419
The output shows that IP address 10.1.1.2 has been assigned to Switch B.
Switch B must use the IP address and MAC address in the authorized ARP entry to communicate
with Switch A. Otherwise, the communication fails. Thus user validity is ensured.
Configuration example (on a DHCP relay agent)
Network requirements
As shown in Figure 125, configure authorized ARP on GigabitEthernet 1/0/2 of Switch B (a DHCP
relay agent) to ensure user validity.
Figure 125 Network diagram
Configuration procedure
1. Configure Switch A:
# Specify the IP address for GigabitEthernet 1/0/1.
<SwitchA> system-view
[SwitchA] interface gigabitethernet 1/0/1
[SwitchA-GigabitEthernet1/0/1] port link-mode route
[SwitchA-GigabitEthernet1/0/1] ip address 10.1.1.1 24
[SwitchA-GigabitEthernet1/0/1] quit
# Configure DHCP.
[SwitchA] dhcp enable
[SwitchA] dhcp server ip-pool 1
[SwitchA-dhcp-pool-1] network 10.10.1.0 mask 255.255.255.0
[SwitchA-dhcp-pool-1] gateway-list 10.10.1.1
[SwitchA-dhcp-pool-1] quit
[SwitchA] ip route-static 10.10.1.0 24 10.1.1.2
2. Configure Switch B:
# Enable DHCP.
<SwitchB> system-view
[SwitchB] dhcp enable
# Specify the IP addresses of GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2.
[SwitchB] interface gigabitethernet 1/0/1
[SwitchB-GigabitEthernet1/0/1] port link-mode route
[SwitchB-GigabitEthernet1/0/1] ip address 10.1.1.2 24
[SwitchB-GigabitEthernet1/0/1] quit
[SwitchB] interface gigabitethernet 1/0/2
[SwitchB-GigabitEthernet1/0/2] port link-mode route
[SwitchB-GigabitEthernet1/0/2] ip address 10.10.1.1 24
DHCP client
DHCP server
Switch A Switch C
GE1/0/1
10.1.1.1/24
GE1/0/2
DHCP relay agent
Switch B
GE1/0/1
10.1.1.2/24
GE1/0/2
10.10.1.1/24
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