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DHCP snooping
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Author:  donglee [ Sun Mar 23, 2014 12:20 pm ]
Post subject:  DHCP snooping

hello guys,

i've got:

- Cisco Catalyst 3750 with some SVIs - Vlan10 and Vlan20;

- MS DHCP server on Vlan10 and ip helper-address on Vlan20 SVI;

- DHCP Snooping with Trusted ports;

everything work just fine...

problem:

i've got another WS-C3750X-48T-L;

- created Vlan30 and related SVI with ip helper-address;

now, the 3750 which contains DHCP server is dropping DHCP replies to the 3750 which contains Vlan30 SVI and DHCP clients within. all necessary trunks and DHCP Server are Trusted.

DHCP Snooping configuration:

#ip dhcp snooping vlan 10-30

#no ip dhcp snooping information option

#ip dhcp snooping

i believe it has something to do with option82 but can't find what exactly..

would appreciate any help.

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