PXE and DHCP Snooping

[Andreas Bärwald]

We have a implimentation auf 4204 at the Backbone and 2610 onn the Edge.

The Clients make a PXE and when we configured dhcp-snooping on the switches it doesnt work. The DHCP Server is a Windows 2003 R2.

We configured the trusted ports for the DHCP Server himself and the Uplinkports to the edges. On every Switch we have configured the authorized Server (DHCP) and the trusted ports. Set dhcp-snooping globally and for the Vlan 1 the default vlan.

It don't works !

What means option 82 on the switch? Modify the source Adress right?? Are there any modifications on the DHCP necessary? Must option 82 be enabled at the switch?

DHCP Server 192.168.25.1 Clients becomme an IP Adress at the 25 Subnet. The Switch is at 192.168.26.x

Hope for help !

Best regards

Andreas

[cenk sasmaztin · Accepted solution]

hi Andreas please send me sh run print your core switch and one edge switch

[Raymon van der Meijden]

I had the same problem with DHCP on a Cisco 1841.

I tried
no dhcp-snooping option 82

And this helped.

[Andreas Bärwald]

Hello,

here the configs. I have testet ist with check uand uncheck option 82

We testet ist for VLAN 1 192.168.25.1


Best regards

Andreas

[Andreas Bärwald]

Here the message during the boot

PXE-E55: ProxyDHCP service did not reply on to request on Port 4011


Andreas

[Roar Pettersen_1]

Have you tried :

no dhcp-relay