Re: DHCP Problem

From: Darby Weaver <ccie.weaver_at_gmail.com>
Date: Fri, 24 Apr 2009 00:09:31 -0400

Well all points are valid.

You can always perform a debug on dhcp and see what is happening.

Is the server giving out ip addresses? Or is it not?

If you configure device - say your PC or Laptop and configure it for DHCP -
what happened?

- APIPA?
- IP Address (Which IP address).

You can have the IP Helper Address on VLAN where the DHCP Server is local -
however it does not accomlish anything for that vlan - since the DHCP
Request is an Brodcast in the first place and will make it the DHCP Server.

Just a check...

conf t

service dhcp

Is it enabled or disabled?

===========

Some commands that will help:

Switch#sh ip
*Mar 1 04:57:51.358: %SYS-5-CONFIG_I: Configured from console by console
dhcp ?
  binding DHCP address bindings
  conflict DHCP address conflicts
  database DHCP database agents
  import Show Imported Parameters
  limit DHCP limit
  pool DHCP pools information
  relay Miscellaneous DHCP relay information
  server Miscellaneous DHCP server information
  snooping DHCP snooping
  vrf DHCP vrf information
Switch#sh ip dhcp bind
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
                    Hardware address/
                    User name
Switch#sh ip dhcp database
Switch#sh ip dhcp conflict
IP address Detection method Detection time VRF
Switch#

Now I did not see where you disabled conflict logging...

Nor did I hear you mention defining another location to store the database.

You did not supply any debugs to help give some clarity to the scenario.

Hmm....

The Voice VLAN works pretty good configured under the same interface as the
Data VLAN too.

Now there is an old problem I don't see often but I do see.

It has to do with the oder of operations performed when creating a vlan in
the first place.

And the solution is quick - but you said you can ping the vlan and so I'd
have to rule that one out.

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Received on Fri Apr 24 2009 - 00:09:31 ART

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