Dynamic IPv4SG using DHCP relay agent configuration example

As shown in Figure 116, DHCP relay agent is enabled on the switch. The host obtains an IP address from the DHCP server through the DHCP relay agent.

Enable dynamic IPv4SG on VLAN-interface 100 to filter incoming packets by using the IPv4SG bindings generated based on DHCP relay entries.

1. Configure dynamic IPv4SG:

   # Configure IP addresses for the interfaces. (Details not shown.)

   # Enable IPv4SG on VLAN-interface 100 and verify the source IP address and MAC address for dynamic IPSG.

   <Switch> system-view
   [Switch] interface vlan-interface 100
   [Switch-Vlan-interface100] ip verify source ip-address mac-address
   [Switch-Vlan-interface100] quit
   

2. Configure the DHCP relay agent:

   # Enable the DHCP service.

   [Switch] dhcp enable
   

   # Enable recording DHCP relay client entries.

   [Switch] dhcp relay client-information record
   

   # Configure VLAN-interface 100 to operate in DHCP relay mode.

   [Switch] interface vlan-interface 100
   [Switch-Vlan-interface100] dhcp select relay
   

   # Specify the IP address of the DHCP server.

   [Switch-Vlan-interface100] dhcp relay server-address 10.1.1.1
   [Switch-Vlan-interface100] quit
   

# Verify that a dynamic IPv4SG binding is generated based on a DHCP relay entry.

[Switch] display ip source binding dhcp-relay
Total entries found: 1
IP Address      MAC Address    Interface                VLAN Type
192.168.0.1     0001-0203-0406 Vlan100                  100  DHCP relay