Have question about DHCP snooping, wanted to enable this feature to our LAN. here is below our LAN infrastructure:
2x 6500 as core switches L2/L3
2x6500 as access switches for server farms L2
50x3750 as access switches for users
All access switches are connected to the both 6500 core switches with redundant links
As I understood I have to enable first ip dhcp snooping to all those switches even on the core switches. And all access switches 6500 and 3750
After that I have to enable ip dhcp snooping trust to every uplinks
And finally have to enable ip dhcp snooping on the specific vlans that I want this feature.
So my question is:
Why have I to enable ip dhcp snooping to the four 6500 switches, if I enable ip dhcp snooping to only 3750 access switches for users and trust all uplink to the core switches, why this features doesn’t works ?
I probably missed some thing but I cannot find the answer on the Cisco site.
So thanks in advance for your help.