On 09/01/2015 02:24 AM, Rob Shakir wrote:
Hi Robert,
On August 31, 2015 at 20:08:14, Robert Varga ([email protected]) wrote:
A picture speaks a thousand words. As someone largely ignorant of
routing operations, I have to ask, though: What is the value of having a
set of logical routers each containing a set of VRFs? Wouldn't a
structure having a 'global router' and a per-VRF logical router achieve
the same thing (purely from modeling perspective)?
We’re modelling two different things here. One is a physical system that we can
have run multiple logical systems (think a bare metal machine running multiple
VMs), and then the other is a logical separation of solely routing tables
within one of the logical systems (think Linux network namespaces).
There are N logical systems to each physical system, and M routing tables
(VRFs) to each logical system. A logical system might come with its own set of
protocol daemons, authentication etc., whereas a VRF typically would not.
Makes sense, thanks for making it clear. The set of logical systems is a
flattened list of the hierarchical reality (e.g. running VMs inside a
VM), with some additional metadata to express how logical systems relate
to each other from containment perspective.
Bye,
Robert
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