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Posted by SIMON WATSON on April 4, 2008, 5:29 am
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> Simon,
>
> Check for "DHCP Snooping" on both switches. Basically, just do a "show run
> | inc dhcp". If you have DHCP Snooping implemented, configure uplink as a
> "trusted port".
>
> Good luck,
>
> Mike
> CCNP, CCDP, CCSP, Cisco Voice, MCSE W2K, MCSE+I, Security+, etc.
> CCIE R&S (in progress), CCIE Voice (in progress)
> ------
> Headset Adapters for Cisco IP Phones
> www.ciscoheadsetadapter.com
> www.headsetadapter.com
>
>
>> Hi All
>>
>> I need your help
>>
>> We have a dhcp server that was connected to Cisco 2960 which in turn was
>> connected to alcatel switches, all worked fine. we changed the alcatel
>> switches to cisco 2960's. We now have a problem that only devices
>> directly connected to the original 2960(where the dhcp server is
>> connected to) is receiving IP addresses we have now 4 other 2960's onthe
>> network but we cannot get a IP address when we connect to any of the
>> ports. doing a sniffer trace on the working switch the DHCP four way
>> handshake is performed, discovery>>offer>>request>>>ack
>>
>> On one of the other switches only the discovery is seen but no offer
>> response from the dhcp server is seen therefore no ip address is
>> received. the new switches only have portfast set and an ip address for
>> vlan1 so I cannot understand what is stopping the dhcp traffic
>>
>> Any Ideas
>>
>> Thanks
>>
>> Simon
>>
>
>
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