DHCP resolution

[pankaj_cisco111]

In my network scenario, There are 2 core 6509 switches & 16 2950 L2 switches. Both Cores are connected via HSRP. All server Vlans are directly terminated on 6509 switches & users vlans are terminated via 2950 switches. Inter-vlan routing is enabled between same. Single DHCP server is implemented there for assigning Ip address of all users only. Servers are using static IP addresses. Currently I define helper-address on Core switch to obtain address from DHCP. Pls suggest instead of defining helper-address on 6509 switches, is any other way to get IP addresses from DHCP?

[thisisshanky]

When your DHCP server is in one vlan, and there are multiple vlans, you cannot pass DHCP traffic from vlan to vlan, without configuring a DHCP relay agent (which is what Ip helper-address is).

An alternate solution is to configure DHCP on the 6509 core switches using Cisco IOS DHCP server. This will avoid use of ip helper.

[mehrdad]

as you're using, I think the helper address facility would be the good solution for using DHCP server when we've multiple VLANs with dynamic ip assignment strategy.

you can confine helper address by below syntax command :

ip forward-protocol {udp|nd|spanning-tree} [port]

for example :

ip helper-address 192.168.x.x

ip forward-protocol udp