arp inspections

From: Kal Han (calikali2006@gmail.com)
Date: Wed Dec 13 2006 - 16:25:49 ART

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Hi
on a catalys switch, since arp inspections look into the
dhcp bindings to verify ip - mac bindings,

----->in dhcp environments,

1) should I enable ip dhcp globally or *also* on vlans of my interest.

Example,. if I want to do arp inspections in vlan 5

should I enable ip dhcp snooping vlan 5 ??
or just a global ip dhcp snooping is sufficient ?

im not very clear on using* just the "ip dhcp snooping"* command
what exactly will it do when I dont enable per vlan dhcp snooping ?
does it have any effect with out enabling snooping on vlan basis ?

Thanks
Kal

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