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Embed code for: 21.5 Monitoring DHCP Server Functions
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21.5 Monitoring DHCP Server Functions
Monitoring DHCP Server Functions Section 21: DHCP and Cisco IOS Software You can use the show ip dhcp pool command in privileged EXEC mode to verify configured DHCP parameters. As shown in the example output below, this command displays the total number of addresses in the pool, the configured address range for the pool, and the number of addresses in the pool that are currently leased. R1#show ip dhcp pool Pool Guests : Utilization mark (high/low) : 100 / 0 Subnet size (first/next) : 0 / 0 Total addresses : 254 Leased addresses : 2 Pending event : none 1 subnet is currently in the pool : Current index IP address range Leased addresses 10.1.50.55 10.1.50.1 - 10.1.50.254 2 To verify the operation of a DHCP server, use the show ip dhcp binding command. As shown in the example output below, this command displays a list of all IPaddressto MACaddress bindings that have been provided by the DHCP service. The command output also displays the lease expiration date and time. R1#show ip dhcp binding Bindings from all pools not associated with VRF: IP address Client-ID/ Lease expiration Type Hardware address/ User name 10.1.50.54 0100.0c29.8807.34 Oct 18 2013 06:56 PM Automatic 10.1.50.56 0100.0c29.4532.be Oct 18 2013 07:08 PM Automatic Before assigning an IP address to a host, DHCP uses ping and GARP to determine if another host is already using the address. If it discovers that the address is already in use, the address is removed from the DHCP address pool and will not be assigned until you resolve the conflict. This is because assigning an address that is already in use to a second host would produce an address conflict, a situation that typically renders one or both of the hosts unable to communicate on the network. You can use the show ip dhcp conflict command in privileged EXEC mode to display address conflicts that have been detected. As shown in the example below, the command output shows (for each conflicting IP address) how the conflict was detected, the time when it was detected, and the detection method. You can clear conflicting IP addresses by issuing the clear ip dhcp conflict command in privileged EXEC mode. R1#show ip dhcp conflict IP address Detection method Detection time VRF 10.1.50.52 Gratuitous ARP Oct 18 2012 06:56 AM 10.1.50.53 Ping Oct 18 2012 07:08 AM Up Next: Extended Discovery