57
[SwitchA-dhcp-pool-2] expired day 5
[SwitchA-dhcp-pool-2] domain-name aabbcc.com
[SwitchA-dhcp-pool-2] dns-list 10.1.1.2
[SwitchA-dhcp-pool-2] gateway-list 10.1.1.254
[SwitchA-dhcp-pool-2] quit
# Enable DHCP.
[SwitchA] dhcp enable
# Enable the DHCP server on VLAN-interface 10 and VLAN-interface 20.
[SwitchA] interface vlan-interface 10
[SwitchA-Vlan-interface10] dhcp select server
[SwitchA-Vlan-interface10] quit
[SwitchA] interface vlan-interface 20
[SwitchA-Vlan-interface20] dhcp select server
[SwitchA-Vlan-interface20] quit
Verifying the configuration
# Verify that clients on subnets 10.1.1.0/25 and 10.1.1.128/25 can obtain correct IP addresses and
all other network parameters from Switch A. (Details not shown.)
# On the DHCP server, display the IP addresses assigned to the clients.
[SwitchA] display dhcp server ip-in-use
IP address Client identifier/ Lease expiration Type
Hardware address
10.1.1.3 0031-3865-392e-6262- Jan 14 22:25:03 2015 Auto(C)
3363-2e30-3230-352d-
4745-302f-30
10.1.1.5 0031-fe65-4203-7e02- Jan 14 22:25:03 2015 Auto(C)
3063-5b30-3230-4702-
620e-712f-5e
10.1.1.130 3030-3030-2e30-3030- Jan 9 10:45:11 2015 Auto(C)
662e-3030-3033-2d45-
7568-6572-1e
10.1.1.131 3030-0020-fe02-3020- Jan 9 10:45:11 2015 Auto(C)
7052-0201-2013-1e02
0201-9068-23
10.1.1.132 2020-1220-1102-3021- Jan 9 10:45:11 2015 Auto(C)
7e52-0211-2025-3402
0201-9068-9a
10.1.1.133 2021-d012-0202-4221- Jan 9 10:45:11 2015 Auto(C)
8852-0203-2022-55e0
3921-0104-31
Example: Configuring DHCP user class
Network requirement
As shown in Figure 19, the DHCP relay agent (Switch A) forwards DHCP packets between DHCP
clients and the DHCP server (Switch B). Enable switch A to support Option 82 so that switch A can
add Option 82 in the DHCP requests sent by the DHCP clients.
Configure the address allocation scheme as follows:
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