Monitoring The Dhcp Process - HP ProCurve 7000dl Series Basic Management And Configuration Manual

Dynamic Host Configuration Protocol (DHCP)
Managing and Troubleshooting the DHCP Server
C a u t i o n
13-20
ProCurveSR7102dl# show ip dhcp-server binding
IP Address Client Id
172.16.1.4 01:00:50:04:91:ee:19
172.16.2.28 01:00:01:02:51:c9:f6
172.16.1.7 01:00:10:4b:a0:df:0a
Client's MAC address
Figure 13-5. Viewing DHCP Clients Supported by the Router

Monitoring the DHCP Process

When troubleshooting a router's DHCP functions, it is often helpful to track
the DHCP process. (To review this process, refer to "DHCP Request Process"
on page 13-3.)
You can view DHCP messages as they arrive on the interface by entering:
ProCurve# debug ip dhcp-server
Debug messages can tie up the router's processor. Therefore, you should be
very cautious about using them in a live network. You should begin by
troubleshooting the host experiencing the problem and rule out a connectivity
problem.
In a large network, you should not use DHCP debug messages to fix a problem
for a single host. The router may be flooded with DHCP messages from other
hosts, and displaying them all could potentially compromise network
performance.
DHCP messages generally break down into the steps of the DHCP request
process. You can look for a message that repeats several times to determine
where the process begins to break down.
View Table 13-1 for a quick guide to what steps you should take when you see
a debug message repeat again and again.
Lease Expiration
Aug 27 2004 3:04 PM
Aug 27 2004 3:26 PM
Aug 27 2004 3:28 PM
User-selected name on the
computer or device
Client Name
HunterPC
ShanePC
TreyPC