How to connect two DHCP servers within cisco switch 3550 10 gigabit ports?
I have two DHCP servers with different subnet connect to the same cisco switch 3550 with 10 gigabit ports. Port # 2 connect to DHCP server1, Port # 3 connect to DHCP server2 and Port # 3 connect to dhcp client zone. Is it impossible to work out? If yes, please tell me on how to do it!
Thanks so much in advance! 
Tagged with: 10 gigabit • cisco • cisco switch • client zone • dhcp servers • gigabit ports • google • script type • server2 • subnet • text javascript
Filed under: Business Phone Systems
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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 <default gateway of the scope of DHCP server 1>
ip helper-address <IP of your DHCP>
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 <default gateway of the scope of DHCP server 1>
no shut
int vlan 20
ipadd <default gateway of the scope of DHCP server 2>
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.