Monitoring DHCP Traffic Between Remote Clients and DHCP Servers
You can configure the router to monitor DHCP packets between remote clients and specified DHCP servers. You can specify up to four DHCP servers.
To monitor DHCP packets between remote clients and a DHCP server:
host1(config)#ip dhcp-external server-address 10.10.10.1host1(config)#ip dhcp-external server-address 10.20.10.1