Are you running IOS DHCP server on the switch? If so, option 82 is not supported. If not, and you want to enable DHCP snooping, support depends on the switch platform in question. What type of switches are you dealing with?
I running IOS DHCP server on the switch 1. And I need that switch 2 can insert port information to DHCP packet as option 82.
What you mean when you said " If so, option 82 is not supported" ? Do you mean switch doesn't support option 82 if it is running IOS DHCP server. And switch DO support option 82 if it is NOT running IOS DHCP server.
Switch 1 is 4510 with SUP V, switch 2 is 3750 or 2950.
The switch supports option 82 insertion, however IOS DHCP server does not support this, so the DHCP server process will not know how to properly interpret the DHCP packets with the option 82 insertion. Does that make more sense?
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