Comments on: How to connect two DHCP servers within cisco switch 3550 10 gigabit ports? http://tapitsoftware.com/how-to-connect-two-dhcp-servers-within-cisco-switch-3550-10-gigabit-ports.htm/ Call Accounting And Call Monitoring Software For Your Business Phone Center Sun, 01 Apr 2012 00:40:29 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Lanwanprofessional.com http://tapitsoftware.com/how-to-connect-two-dhcp-servers-within-cisco-switch-3550-10-gigabit-ports.htm/comment-page-1/#comment-8092 Lanwanprofessional.com Tue, 09 Feb 2010 14:35:57 +0000 http://tapitsoftware.com/how-to-connect-two-dhcp-servers-within-cisco-switch-3550-10-gigabit-ports.htm#comment-8092 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] 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]

]]> By: paulhepcat http://tapitsoftware.com/how-to-connect-two-dhcp-servers-within-cisco-switch-3550-10-gigabit-ports.htm/comment-page-1/#comment-8091 paulhepcat Tue, 09 Feb 2010 14:35:57 +0000 http://tapitsoftware.com/how-to-connect-two-dhcp-servers-within-cisco-switch-3550-10-gigabit-ports.htm#comment-8091 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. 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.

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