Enabling the DHCP relay agent to record relay entries

Perform this task to enable the DHCP relay agent to automatically record clients' IP-to-MAC bindings (relay entries) after they obtain IP addresses through DHCP.

Some security features use the relay entries to check incoming packets and block packets that do not match any entry. In this way, illegal hosts are not able to access external networks through the relay agent. Examples of the security features are ARP address check, authorized ARP, and IP source guard.

To enable the DHCP relay agent to record relay entries:

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enable the relay agent to record relay entries.

dhcp relay client-information record

By default, the relay agent does not record relay entries.