A DHCP relay agent is any host that forwards DHCP packets between clients and servers. In SmartFabric DellEMC OS10, DHCP relay agents forward a DHCP client packet with the source IP address set to the IP address of the outgoing interface of the DHCP server. This feature provides the capability to configure the source IP address for the DHCP requests.
The DHCPv6 relay agent source-interface configuration supports the following interface types:
ethernet
loopback
port-channel
VLAN
virtual-network
Restrictions and limitations
The following restrictions and limitations apply to this feature:
The DHCPv6 relay agent source-interface configuration is supported at the interface level. SmartFabric DellEMC OS10 recommends that the specified source interface should belong to the server connected interface VRF.
SmartFabric DellEMC OS10 recommends to configure different source interface IP addresses in VLT peers. Synchronization for DHCPv6 functionality across VLT peers is not supported.
The DHCPv6 relay agent source-interface configuration is not supported at the VRF level when applied in batch mode. The IP VRF context appears at the beginning of running configuration file even before the loopback interface is configured. As a result, the IP VRF configurations fail to execute as the loopback interfaces do not exist. This behavior is similar to the update-source interface configuration command.
Impact on software upgrade and downgrade
NOTE The existing IPv4 source interface is used to fill relay agent gateway IP address. After upgrade, the same IPv4 source interface is used to fill the relay agent gateway IP address along with the source IP header.
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