18
Sep

How to Manage Data Plane and Control Plane Synchronization | Intel Software


Hi, I’m MJay from Intel. In this video,
you will learn how avoid field outages
and issues that can arise from your conflict
of resource usage between SDN and NFV. How can you do this? The answer is effectively
managing data plane and control plane synchronization. I’ll explain how you can make
design decisions that’ll not only help you succeed in
the production and test phase, but also in the field. In the field, when met
with the real traffic mix, the system can
potentially face outages that can be expensive to debug. You will save money,
time, and manpower by watching and following
the strategic guidance given in this video. NFV is nothing but
virtualized building blocks that are chained together to
create communication services. SDN controls how this
chaining is done. While NFV does the real work,
SDN orchestrates and controls. SDN and NFV partitioning
of network infrastructure requires appropriate assignments
of NIC ports to system cores. Prior to introduction of
SDN or NFV archtiecture, control functionality
was distributed among the switches and NICs But now, with simple and
faster NICs or switches, control is managed by
the SDN controller. System designer tend to
blindly partition the NIC or switch such that
certain ports carry data plane traffic and other
ports carry control traffic. Let us see why that
is not workable and talk about the
recommended solutions that you should follow. Why is simply splitting a NIC
or switch at the port level not a workable solution? Because modern NICs are complex,
and they share common logic among ports. If you split ports and assign
some to control and some to data, each can
program the NIC oblivious of the other modules’ presence. Each may operate
on different ports, but since the NIC logic is
common among all the ports, SDN and NFV applications might
program that common logic differently,
leaving the hardware in an unspecified state. This can lead to
outages in network VNFs. So how do you
solve this problem? Use the flow bifurcated
model, shown here, to separate the traffic
between control and data. This way, your usage model is
in alignment with the design and scope of the
hardware, and you have avoided modules stepping
on each other’s toes. What if your use case requires
you to share the NIC ports? In that case, as of
version 18.05 of the DPDK, you will need to
install the four patches for multi-driver
support in the provided links. We have talked about
managing ports. Now let’s talk about cores. As the NFVI builder, you must
manage isolation of cores. The master core deals with
the OS and control plane. DPDK cores deal with packet
processing or data plane. Each has different
characteristics and needs different handling. We do this by pinning the master
core to the OS and isolate DPDK cores from the OS, interrupts,
kernel level threads, and user level threads. Thanks for watching. For details on how to configure
ports and cores for SDN and NFVI, read the companion
article “DPDK Data Plane, Multi-Cores and Control
Plane Synchronization” provided in the links.

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