Virtualization Technologies Primer: Theory--Part II

The term global is used to refer to the routing instances and tables that are not in a VRF, as in "global routing table" or "global address space."

When discussing VRFs, it is common to hear questions about resource allocation, such as "how are router resources allocated between VRFs?" This is a natural question, even if it is not logical! There are no special rules to prioritize data from one VRF to be processed quicker than data from other VRFs. A VRF exists in the memory plane of a device, not in the scheduling plane, which is what per-VRF traffic prioritization would require.

Note
Creating a VRF does not automatically consume a significant amount of memory. However, the expectation is that you will add routes to the VRFs and in this case be careful that the sum of entries in the virtual routing tables does not exceed the capacity of the device. In truth, this is not much different from standard best practices governing route table size.

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