Specifications

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11-5
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
Chapter 11 Configuring Layer 3 Virtualization
Licensing Requirements for VRFs
Figure 11-4 shows an SNMP server that is reachable on the management VRF. You can configure the
SNMP server to support only the SNMP notifications from VRF Red, for example.
Figure 11-4 Service VRF Reachability Filtering
Licensing Requirements for VRFs
The following table shows the licensing requirements for this feature:
Guidelines and Limitations
VRFs have the following configuration guidelines and limitations:
• When you make an interface a member of an existing VRF, Cisco NX-OS removes all Layer 3
configuration. You should configure all Layer 3 parameters after adding an interface to a VRF.
• You should add the mgmt0 interface to the management VRF and configure the mgmt0 IP address
and other parameters after you add it to the management VRF.
• If you configure an interface for a VRF before the VRF exists, the interface is operationally down
until you create the VRF.
• Cisco NX-OS creates the default and management VRFs by default. You should make the mgmt0
interface a member of the management VRF.
• The write erase boot command does not remove the management VRF configuration. You must use
the write erase command and then the write erase boot command.
VRF-lite has the following guidelines and limitations:
• A switch with VRF-lite has a separate IP routing table for each VRF, which is separate from the
global routing table.
• Because VRF-lite uses different VRF tables, the same IP addresses can be reused. Overlapped IP
addresses are allowed in different VPNs.
186419
Router A
Ethernet 2/1
VRF Red
Ethernet 2/2
VRF Blue
Router B
Router C
mgmt0
VRF management
SNMP Server
192.0.2.1
Product License Requirement
Cisco NX-OS The default inband and outband management VRFs require no license. Any feature not included in a license
package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For a
complete explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide.
Cisco NX-OS VRF-lite requires an Enterprise services license. For a complete explanation of the Cisco NX-OS licensing
scheme, see the Cisco NX-OS Licensing Guide.