Showing DHCP Status

2017-11-03 09:05:05

Problem

You want to display the status of the DHCP server functions on the router.

Solution

To display the IP address bindings and their associated leases, use the following command:

Router1#show ip dhcp binding

The following command displays any IP address conflicts that the router has detected in the DHCP address pool:

Router1#show ip dhcp conflict

You can view the status of remote database backups with this command:

Router1#show ip dhcp database

And you can see the global DHCP server statistics like this:

Router1#show ip dhcp server statistics

Discussion

To display the status of the DHCP service, use the show ip dhcp EXEC command. If you add the keyword binding, this command displays the current DHCP bindings, which include the assigned IP addresses, the associated client MAC addresses, and the lease expiration time:

Router1#show ip dhcp binding IP address Hardware address Lease expiration Type 172.25.1.51 0100.0103.85e9.87 Apr 10 2006 08:55 PM Automatic 172.25.1.52 0100.50da.2a5e.a2 Apr 10 2006 09:00 PM Automatic 172.25.1.53 0100.0103.ea1b.ed Apr 10 2006 08:58 PM Automatic Router1#

To view the IP addresses that are currently in conflict, use the conflict keyword. This command displays all of the IP addresses that the router has discovered conflicts for, and how the conflict was discovered:

Router1#show ip dhcp conflict IP address Detection method Detection time 172.25.1.51 Ping Apr 09 2006 09:08 PM 172.25.1.54 Gratuitous ARP Apr 09 2006 10:00 PM Router1#

With the database keyword, you can view the database configuration and status. This command shows all of the configured remote database servers and the current read and write status reports:

Router1#show ip dhcp database URL : ftp://dhcp:bindsave@172.25.1.1/dhcp-leases Read : Never Written : Apr 09 2006 10:24 PM Status : Last write succeeded. Agent information is up-to-date. Delay : 300 seconds Timeout : 300 seconds Failures : 1 Successes: 30 Router1#

Finally, the statistics keyword lets you view the overall DHCP statistics:

Router1#show ip dhcp server statistics Memory usage 17996 Address pools 4 Database agents 1 Automatic bindings 2 Manual bindings 1 Expired bindings 3 Malformed messages 0 Message Received BOOTREQUEST 0 DHCPDISCOVER 63 DHCPREQUEST 203 DHCPDECLINE 1 DHCPRELEASE 27 DHCPINFORM 19 Message Sent BOOTREPLY 0 DHCPOFFER 63 DHCPACK 139 DHCPNAK 2 Router1#

This command displays the high-level DHCP statistics, including the number of bindings, address pools, as well as the number of sent and received messages.

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