dhcp snoop

From: dampened (cheechew@hotmail.com)
Date: Wed Dec 20 2006 - 07:40:46 ART

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I have topology where there are 2 switches, upstream and downstream. The
DHCP server is on vlan 2 and client on vlan 3. Both switch are connected by
trunk.
Here is the skeleton of the config.

When ip put "ip dhcp snooping vlan 3" on switch 2, the client could not get
IP from DHCP. When I removed it, everything is fine, the binding is properly
built on switch 1. But without the snooping on switch 2, the feature
actually is not yet configured. Whats wrong with my config?

switch-1:

ip dhcp snooping
ip dhcp snooping vlan 3

interface f0/1
 description connect to DHCP server
 switchport access vlan 2
 switchport mode access
 ip dhcp snooping trust

interface f0/24
 description trunk to switch 2

interface vlan 2
 ip address ...

interface vlan 3
 ip address ...
 ip helper-address dhcp_server

switch-2:

ip dhcp snooping
ip dhcp snooping vlan 3 <-----------------------------

interface f0/1
 description connect to DHCP client
 switchport access vlan 3
 switchport mode access

interface f0/24
 description trunk to switch 1
 ip dhcp snooping trust

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