Monitoring DHCP Services
Purpose
A switch can operate as a DHCP server. When it is a
DHCP server, use the monitoring functionality to view information
about dynamic and static DHCP leases, conflicts, pools, and statistics.
Action
To monitor the DHCP server in the J-Web interface, select Monitor>Services >DHCP.
To monitor the DHCP server in the CLI, enter the following CLI
commands:
- show system services dhcp binding
- show system services dhcp conflict
- show system services dhcp pool
- show system services dhcp statistics
Meaning
Table 1 summarizes the output fields in DHCP displays.
Table 1: Summary of DHCP Output Fields
Field
|
Values
|
Additional Information
|
| Global Tab |
Name
|
This column displays the following information:
- Boot lease length
- Domain Name
- Name servers
- Server identifier
- Domain search
- Gateway routers
- WINS server
- Boot file
- Boot server
- Default lease time
- Minimum lease time
- Maximum lease time
|
|
Value
|
Displays the value for each of the parameters
in the Name column.
|
|
| Bindings tab
|
Allocated Address
|
List of IP addresses the DHCP server has assigned
to clients.
|
|
MAC Address
|
Corresponding media access control (MAC) address
of the client.
|
|
Binding Type
|
Type of binding assigned to the client: dynamic or static.
|
DHCP servers can assign a dynamic binding from a pool of IP addresses or a static binding
to one or more specific IP addresses.
|
Lease Expires
|
Date and time the lease expires, or never for leases that do not expire.
|
|
| Pools Tab
|
Pool Name
|
Subnet on which the IP address pool is defined.
|
|
Low Address
|
Lowest address in the IP address pool.
|
|
High Address
|
Highest address in the IP address pool.
|
|
Excluded Addresses
|
Addresses excluded from the address pool.
|
|
| Conflicts Tab |
Detection Time
|
Date and time the client detected the conflict.
|
|
Detection Method
|
How the conflict was detected.
|
Only client-detected conflicts are displayed.
|
Address
|
IP address where the conflict occurs.
|
The addresses in the conflicts list remain
excluded until you use the clear system services dhcp conflict command to manually clear the list.
|
| DHCP Statistics
|
Relay Statistics tab
|
Packet Counters
|
Displays the number of packet counters.
|
|
Dropped Packet Counters
|
Graphically displays the number of dropped
packet counters.
|
|
Statistics tab
|
Packets dropped
|
Total number of packets dropped and the number
of packets dropped due to a particular condition.
|
|
Messages received
|
Number of BOOTREQUEST, DHCPDECLINE, DHCPDISCOVER,
DHCPINFORM, DHCPRELEASE, and DHCPREQUEST messages sent from DHCP clients
and received by the DHCP server.
|
|
Messages sent
|
Number of BOOTREPLY, DHCPACK, DHCPOFFER, and
DHCPNAK messages sent from the DHCP server to DHCP clients.
|
|
Published: 2009-07-28
