# Configuring Subscriber Management with an External DHCP Server

To configure subscriber management for clients by using an external DHCP server, as in Figure 15, use the following procedure on E Series routers:

1. Enable the DHCP external server application.
   host1(config)#service dhcp-external
2. Specify each DHCP server for which to monitor traffic. You can specify a maximum of four DHCP servers.
   host1(config)#ip dhcp-external server-address 10.10.10.1
3. Configure a default policy for subscribers, using a previously configured classifier group.
   host1(config)#ip policy-list filterAll host1(config-policy-list)#classifier-group filterGroupA host1(config-policy-list-classifier-group)#filter host1(config-policy-list-classifier-group)#exit host1(config-policy-list)#exit
4. Configure a dynamic subscriber interface policy.
   host1(config)#profile disableUser host1(config-profile)#ip policy input filterAll host1(config-profile)#ip policy output filterAll host1(config-profile)#exit
5. Configure a route map.
   host1(config)#route-map routeMapWest21 host1(config-route-map)#set ip interface-profile disableUser host1(config-route-map)#exit
6. Enable autoconfiguration mode.
   host1(config)#interface gigabitEthernet 12/0 host1(config-if)#ip address 192.168.1.1 255.255.255.0 host1(config-if)#ip auto-configure ip-subscriber include-primary host1(config-if)#ip route-map ip-subscriber routeMapWest21 host1(config-if)#ip auto-detect ip-subscriber host1(config-profile)#exit

#### Related Documentation

- Subscriber Management Procedure Overview
- ip policy
- ip policy-list
- route-map
- service dhcp-external
- set ip interface-profile