Prerequisites
- The parent tier-0 gateway needs to be created before the tier-0 VRF gateway instance.
- The parent tier-0 gateway needs to have an external interface before you create an external interface on the tier-0 VRF gateway.
- VLAN tagging (802.1q) is used to differentiate traffic among VRFs. The external interface on tier-0 VRF gateway needs to be connected to a trunk segment with the corresponding access VLAN ID defined in the segment VLAN range.