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Webcast-Catalyst9k
New Member

DHCP between VLANs on CISCO4000

Hi,

I have a DHCP server on one VLAN, but the client in other VLANs could not reach the DHCP server. What must i do/enable on the Cisco 4000 for the rest of my clients to obtain the IP Address? Is it DHCP snooping?

Thanks

3 REPLIES
New Member

Re: DHCP between VLANs on CISCO4000

Hi,

Your DHCP server should be reachable by the other VLAN. Hence you need to do some routing on L3. Then you can configure helper-address in vlan interface mode. Your client on the second vlan would get the address via the dhcp server.

Thanks.

New Member

Re: DHCP between VLANs on CISCO4000

Yes, my DHCP server is reachable by the other VLAN. So how am i going to configure the relay? need some guide for the commands here... i would like to configure it in such a way only some VLAN can get the address via the DHCP server... possible? Thanks

New Member

Re: DHCP between VLANs on CISCO4000

Add the following commands

!The following command should be in global config mode

!This is to make sure that bootp service is enabled

!

(config)#ip bootp server

!The following command should be applied to the interface/subinterface

!on the vlan containing the clients. x.x.x.x is the dhcp server ip address

!

(config-if)#ip helper-address x.x.x.x

Make sure that the scope is defined on the dhcp server (including the default gateway -- option "003 Router" on the Microsoft DHCP server).

As far as other vlans, they will not be able to use the DHCP server until the "ip helper-address" is defined on the router AND the DHCP server has a scope defined for that vlan WITH the default gateway defined.

Regards,

Pritish

pritish@yahoo.com

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