Is it possible to use a Cisco 2950 switch as a DHCP relay?

Is it possible to use a Cisco 2950 switch as a DHCP relay? If so, how can I? I've configured a C172x router but the switch seems different.

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You can do it. You need enhanced image on your switch for it to offer DHCP functionality. Use the following commands (available with Cisco 2950 documentation) for configuring the same:

Commands for DHCP functionality

configure terminal To enter global configuration mode.
ip dhcp snooping To enable DHCP snooping globally.
ip dhcp snooping vlan vlan-id [vlan-id] To enable DHCP snooping on a VLAN or range of VLANs. You can specify a single VLAN identified by VLAN ID.
ip dhcp snooping information option To enable the switch to insert and remove DHCP relay information (option-82 field) in forwarded DHCP request messages to the DHCP server. This is enabled by default.
interface [interface-id] To enter interface configuration mode, and specify the interface to be configured.
ip dhcp snooping trust This is an optional command. It configures the interface as trusted or un-trusted. The default is un-trusted.
ip dhcp snooping limit rate [rate] This is an optional command. It configures the number of DHCP packets per second than an interface can receive. The range you can specify for [rate] is 1 to 4294967294. The default is no rate limit configured.

[ ] expects arguments to be given like VLAN-ID or rate limit. The first five commands should be enough to configure DHCP relay. The other two give the functionality more granularities.

This was first published in October 2006

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