
switch mode acce
switch acce vlan 20
no shut
int fas 0/3
des user to get address from DHCP server 1
switch mode acce
switch acce vlan 10
no shut
int fas 0/4
des user to get address from DHCP server 2
switch mode acce
switch acce vlan 20
no shut
ip routing
int vlan 10
ipadd
no shut
int vlan 20
ipadd
These last two can be repeated as you wish to allocate users to DHCP servers.
This will allow the users on both VLANs too contact each other.