Cisco Nexus 7000 Series Configuration Manual page 372

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 7 k - d o c f e e d b a c k @ c i s c o . c o m .
Cisco NX-OS further virtualizes each VDC to support virtual routing and forwarding instances (VRFs). You
can configure multiple VRFs in a VDC. Each VRF contains a separate address space with unicast and
multicast route tables for IPv4 and IPv6 and makes routing decisions independent of any other VRF.
Figure 14-1
Figure 14-1
Physical Router
VDC 2
VRF B
RIBs
A VRF name is local to a VDC, so you can configure two VRFs with the same name if the VRFs exist
in different VDCs. In
Each router has a management VRF and a default VRF:
Management VRF
The management VRF is for management purposes only.
•
Only the mgmt 0 interface can be in the management VRF.
•
The mgmt 0 interface cannot be assigned to another VRF.
•
The mgmt 0 interface is shared among multiple VDCs.
•
No routing protocols can run in the management VRF (static only).
•
Default VRF
• All Layer 3 interfaces exist in the default VRF until they are assigned to another VRF.
• Routing protocols run in the default VRF context unless another VRF context is specified.
• The default VRF uses the default routing context for all show commands.
The default VRF is similar to the global routing table concept in Cisco IOS.
•
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
14-2
shows multiple independent VRFs in two different VDCs.
Multiple VRFs in VDCs
routing protocol x
VRF A
routing protocol y
VRF A VRF B
Protocol stack
VDC 2 VRF A
FIBs
Figure 14-1, VRF A in VDC 2 is independent of VRF B and VRF A in VDC n.
VDC n
routing protocol
VRF A
RIBs
VRF A
Protocol stack
VRF B VDC n VRF A
Infrastructures
kernel
Chapter 14 Configuring Layer 3 Virtualization
VRF B
VRF B
VRF B
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