Monitoring Dhcp Client Activity - HP ProCurve 7000dl Series Basic Management And Configuration Manual

Dynamic Host Configuration Protocol (DHCP)
Managing and Troubleshooting the DHCP Client
C a u t i o n
13-30

Monitoring DHCP Client Activity

If the interface will not take a dynamic address, you should track the DHCP
request process to determine what is going wrong. (For more information on
this process, refer to "DHCP Request Process" on page 13-3.)
To view real-time DHCP client messages, enter:
ProCurve# debug ip dhcp-client
Debug messages can tie up the router's processor and compromise the net-
work's functions. Therefore, you should take care when using them with active
networks.
Before you run debug messages, you should verify that the interface is up and
double-check your client ID.
Scan the debug messages. The interface should produce debug messages such
as those shown in Figure 13-7:
ProCurve# debug ip dhcp-client
2005.07.08 19:15:23 DHCP.CLIENT Loading timer 1 with 1 seconds
2005.07.08 19:15:23 DHCP.CLIENT Loading timer 2 with 3
2005.07.08 19:15:24 DHCP.CLIENT Timer 1 Expired
2005.07.08 19:15:24 DHCP.CLIENT Sending Discover Message: Xid =
34681764
2005.07.08 19:15:24 DHCP.CLIENT Loading timer 1 with 3 seconds
2005.07.08 19:15:24 DHCP.CLIENT Current State = Selecting
2005.07.08 19:15:25 DHCP.CLIENT Processing Offer Message: Xid =
34681764
2005.07.08 19:15:25 DHCP.CLIENT Sending Request Message: Xid = 34681764
2005.07.08 19:15:25 DHCP.CLIENT Loading timer 1 with 2 seconds
2005.07.08 19:15:25 DHCP.CLIENT Current State = Requesting
2005.07.08 19:15:25 DHCP.CLIENT Processing Ack Message: Xid = 34681764
2005.07.08 19:15:25 DHCP.CLIENT Loading timer 1 with 43200 seconds
2005.07.08 19:15:25 DHCP.CLIENT Loading timer 2 with 64800 seconds
2005.07.08 19:15:25 DHCP.CLIENT Current State = Bound
Figure 13-7. An Interface Successfully Receiving a Dynamic Address
When the DHCP client's state is "Bound," the interface has received the
address. The client sets two timers, which expire before the lease does. When
these timers expire, the client requests to keep its address.