dhcp stopped working through C4506

Unanswered Question
Oct 17th, 2007
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users unable to connect to lan thru C4506 anymore.


no network / switchport changes made


switchports set to following:

spanningtree portfast

switchport mode access

vlan 1 is being used as default vlan


can ping dhcp server and rest of network


when users boot PC, they hang until network cable is unplugged. once they've logged in (cached credentials), network cable can be plugged back in and they work fine


issue is with this switch ONLY.....dhcp server shows no errors / events. all other users on other switches connected to same network have NO issues.


IOS: 12.2.18(EW) --- i know.....OLD. dont know if THIS would cause SUDDEN problem.


thx for any info.

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Edison Ortiz Wed, 10/17/2007 - 20:08
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Have you tried reloading the switch ?

Kevin Dorrell Thu, 10/18/2007 - 00:56
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Are you using dot1x?


Are you running DHCP snooping or ARP inspection?



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