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Configuring Multiple VRF
-> qos policy condition c1 vrf engr_vrf
-> qos policy condition c2 vrf default
-> qos policy condition c1 no vrf
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VRF policies are configured in the default VRF, similar to how all other QoS policies are configured.
If the VRF name specified does not exist, the policy is not allocated any system resources.
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Policies that do not specify a VRF name are considered global policies and are applied across all VRF
instances and VLANs.
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Policies that specify the default VRF apply only to traffic in the default VRF instance.
•
Policies that specify a VRF name apply only to traffic in the VRF instance associated with that name.
•
The switch network group is supported only in VRF policies that specify the default VRF instance. If
this group is specified in a global policy (no VRF specified) then the policy is applied across all VRF
instances.
SNMP
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SNMPv3 is required to manage VRF instances; SNMPv1 and v2 are not supported.
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Configuring the management station to use SNMPv3 is required to receive traps from VRF-aware
applications.
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
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:
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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.
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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
OmniSwitch AOS Release 7 Network Configuration Guide
"Assigning IP Interfaces to a VRF Instance" on page 12-14
March 2011
VRF Interaction With Other Features
page 12-11
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