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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Debugging DHCP Client Operation

To enable debug messages for DHCP client operation, enter the following debug commands:

  • Enable the display of log messages for all DHCP packets sent and received on DHCP client interfaces. EXEC Privilege [no] debug ip dhcp client packets [interface type slot/port ]
  • Enable the display of log messages for the following events on DHCP client interfaces: IP address acquisition, IP address release, Renewal of IP address and lease time, and Release of an IP address. EXEC Privilege [no] debug ip dhcp client events [interface type slot/port ]
The following example shows the packet- and event-level debug messages displayed for the packet transmissions and state transitions on a DHCP client interface.

DHCP Client: Debug Messages Logged during DHCP Client Enabling/Disabling 

                                 Dell (conf-if-Ma-0/0)# ip address dhcp
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :DHCP ENABLE 
                                 CMD
                                 Received in state START
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :Transitioned 
                                 to state SELECTING
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:  DHCP DISCOVER sent in 
                                 Interface
                                 Ma 0/0
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:  Received DHCPOFFER packet in
                                 Interface Ma 0/0 with Lease-ip:10.16.134.250, Mask:255.255.0.0,Server-Id:10.16.134.249
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :Transitioned 
                                 to state REQUESTING
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:DHCP REQUEST sent in Interface
                                 Ma 0/0
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:Received DHCPACK packet in 
                                 Interface
                                 Ma 0/0 with Lease-IP:10.16.134.250, Mask:255.255.0.0,DHCP REQUEST sent in Interface Ma 0/0
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :Transitioned 
                                 to state BOUND
                                 
                                 
                                 
                                 Dell(conf-if-ma-0/0)# no ip address
                                 Dell(conf-if-ma-0/0)#1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface
                                 Ma 0/0 :DHCP DISABLE CMD Received in state SELECTING
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :Transitioned 
                                 to state START
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :DHCP DISABLED 
                                 CMD
                                 sent to FTOS in state START
                                 
                                 
                                 
                                 Dell# release dhcp int Ma 0/0
                                 Dell#1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :DHCP 
                                 RELEASE
                                 CMD Received in state BOUND
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT: DHCP RELEASE sent in Interface
                                 Ma 0/0
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :Transitioned 
                                 to state STOPPED
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :DHCP IP 
                                 RELEASED
                                 CMD sent to FTOS in state STOPPED
                                 
                                 Dell# renew dhcp int Ma 0/0
                                 Dell#1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :DHCP 
                                 RENEW
                                 CMD Received in state STOPPED
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :Transitioned 
                                 to state SELECTING
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT: DHCP DISCOVER sent in Interface
                                 Ma 0/0
                                 1w2d23h: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT: Received DHCPOFFER packet in
                                 Interface Ma 0/0 with Lease-Ip:10.16.134.250, Mask:255.255.0.0,Server-Id:10.16.134.249

The following example shows the packet- and event-level debug messages displayed for the packet transmissions and state transitions on a DHCP client interface when you release and renew a DHCP client.

DHCP Client: Debug Messages Logged during DHCP Client Release/Renew 

                                 Dell# release dhcp interface managementethernet 0/0
                                 May 27 15:55:22: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :
                                 DHCP RELEASE CMD Received in state BOUND
                                 May 27 15:55:22: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:
                                 DHCP RELEASE sent in Interface Ma 0/0
                                 May 27 15:55:22: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :
                                 Transitioned to state STOPPED
                                 May 27 15:55:22: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :
                                 DHCP IP RELEASED CMD sent to FTOS in state STOPPED
                                 
                                 
                                 
                                 Dell# renew dhcp interface tengigabitethernet 0/1
                                 Dell#May 27 15:55:28: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :
                                 DHCP RENEW CMD Received in state STOPPED
                                 May 27 15:55:31: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_EVT: Interface Ma 0/0 :
                                 Transitioned to state SELECTING
                                 May 27 15:55:31: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:
                                 DHCP DISCOVER sent in Interface Ma 0/0
                                 May 27 15:55:31: %STKUNIT0-M:CP %DHCLIENT-5-DHCLIENT-LOG: DHCLIENT_DBG_PKT:
                                 Received DHCPOFFER packet in Interface Ma 0/0 with Lease-Ip:10.16.134.250,
                                 Mask:255.255.0.0,Server-Id:10.16.134.249

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