Concept Guide
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
DHCP Client
An Aggregator is auto-congured to operate as a DHCP client. The DHCP client functionality is enabled only on the default VLAN and the
management interface.
A DHCP client is a network device that requests an IP address and conguration parameters from a DHCP server. On an Aggregator, the
DHCP client functionality is implemented as follows:
• The public out-of-band management (OOB) interface and default VLAN 1 are congured, by default, as a DHCP client to acquire a
dynamic IP address from a DHCP server.
You can override the DHCP-assigned address on the OOB management interface by manually conguring an IP address using the CLI
or CMC interface. If no user-congured IP address exists for the OOB interface exists and if the OOB IP address is not in the startup
conguration, the Aggregator will automatically obtain it using DHCP.
You can also manually congure an IP address for the VLAN 1 default management interface using the CLI. If no user-congured IP
address exists for the default VLAN management interface exists and if the default VLAN IP address is not in the startup conguration,
the Aggregator will automatically obtain it using DHCP.
• The default VLAN 1 with all ports congured as members is the only L3 interface on the Aggregator. When the default management
VLAN has a DHCP-assigned address and you recongure the default VLAN ID number, the Aggregator:
– Sends a DHCP release to the DHCP server to release the IP address.
– Sends a DHCP request to obtain a new IP address. The IP address assigned by the DHCP server is used for the new default
management VLAN.
How DHCP Client is Implemented
The Aggregator is enabled by default to receive DHCP server-assigned dynamic IP addresses on an interface. This setting persists after a
switch reboot. If you enter the shutdown command on the interface, DHCP transactions are stopped and the dynamically-acquired IP
address is saved. Use the show interface type slot/port command to display the dynamic IP address and DHCP as the mode of
Dynamic Host
Conguration Protocol (DHCP) 281