I have upgraded a C3750G-12S-E to c3750-ipserviceslmk9-tar.122-55.SE5
This switch is a distribution layer switch for one of my remote sites. it contains an ip helper-address on the site vlan's SVI.
DHCP relay is no longer functioning for client PCs. Static address assignment allows full network functionality.
I enabled debug ip dhcp server packet
DHCPD: Looking up binding using address [Correct Network Address]
DHCPD: setting giaddr to [Correct Network Address]
DHCPD: BOOTREQUEST from [Client MAC] forwarded to [Correct DHCP Server IP]
DHCPD: option 43 is malformed (option length 0).
DHCPD: invalid DHCP options - unable to parse
I found this: https://supportforums.cisco.com/message/3151175#3151175 containing:
I am using option 43 for LWAPP Discovery and it functions correctly for other sites. The option contains the IP of my WLC(s).
I currenly do not have any LAPs at this site but will be adding them soon so getting rid of Option 43 is not an option. ( LOL )
Your help is much appreciated.
- JK -
I know this is an old post. did you find a solution for this? I had the same problem this week and temporarily removed the Option 43 from DHCP Scope but that is not a solution as I need it for the AP's to join the right WLC.
Issue solved after reading the http://www.faqs.org/rfcs/rfc1533.html and removing an incorrect Option 43 configuration from DHCP.