Configuring Multiple VRF VRF Interaction With Other Features
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 16-14
VLANs
Configuring an interface for a VLAN also associates that VLAN with the active VRF context. A VLAN,
however, can only belong to one VRF instance at a time. As a result, all interfaces configured for a VLAN
must belong to the same VRF instance. See “Assigning IP Interfaces to a VRF Instance” on page 16-17
for more information.
UDP/DHCP Relay
VRF support for UDP/DHCP Relay allows for the configuration and management of relay agents and
servers within the context of a VRF instance.
The following guidelines apply when configuring UDP/DHCP Relay within the context of VRF instances:
• A separate DHCP server is required for each VRF instance to which DHCP packets are relayed to and
from the server. The server should reside in the same VRF as the originating requests. For example, the
following command configures the DHCP server address for the vrfOne instance:
-> vrf vrfOne
vrfOne:> ip helper address 10.0.0.1
The above configuration relays all DHCP packets within the vrfOne instance to the specified server
which also resides in the vrfOne instance.
• A separate UDP relay setting for port/service to VLAN is required per VRF instance. For example, the
following command configures the forwarding of specific UDP packets to VLAN 100 within the
context of the vrfTwo instance:
-> ip udp dns vlan 100
• When a VRF instance is deleted, all UDP/DHCP Relay configuration associated with that instance is
also deleted. However, if the VRF instance is created again with the same name, the relay
configuration previously associated with that name is not restored.
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