Licensing Requirements For Vrfs; Guidelines And Limitations - Cisco Nexus 3000 Series Configuration Manual
Nx-os unicast routing configuration guide,
nx-os release 5.0(3)u1(1)
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Also See for Nexus 3000 Series:
- Command reference manual (356 pages) ,
- Configuration manual (182 pages) ,
- Installation manual (112 pages)
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Chapter 9
Configuring Layer 3 Virtualization
S e n d d o c u m e n t c o m m e n t s t o n e x u s 3 k - d o c f e e d b a c k @ c i s c o . c o m
Licensing Requirements for VRFs
The following table shows the licensing requirements for this feature:
Product
License Requirement
Cisco NX-OS
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.
Guidelines and Limitations
VRFs have the following configuration guidelines and limitations:
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VRF-lite has the following guidelines and limitations:
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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.
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.
VRF-lite does not support all MPLS-VRF functionality; it does not support label exchange, LDP
adjacency, or labeled packets.
Multiple virtual Layer 3 interfaces can be connected to a VRF-lite switch.
The switch supports configuring a VRF by using physical ports, VLAN SVIs, or a combination of
both. The SVIs can be connected through an access port or a trunk port.
The Layer 3 TCAM resource is shared between all VRFs. To ensure that any one VRF has sufficient
CAM space, use the maximum routes command.
A switch using VRF can support one global network and up to 64 VRFs. The total number of routes
supported is limited by the size of the TCAM.
VRF-lite supports BGP, RIP, and static routing.
VRF-lite does not support EIGRP.
VRF-lite does not affect the packet switching rate.
Multicast cannot be configured on the same Layer 3 interface at the same time.
VRF-lite is supported only on an IPv4 network.
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
Licensing Requirements for VRFs
9-5
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