Vlans - OmniSwitch os6900 Network Configuration Manual

Configuring VRF Instances

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
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 configura-
tion previously associated with that name is not restored.
Configuring VRF Instances
Configuring the Multiple VRF feature consists of the following:
•
Creating a VRF instance with a low profile or the default max profile.
•
Assigning one or more IP interfaces to the instance.
•
Configuring routing protocols to operate within a specific instance.
The initial configuration of an Alcatel-Lucent switch consists of a default VRF instance, which is always
active when the switch starts up and is not removable from the switch configuration. Any subsequent
configuration of switch applications applies only to the default instance. To provide multiple, independent
IP routing domains on the same switch, configuring additional VRF instances is required.
The VRF CLI is context-based in that commands used to configure VRF-aware applications are applied to
the active VRF instance. A VRF instance becomes active when the instance is either created or selected
using the vrf command.
A VRF instance is identified by a name, which is specified at the time the instance is configured. For
example, the following command creates the IpOne instance:
page 16-14
"Assigning IP Interfaces to a VRF Instance" on page 16-17
OmniSwitch AOS Release 7 Network Configuration Guide
Configuring Multiple VRF
for
June 2013