Alcatel-Lucent 6850-48 Network Guide

VRF Interaction With Other Features

Configuring Multiple VRF

page 25-12

OmniSwitch AOS Release 6 Network Configuration Guide

Use the following table to determine which UDP/DHCP Relay commands are VRF-aware, global, and 
default VRF commands:

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 

• The DHCP per-VLAN mode is only supported in the default VRF instance. As a result, DHCP Relay 

operates only in the standard mode in all other VRF instances.

• 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 configura-
tion previously associated with that name is not restored.