Some time ago I wroteA simple example Cisco routers DHCP and DHCP relay configuration，Article uses a command to achieve theDHCP forwarding，But this function is exactly how to achieve it? Now let's learn more about this command。
When the terminal equipment andDHCP serverWhen not on the same broadcast domain，Intermediate devices need to specify an address to be broadcast packet forwarded out，That needs to be sethelper_add[……]