Dynamic Host Configuration Protocol (DHCP) relay is used to forward DHCP client’s broadcast request,DHCP Discover, from one VLAN to the DHCP server’s VLAN.  This request forwarding is done by the local router gateway of the DHCP client. The br…
http://www.ebrahma.com/2014/04/what-is-dhcp-relay-ip-helper-address/

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